Dr
Maxim Shayduk
(IRFU, Saclay)
01/08/2015, 15:30
GA-IN
Poster contribution
One of the constrains for the instruments with large number of readout channels is the cost of a complex data acquisition (DAQ) system. We suggest here the novel approach - the Long Buffer ReadOut System (LiBROS).
The LiBROS comprises the trigger, based on Field-Programmable-Gate-Array (FPGA) and the readout system based on Flash Analog-To-Digital Converters (FADCs). The readout channel...
Dr
Maxim Shayduk
(IRFU, Saclay)
01/08/2015, 15:30
GA-IN
Poster contribution
The energy range >100 TeV is of central importance for high-energy astrophysics. PeV accelerators are expected to produce also copious photons of about a decade less in energy. Thus registering gamma-rays with energies above 100 TeV will pinpoint the galactic sources able to accelerate particles up to PeV energies (so-called PeVatrons).
We suggest a concept of a novel wide-angle imaging...
Alison Mitchell
(Max-Planck-Institut für Kernphysik)
01/08/2015, 15:30
GA-EX
Poster contribution
Muons produced in extensive air showers generate ring-like images in Imaging Atmospheric Cherenkov Telescopes when travelling near parallel to the optical axis. From geometrical parameters of these images, the absolute amount of light emitted may be calculated analytically. Comparing the amount of light recorded in these images to expectation is a well established technique for telescope...
Dr
Robert Lauer
(University of New Mexico)
01/08/2015, 15:30
GA-IN
Poster contribution
The High Altitude Water Cherenkov (HAWC) Observatory continuously observes an instantaneous field of view of about 2 steradians above the array for gamma-rays between 100 GeV to 100 TeV. The large amount of raw data, the importance of small number statistics, the large dynamic range of gamma-ray signals in time (1 – 10^8 sec) and angular extent (0.1 – 100 degrees), and the growing need to...
Dr
Susumu Inoue
(Institute for Cosmic Ray Research, University of Tokyo)
01/08/2015, 15:30
GA-EX
Poster contribution
The Cherenkov Telescope Array (CTA), the new generation very high-energy gamma-ray observatory, will improve on the flux sensitivity of the current Cherenkov telescopes by an order of magnitude over a continuous range from about 10 GeV to above 100 TeV. With tens of telescopes distributed in the North and South hemispheres, the large effective area and field of view coupled with the fast...
Mr
Tim Holch
(Humboldt University Berlin)
01/08/2015, 15:30
GA-EX
Poster contribution
Data acquisition (DAQ) and control systems for arrays of Cherenkov telescopes comprise
hundreds of distributed software processes that implement the readout, control and monitoring
of various hardware devices. A multitude of different error conditions (malfunctioning
detector hardware, crashing software, failures of network and computing equipment etc.) can
occur and must be dealt with...
Ms
Susanne Raab
(ECAP, Universität Erlangen-Nürnberg)
01/08/2015, 15:30
GA-EX
Poster contribution
Skymaps measured with Imaging Atmospheric Cherenkov Telescopes (IACT) represent the real source distribution convolved with the point spread function of the observing instrument. Current IACTs have an angular resolution in the order of 0.1 degree which is rather large for the study of morphological structures and for comparing the morphology in $\gamma$-rays to measurements in other...
Michael Daniel
(University of Durham)
01/08/2015, 15:30
GA-IN
Poster contribution
The construction of the Cherenkov Telescope Array (CTA), consisting of two observatories designed to observe the very high energy gamma-ray sky with unprecedented sensitivity and precision, will soon start. We will present the baseline methods and their extensions currently foreseen to achieve the strong requirements on allowed systematic uncertainties for the reconstructed gamma-ray energy...
Elisa Prandini
(University of Geneva)
01/08/2015, 15:30
GA-IN
Poster contribution
The SST-1M telescope is one of the prototypes under construction proposed to be part of the future Cherenkov Telescope Array. It uses a standard Davis-Cotton design for the optics and telescope structure, with a dish diameter of 4 meters and a large field-of-view of 9 deg.
The innovative camera design is composed of a photo-detection plane with 1296 pixels including entrance window, light...
Dr
Antonio Bonardi
(Radboud University Nijmegen)
01/08/2015, 15:30
GA-IN
Poster contribution
The Cherenkov Telescope Array (CTA) is an international initiative to build the next generation ground based very-high energy gamma-ray observatory. It will consist of telescopes of three different sizes with several different technologies for the cameras that detect the Cherenkov light from the observed air showers. In order to ensure the compliance of each camera technology with CTA...
Teresa Montaruli
(Universite de Geneve (CH))
01/08/2015, 15:30
GA-IN
Poster contribution
The prototype camera of the single-mirror Small Size Telescopes (SST-1M) proposed for the Cherenkov Telescope Array (CTA) project was developed using large silicon photomultipliers (SiPM) coupled to hollow light concentrators.
The camera is composed of a silicon photo-sensor plane designed at the University of Geneva, and a readout and trigger system (DigiCam) developed in Krakow. The full...
Giovanni Lamanna
(Centre National de la Recherche Scientifique (FR))
01/08/2015, 15:30
GA-IN
Poster contribution
Very High Energy gamma-ray astronomy with the Cherenkov Telescope Array (CTA) is evolving towards the model of a public observatory. Handling, processing and archiving the large amount of data generated by the CTA instruments and delivering scientific products are some of the challenges in designing the CTA Data Management. The participation of scientists from within CTA Consortium and from...
Dr
Giovanni Lamanna
(Centre National de la Recherche Scientifique (FR))
01/08/2015, 15:30
GA-EX
Poster contribution
Rosette and Orion nebulae are two young massive star clusters in which no supernova explosion has occurred yet. That makes two very good candidates to study particle acceleration in a super bubble induces by the collective effects of stellar winds. Using data from Fermi-LAT and a phenomenological model, upper limits on the fraction of mechanical energy converted into accelerated particles have...
Mr
Andriy Petrashyk
(Columbia University)
01/08/2015, 15:30
GA-IN
Poster contribution
We present the final optical system design of the prototype Schwarzschild-Couder telescope (pSCT), for which construction is scheduled to begin in early fall at the Fred Lawrence Whipple Observatory in southern Arizona, USA. The Schwarzschild-Couder telescope is a candidate for a future extension of the Cherenkov Telescope Array. This novel aplanatic optical system design is made of two...
Emmanuel Moulin
(CEA)
01/08/2015, 15:30
GA-IN
Poster contribution
The NectarCAM is a camera proposed for the Medium-Size-Telescopes (MSTs) in the framework of the Cherenkov Telescope Arrray (CTA), the next-generation
observatory for high-energy gamma-ray astronomy. The cameras are designed to operate in an open environment and their mechanics must provide protection for all their components under the conditions defined for the CTA observatory. In order to...
Konstancja Satalecka
(Universidad Complutense de Madrid, Spain)
01/08/2015, 15:30
GA-IN
Poster contribution
The planned Cherenkov Telescope Array (CTA), a future ground-based Very-High-Energy (VHE) gamma-ray observatory, will be the largest Cherenkov project of its kind. It aims to provide an order of magnitude increase in sensitivity compared to currently operating VHE experiments and open access to guest observers. These features, together with the thirty years lifetime planned for the...
David Fidalgo
(UCM, Madrid, Spain)
01/08/2015, 15:30
GA-EX
Poster contribution
MAGIC is a system of two imaging atmospheric Cherenkov telescopes located on the Canary Island of La Palma. The fast processing of the data at the observation site plays an essential part in the operation of the telescopes and has continuously improved since the beginning of the experiment.
The on-site computing can be divided into three major contributions: the MAGIC online analysis (MOLA),...
Dr
Fulvio De Persio
(INFN Roma 1)
01/08/2015, 15:30
GA-IN
Poster contribution
Michael DuVernois
(University of Wisconsin)
01/08/2015, 15:30
GA-IN
Poster contribution
The High-Altitude Water Cherenkov (HAWC) observatory in central Mexico is currently the world's only synoptic survey instrument for gamma rays above 1 TeV. Because there is significant interest in covering the full TeV sky with a survey instrument, we have examined options for a Southern Hemisphere extension to HAWC. In addition to providing all-sky coverage of TeV sources, a southern site...
M. Ostrowski
(Astronomical Observatory, Jagiellonian University, ul. Orla 171, 30-244 Kraków, Poland)
01/08/2015, 15:30
GA-IN
Poster contribution
The SST-1M is one of three prototype small-sized telescope designs proposed for the Cherenkov Telescope Array, and is built by a consortium of Polish and Swiss institutions. The SST-1M will operate with DigiCam - an innovative, compact camera with fully digital read-out and trigger electronics. A high level of integration will be achieved by massively deploying state-of-the-art multigigabit...
Kazumasa Kawata
(ICRR, University of Tokyo)
01/08/2015, 15:30
GA-IN
Poster contribution
More than 100 gamma-ray sources have been detected by the Cherenkov telescopes in the energies from sub-TeV to multi-TeV. On the other hand, the extensive air shower (EAS) arrays, such as the Tibet air shower array, the ARGO-YBJ and the Milagro, have observed several gamma-ray sources with the wide field of view and higher energy threshold than the Cherenkov telescopes.
Aiming at 100 TeV...
Prof.
Shuwang Cui
(Hebei Normal University, China)
01/08/2015, 15:30
GA-IN
Poster contribution
The Large High Altitude Air Shower Observatory (LHAASO) project is a new generation instrument, which will be built at 4400m above sea level in Daocheng, Sichuan province, China. With a sensitivity of 10 mili-Crab, LHAASO will survey the northern sky in the declination band from -10° to 70° with a 100% duty cycle. With the wide field-of-view, LHAASO can observe not only the γ-ray point...
Peter Eger
(MPIK Heidelberg)
01/08/2015, 15:30
GA-EX
Poster contribution
The unidentified very high energy (VHE, E > 100 GeV) gamma-ray source HESS J1507-622 seems to not fit into standard models for sources related to young supernova remnants, pulsar wind nebulae, or young stellar populations in general. This is due to its intrinsically extended, but yet compact morphology, coupled with a relative large offset (3.5 deg) from the Galactic plane. Therefore, it has...
Mr
Fabian Temme
(TU Dortmund)
01/08/2015, 15:30
GA-EX
Poster contribution
The First G-APD Cherenkov Telescope (FACT) is an Imaging Air Cherenkov Telescope located on the Canary Island of La Palma. It is the first of its kind which uses Geigermode-Avalanche Photo Diodes (G-APDs) as photosensors to detect the Cherenkov radiation emitted from secondary particles in a high-energy gamma-ray air shower.
A new analysis chain was developed using modern data mining methods...
Fabian Temme
(TU Dortmund)
01/08/2015, 15:30
GA-EX
Poster contribution
The First G-APD Cherenkov Telescope (FACT) is an Imaging Air Cherenkov Telescope (IACT) located on the Canary Island of La Palma.
Its target is to provide long term monitoring of stellar objects like Active Galactic Nuclei.
FACT is the first IACT to use Silicon Photomultipliers instead of conventional PMTs.
Therefore studying the detector properties is especially important.
An event...
Dr
Riccardo Rando
(University of Padova & INFN Padova, Italy)
01/08/2015, 15:30
GA-IN
Poster contribution
The Cherenkov Telescope Array (CTA) is a future ground-based gamma-ray astronomy detector that will consist of several tens of
Imaging Atmospheric Cherenkov Telescopes of different sizes. The total reflective surface of roughly 10,000 m^2 requires unprecedented
technological efforts towards a cost-efficient production of light-weight and reliable mirror substrates at high production rate....
Dr
Anthony Brown
(Durham University)
01/08/2015, 15:30
GA-IN
Poster contribution
The GCT is a dual-mirror Small-Sized-Telescope (SST-2M) prototype proposed for the Cherenkov Telescope Array (CTA). Calibration of the GCT's camera is primarily achieved with LED-based flasher units capable of producing ~4 ns (FWHM) pulses of 400 nm light across a large dynamic range, from 0.1 up to 1000 pe. The flasher units are housed in the four corners of the camera's focal plane and...
Zigfried Hampel-Arias
(UW Madison)
01/08/2015, 15:30
GA-IN
Poster contribution
The High-Altitude Water Cherenkov (HAWC) Observatory is a ground based air shower array deployed on the slopes of Volcan Sierra Negra in the state of Puebla, Mexico. While HAWC is optimized for the detection of gamma-ray induced air showers, the background flux of hadronic cosmic-rays is 4 orders of magnitude greater, making background rejection paramount for gamma-ray observations. On...
Carlo Francesco Vigorito
(University & INFN Torino, Italy)
01/08/2015, 15:30
GA-IN
Poster contribution
The Cherenkov Telescope Array is a world wide project with the aim of exploring the highest energy region of the electromagnetic spectrum. With two arrays, one for each hemisphere, it will guarantee the full sky coverage in the energy range from few tens of GeV to hundreds of TeV, with improved angular resolution and a sensitivity in the TeV energy region better by one order of magnitude than...
Dr
Dirk Pandel
(Grand Valley State University)
01/08/2015, 15:30
GA-EX
Poster contribution
MGRO J1908+06 is a bright, extended TeV gamma-ray source located near the Galactic plane. The TeV emission has previously been attributed to the pulsar wind nebula (PWN) of the nearby Fermi-LAT pulsar PSR J1907+0602. However, studies of the TeV morphology with VERITAS have shown that MGRO J1908+06 is somewhat larger than other PWNe of a similar age and that the TeV spectrum does not soften...
Tarek Hassan
(GAE-UCM)
01/08/2015, 15:30
GA-IN
Poster contribution
The Cherenkov Telescope Array (CTA) is an international project for a next-generation ground-based gamma-ray observatory. CTA, conceived as an array of tens of imaging atmospheric Cherenkov telescopes, comprising small, medium and large-size telescopes, is aiming to improve on the sensitivity of current-generation experiments by an order of magnitude and provide energy coverage from 20 GeV to...
Mr
Gabriele Cologna
(LSW Heidelberg)
01/08/2015, 15:30
GA-EX
Poster contribution
The high-frequency peaked BL Lac object 1ES$\,$0229+200 (z$\,$=$\,$0.14) was first detected in very high energy (VHE, E$\,$>$\,$100$\,$GeV) $\gamma$-rays by the H.E.S.S. (High Energy Stereoscopic System) collaboration in 2006. No variability was reported in the source in the initial study and its spectral characteristics have been used to derive constraints on the extragalactic background...
Mr
Gernot Maier
(DESY)
01/08/2015, 15:30
GA-EX
Poster contribution
HESS J0632+057 is a X-ray binary, previously observed over six years with the Imaging Air Cherenkov Telescopes H.E.S.S., MAGIC, and VERITAS. New data taken in the last three years with the VERITAS observatory as part of its long-term observing plan are presented here. They cover the entire period of about 315 days including the enhancements at the phases of about 0.35 and, for the first time...
Dr
Xunxiu Zhou
(School of Physical Science and Technology, Southwest Jiaotong University)
01/08/2015, 15:30
GA-EX
Poster contribution
ARGO-YBJ, located at the YangBaJing Cosmic Ray Observatory (4300m a.s.l., Tibet, China), is a full coverage air shower array, with an energy threshold of about 300 GeV for gamma ray astronomy. Most of the recorded events are single showers, satisfying the trigger requirement of at least 20 particles detected in a given time window. However, in ~5% of the events, two randomly arriving showers...
Alessandro Carosi
(INAF-ASDC)
01/08/2015, 15:30
GA-EX
Poster contribution
The BL Lac object RBS 0723 is an extreme BL Lac object (EHBL) candidate. These sources are known to show an extreme frequency of their synchrotron and inverse Compton peaks in the spectral energy distribution (in the hard X-ray and TeV bands respectively). Furthermore, they are characterized by the extreme hardness of the UV-X-ray and intrinsic TeV continua. These characteristics are usually...
Ramin Marx
(MPIK)
01/08/2015, 15:30
GA-IN
Poster contribution
The Cherenkov Telescope Array (CTA) will be a ground-based gamma-ray observatory with full-sky coverage in the very-high energy (VHE) regime. It is proposed to consist of more than 100 telescopes and should produce large amounts of data. Apart from the impact on the storage system, this also imposes tight requirements on the software framework to ensure efficient and robust data processing and...
Xin Wu
(Universite de Geneve (CH))
01/08/2015, 15:30
GA-IN
Poster contribution
The Data Acquisition system (DAQ) of the future Cherenkov Telescope Array (CTA) must be efficient, modular and robust to be able to cope with the very large data rate of up to 100 GByte/s coming from many telescope with different characteristics. The use of modern middleware, namely zeroMQ and protocol buffers, helped to achieve these goals while keeping the development effort to a reasonable...
Mr
GERNOT Maier
(DESY)
01/08/2015, 15:30
GA-EX
Poster contribution
The Cherenkov Telescope Array (CTA) is the next-generation gamma-ray observatory with sensitivity in the energy range from ~20 GeV to beyond 300 TeV. CTA is proposed to consist of two arrays of 40-100 imaging atmospheric Cherenkov telescopes, with one site located in each of the Northern and Southern Hemispheres. The evaluation process for the candidates sites for CTA is supported by detailed...
Mr
Thomas Armstrong
(Dept. of Physics and Centre for Advanced Instrumentation, Durham University,UK)
01/08/2015, 15:30
GA-IN
Poster contribution
The Gamma-ray Cherenkov Telescope (GCT) is an innovative dual-mirror solution to the small-size telescopes
for CTA, capable of imaging the Cherenkov light produced in the atmosphere by cosmic gamma rays with energies
from a few TeV to hundreds of TeV. The reduced plate scale resulting from the secondary optics allows the use
of compact photosensors, including multi-anode photomultipliers...
Konstancja Satalecka
(UCM, Spain)
01/08/2015, 15:30
GA-EX
Poster contribution
More than one-third of the sources reported in the 1st and 2nd Fermi catalogs (1FGL and 2FGL) lack a clear association with a known astrophysical source, and are known as Unassociated Fermi Objects (UFOs).
We report MAGIC observations of three UFOs selected basing on their high energy spectral properties (e.g. hardness of the spectrum), as well as on additional multiwavelength information,...
Ramin Marx
(MPIK)
01/08/2015, 15:30
GA-IN
Poster contribution
The Cherenkov Telescope Array (CTA) is the next generation observatory for the study of very high-energy gamma rays from about 20 GeV up to 300 TeV.
Thanks to the large effective area and field of view, the CTA observatory will be characterized by an unprecedented sensitivity to transient flaring gamma-ray phenomena compared to both current ground (e.g. Magic, HESS) and space (e.g. Fermi)...
Jonathan Biteau
(UC Santa Cruz)
01/08/2015, 15:30
GA-IN
Poster contribution
Gamma-ray observations in the very-high-energy domain (E > 30 GeV) can exploit the imaging of Cherenkov flashes lasting a few nanoseconds from atmospheric particle showers. Photomultipliers have been used as the primary photosensors to detect gamma-ray induced Cherenkov light for the past 25 years, but they are increasingly challenged by the swift progress of silicon photomultipliers (SiPMs)....
Pierre Colin
(MPI fuer Physik)
01/08/2015, 15:30
GA-EX
Poster contribution
MAGIC is a system of two 17m diameter Imaging Atmospheric Cherenkov Telescopes (IACT) located at the Observatorio del Roque de los Muchachos in the Canary island of La Palma. It observes the gamma-ray sky from ~50 GeV to more than 50 TeV. The IACT technique works preferentially in very dark condition. The best performance and lowest energy threshold are reached at dark astrophysical sites...
Iurii Sushch
(North-West University)
01/08/2015, 15:30
GA-TH
Poster contribution
Blazars, a class of radio-loud active galactic nuclei with their jets pointed close to the line of sight to Earth, are the most abundant extragalactic gamma-ray sources detected both by the Fermi Gamma-Ray Space Telescope and by groundbased atmospheric Cherenkov Telescope facilities. Most blazars are known to be hosted in giant Elliptical galaxies, but their cluster environments are poorly...
Carlo Francesco Vigorito
(Universita' di Torino),
Silvia Vernetto
(Istituto Nazionale di Astrofisica)
01/08/2015, 15:30
GA-EX
Poster contribution
The LHAASO (Large High Altitude Air Shower Observatory) experiment, currently under
design, is planned to be installed in the Sichuan Province (China) at 4410 m a.s.l.
with the aim
of studying the highest energy gamma-ray sources and cosmic rays in the wide energy
range from hundreds of GeV to hundreds of TeV. Among its different components,
optimized to study different energy regions,...
Elisabetta Bissaldi
(INFN Bari)
01/08/2015, 15:30
GA-IN
Poster contribution
The first Gamma-Ray Burst catalog presented by the Fermi-LAT collaboration includes 28 GRBs, detected above 100 MeV over the first three years since the launch of the Fermi mission. However, more than 100 GRBs are expected to be found over a period of six years of data collection thanks to a new detection algorithm and to the development of a new LAT event reconstruction, the so-called "Pass...
Michael Daniel
01/08/2015, 15:30
GA-EX
Poster contribution
The assumption of Lorentz invariance is one of the founding principles of modern physics and violation of that would have deep consequences to our understanding of the universe. Potential signatures of such a violation could range from energy dependent dispersion introduced into a light curve to a change in the photon-photon pair production threshold that changes the expected opacity of the...
Jacek Niemiec
(Institute of Nuclear Physics PAN, Krakow, Poland)
01/08/2015, 15:30
GA-IN
Poster contribution
A single-mirror small-size (SST-1M) Davies-Cotton telescope with a dish diameter of 4 m has been built by a consortium of Polish and Swiss institutions for the southern observatory of the Cherenkov Telescope Array (CTA). The design represents a very simple, reliable, and cheap solution for a small size telescope of CTA. The mechanical structure prototype with its drive system is now being...
Iurii Sushch
(North-West University)
01/08/2015, 15:30
GA-EX
Poster contribution
The initially unidentified very high energy (VHE; E > 100 GeV) gamma-ray source HESS J1303-631 was recently associated with the pulsar PSR J1301-6305 basing on its enregy-dependent morphology. Subsequent detection of X-ray and GeV counterparts also support the identification of the H.E.S.S. source as evolved pulsar wind nebula (PWN). We report here on recent radio observations of the PSR...
Jan Ebr
(Institute of Physics, Prague)
01/08/2015, 15:30
GA-IN
Poster contribution
The Cherenkov Telescope Array (CTA) is the next generation of ground-based very high energy gamma-ray instruments and will be built on two sites (one in each hemisphere) in the coming years, with full array operation foreseen to begin 2020. The goal of performing a high precision gamma-ray energy measurement while maximizing the use of observation time demands detailed and fast information...
Dr
Adrian C. Rovero
(Instituto de Astronomia y Fisica del Espacio (IAFE, CONICET-UBA))
01/08/2015, 15:30
GA-EX
Poster contribution
Gamma-ray emission in the range of VHE (TeV) is strongly attenuated by the photon-photon interaction with the extragalactic background light (EBL), the diffuse cosmological radiation field (UV to far-IR) encompassing all radiative energy releases since recombination. As a consequence all discovered VHE sources are relatively close (z <0.6, except perhaps for the recent detection of the blazar...
Iurii Sushch
(North-West University)
01/08/2015, 15:30
GA-TH
Poster contribution
PSR B1259-63/LS 2883 is a very high energy (VHE; E > 100 GeV) gamma-ray emitting binary consisting of a 48 ms pulsar orbitting around a Be star with a period of 3.4 years. The Be star features a circumstellar disk which is inclined with respect to the orbit in such a way that the pulsar crosses it twice every orbit. The circumstellar disk provides an additional field of target photons which...
Segev BenZvi
(University of Rochester)
01/08/2015, 15:30
GA-EX
Poster contribution
The High-Altitude Water Cherenkov (HAWC) Observatory is a large field-of-view, high-uptime detector which measures TeV cosmic rays and gamma rays from 2/3 of the sky each day. The large uptime and field of view make the detector well-suited to observe time-dependent emission from objects such as pulsars and TeV binaries. Very high energy gamma rays have been observed from only a small number...
Stanislav Stefanik
(Institute of Particle and Nuclear Physics, Charles University in Prague)
01/08/2015, 15:30
GA-EX
Poster contribution
We describe a straightforward modification of frequently invoked methods
for the determination of the statistical significance of a $\gamma$-ray
signal observed in a counting process.
A simple criterion is proposed to decide whether a set of measurements
of the numbers of photons registered in the source and background regions
is consistent with the assumption of a constant source...
Riccardo Rando
(University and INFN Padova)
01/08/2015, 15:30
GA-IN
Poster contribution
The Cherenkov Telescope Array (CTA) is the the next generation facility of Imaging Atmospheric Cherenkov Telescopes; two observatories will cover both hemispheres. CTA will reach unprecedented sensitivity, energy and angular resolution in very-high-energy gamma-ray astronomy. Each CTA array will include four Large Size Telescopes (LSTs), designed to cover the low-energy range of the CTA...
Atsushi Iyono
(Okayama University of Science)
01/08/2015, 15:30
GA-IN
Poster contribution
To examine the nuclear emulsion chemical uniformity or Poisson distribution of grains, simulations of electron trajectory have been carried out on the basis of the single elastic scattering Monte Carlo method considering energy straggling processes and their fluctuations. To compare these simulated results, image processing method of charged particle tracks in nuclear emulsion have also been...
Amanda Weinstein
(Iowa State University)
01/08/2015, 15:30
GA-IN
Poster contribution
It is anticipated that the forthcoming Cherenkov Telescope Array will include a number of medium-sized telescopes that are constructed using a dual-mirror Schwarzschild-Couder configuration. These telescopes will sample a wide (8 degree) field of view using a densely pixelated camera comprising over $10^{4}$ individual readout channels. A readout frequency congruent with the expected...
Dr
Fabian Schüssler
(Irfu, CEA-Saclay)
01/08/2015, 15:30
GA-EX
Poster contribution
Microquasars, Galactic binary systems showing extended and variable radio emission, are potential gamma-ray emitters. Indications of gamma-ray transient episodes have been reported in at least two systems, Cyg X-1 and Cyg X-3. The identification of additional gamma-ray emitting microquasars is key for a better understanding of these systems.
Very-high energy gamma-ray emission from...
Dr
Elisabetta Bissaldi
(INFN Trieste)
01/08/2015, 15:30
GA-IN
Poster contribution
The Italian Institute of Nuclear Physics (INFN) is involved in the development
of a demonstrator for a SiPM-based camera for the Cherenkov Telescope Array experiment, with a pixel
size of 6x6mm$^2$.
The camera houses about two thousands electronics channels and is both light and compact.
In this framework, an R&D program for the development of SiPMs suitable for
Cherenkov light detection...
Patrick Yves Sizun
(CEA/IRFU,Centre d'etude de Saclay Gif-sur-Yvette (FR))
01/08/2015, 15:30
GA-EX
Poster contribution
The Cherenkov Telescope Array (CTA) will be the next generation ground-based gamma-ray instrument. It will be made up of approximately 100 telescopes of at least three different sizes, from 4 to 23 meters in diameter.
The previously presented prototype of a high speed data acquisition (DAQ) system for CTA has become concrete within the NectarCAM project, one of the most challenging camera...
Elisa Prandini
(University of Geneva)
01/08/2015, 15:30
GA-EX
Poster contribution
The MAGIC telescopes are an array of two imaging atmospheric Cherenkov telescopes (IACTs) studying the gamma ray sky at very high-energies (VHE; E>100 GeV). The observations are performed in stereoscopic mode, with both telescopes pointing at the same position in the sky. Differently from the other running IACTs, the MAGIC field of view (FoV) acceptance for hadrons and gamma rays has a complex...
Maoyuan Liu, Prof.
luobu danzeng
(Department of Physics, Science School, Tibet University)
01/08/2015, 15:30
GA-IN
Poster contribution
Owing to the advantages in the wide field of view, high duty cycle and large effective area, ground based high altitude EAS experiments play an important role in studying the high energy gamma ray bursts (GRBs). While shower mode technique provides the most sensitive way in searching for GRBs above 100GeV energy, the single-particle technique can extend the GRBs search energy down to GeV...
Luigi Tibaldo
(SLAC)
01/08/2015, 15:30
GA-IN
Poster contribution
TARGET is an application specific integrated circuit (ASIC) designed to perform the readout of signals recorded by the photosensors in cameras of very-high-energy gamma-ray telescopes exploiting the imaging of Cherenkov radiation from atmospheric showers. TARGET capabilities include sampling at a high rate (typically 1 GSample/s), digitization, and triggering on the sum of four adjacent...
Dr
Laura Valore
(University of Naples / INFN Naples)
01/08/2015, 15:30
GA-IN
Poster contribution
The Cherenkov Telescope Array (CTA) is the next generation of ground-based very high energy gamma-ray instruments; the facility will be organized in two arrays, one for each hemisphere. The atmospheric calibration of the CTA telescopes is a critical task. The atmosphere affects the measured Cherenkov yield in several ways: the air-shower
development itself, the variation of the Cherenkov...
Dorota Sobczynska
(University of Lodz)
01/08/2015, 15:30
GA-IN
Poster contribution
A system of Imaging Air Cherenkov Telescopes (IACTs) can be triggered by hadronic events containing Cherenkov light from at most two electromagnetic subcascades, which are products of the single $\pi^0$ decay. The recorded images of those showers have a similar shape to the primary $\gamma$-ray events. Therefore, they are hardly reducible background for observations using IACTs.
In this...
Michael Daniel
01/08/2015, 15:30
GA-IN
Poster contribution
The Cherenkov Telescope Array (CTA) will be the next generation ground based observatory in very high energy gamma ray astronomy. The facility will achieve a wide energy coverage, starting from a threshold of a few tens of GeV up to hundreds of TeV by utilising several classes of telescopes, each optimised for different regions of the gamma-ray spectrum. The required energy resolution of...
Dr
John E Ward
(IFAE)
01/08/2015, 15:30
GA-IN
Poster contribution
The Cherenkov Telescope Array (CTA) is a future ground-based observatory (with two locations, in the northern and southern hemispheres) that will be used in the study of the very-high-energy gamma-ray sky. CTA observations will be proposed by external users or initiated by the observatory, with the resulting measurements being processed by the CTA observatory and the reduced data made...
Fabian Schüssler
(CEA)
01/08/2015, 15:30
GA-EX
Poster contribution
The Cherenkov Telescope Array (CTA) observatory will be one of the largest ground-based very-high-energy gamma-ray observatories.
The on-site analysis will perform a first CTA scientific analysis of data acquired from the array of telescopes, in both northern and southern sites. The On-Site Analysis has two pipelines: the Level-A pipeline (also known as Real-Time Analysis, RTA) and the...
Dr
Masaaki Hayashida
(Institute for Cosmic-Ray Research, University of Tokyo)
01/08/2015, 15:30
GA-IN
Poster contribution
The Large Size Telescope (LST) of the Cherenkov Telescope Array (CTA) is designed to achieve a threshold energy of 20 GeV. The LST optics is composed of one parabolic primary mirror 23 m in diameter and 28 m focal length. The reflector dish is segmented in 198 hexagonal, 1.51 m flat to flat mirrors. The total effective reflective area, taking into account the shadow of the mechanical...
Vera Georgievna Sinitsyna
(P.N. Lebedev Physical Institute)
01/08/2015, 15:30
GA-EX
Poster contribution
The investigation of VHE gamma-ray sources by any methods, including mirror Cherenkov telescopes, touches on the problem of the cosmic ray origin and, accordingly, the role of the Galaxy in their generation. The SHALON observations have yielded the results on Galactic supernova remnants (SNR) of different ages. Among them are: the shell-type SNRs Tycho's SNR (1572y), Cas A (1680y), IC 443 (age...
Alessandro Carosi
(INAF-ASDC)
01/08/2015, 15:30
GA-EX
Poster contribution
The increasing number of Very High Energy (VHE) sources discovered by the current generation of Cherenkov telescopes made particularly relevant the creation of a dedicated source catalogs as well as the cross-correlation of VHE and lower energy bands data in a multi-wavelength framework. The "TeGeV Catalogue" hosted at the ASI Science Data Center (ASDC) is a catalogue of VHE sources observed...
Stanislav Stefanik
(Institute of Particle and Nuclear Physic, Charles University in Prague)
01/08/2015, 15:30
GA-EX
Poster contribution
We report on an unidentified gamma-ray signal found in the region around the BL Lac object 1ES 0229+200.
It was recognized serendipitously in our analysis of 6.2 years of Fermi-LAT data at a distance less than $3^\circ$ away from the blazar.
The observed excess of counts manifests itself as an unexpected local maximum in the test statistic map.
Although several Fermi-LAT sources have been...
Prof.
ANDRES SANDOVAL
(INSTITUTO DE FISICA UNAM)
01/08/2015, 15:30
GA-IN
Poster contribution
The initial concept of the HAWC Observatory, an air shower array of 300 water Cherenkov detectors on the slope of Sierra Negra in Mexico, has been successfully carried out with the completion of construction in December 2014. The HAWC detector, located 4100 m above sea level, has begun continuous operation surveying the sky for cosmic rays and gamma rays between 100 GeV and 100 TeV. The...
Dr
Simona Toscano
(Vrije Universiteit Brussel (VUB); University of Geneva)
01/08/2015, 15:30
GA-EX
Poster contribution
Imaging Atmospheric Cherenkov Telescopes (IACTs) are ground-based instruments devoted to the study of very high energy gamma-rays coming from space. The detection technique consists in observing images created by the Cherenkov light emitted when gamma rays, or more in general cosmic rays, propagate in the atmosphere. While in case of protons or gammas the images present a filled and more or...
Juan Cortina
(IFAE)
01/08/2015, 15:30
GA-IN
Poster contribution
MAGIC is a system of two Imaging Atmospheric Cherenkov Telescopes (IACT) that observe Very High Energy (VHE) gamma ray sources. The PMTs in their cameras are designed to operate under moonlight, but they are limited to Moon phases below 93% (300 Moon hours per year), as they can get damaged if the amount of light they receive is too high. As a result, they cannot be used 2-3 days before and...
Ruben Lopez-Coto
(Institut de Fisica d'Altes Energies - IFAE)
01/08/2015, 15:30
GA-EX
Poster contribution
In the last few years the Fermi-LAT instrument has detected GeV gamma-ray emission from several novae. Such GeV emission can be interpreted in terms of inverse Compton emission from electrons accelerated in the shock or in terms of emission from hadrons accelerated in the same conditions. The latter might reach much higher energies and could produce a second component in the gamma-ray spectrum...
