Description
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Active Galactic Nuclei (AGN) and their relativistic jets that emit radiation covering almost the entire electromagnetic spectrum have been few of the most fascinating subjects in astronomy for decades, yet the composition of these relativistic jets is still not clearly known. The origin of the high energy peak in the Spectral Energy Distribution (SED) of blazars has been an open question in...
Ultra-high-energy cosmic rays (UHECRs) get deflected by extragalactic magnetic fields
(EGMFs) when they propagate from their sources to Earth. The spread of UHECRs around
their source position provides a measure of the strength of the turbulent EGMFs between the
UHECR sources and Earth. Recent results from the Pierre Auger Observatory (PAO) suggest correlations between the arrival...
The ALPACA experiment is a composite air shower array experiment aiming to observe cosmic rays and gamma rays in TeV to PeV energy range in the Southern Hemisphere. The experiment consists of a 83,000 m2 surface detector array and 3,600 m2 underground water Cherenkov type muon detector in the Chacaltaya plateau (4,740 m a.s.l) in Bolivia. Currently, the prototype experiment is fully...
Radio astronomy has emerged in the last decade as a promising approach for detecting Weakly Interacting Massive Particles (WIMPs) annihilation and decay signatures, particularly due to its capability to distinguish and detect diffuse emission.
Local Group dwarf spheroidal galaxies (dSphs) are ideal targets for these searches due to their high dark-matter content and low astrophysical...
We present a toolkit developed with students at the LAMBDA laboratory at Buenos Aires University, which facilitates data acquisition, calibration, and reconstruction of particle events. We designed this kit around the Sony IMX477 CMOS sensor, an affordable off-the-shelf sensor priced at around 50 USD and easily integrated with a Raspberry Pi. This camera enables, for example, the visualization...
The search of γ-ray emission from accreting pulsars in X-ray binaries (XRBs) has been ongoing for some time. Recent marginal detections in high-mass X-ray binaries (HMXBs) have sparked renewed interest in this area. Anticipating future advances in γ-ray telescopes, we investigate the expected emission above 10 GeV from XRBs using an enhanced Cheng & Ruderman model. This model incorporates...
Gamma-ray bursts (GRBs) are high-energy phenomena from distant galaxies that emit intense gamma rays in short durations. GRBs are a key target in multi-messenger astronomy, and various X-ray and gamma-ray instruments have searched for GRBs associated with gravitational waves or high-energy neutrinos. The CALorimetric Electron Telescope (CALET), a scientific payload for cosmic-ray observations...
Recent hundred PeV muon track in downward in downward horizons of ARCA km3 array detector surpprised most of the observer. This UHE event, if confirmed, might be the first signature of UHECR secondaries . The photon pion GZK cut off on proton or the photo-nuclear disintegration may be the source of it. However the presence of such a rare and huge event in such a small and new detector...
It is generally accepted that in supernova remnants (SNRs), charged particles are accelerated to cosmic-ray energies through the mechanism of diffusive shock acceleration (DSA). The most compelling observational evidence supporting this model is related to the electron component: relativistic electrons with energies of about $\sim 10$ GeV, accelerated in SNRs, generate nonthermal radio...
We have studied the propagation of galactic cosmic rays in the heliosphere using data from the large-area multi-directional muon telescope of GRAPES-3 during periods of relatively normal solar activity and have investigated the rigidity or solar activity dependence of the diffusion coefficient of the solar radial component.
This is done to get an average picture of the propagation of...
This study presents an updated search for magnetic monopoles using data collected over a 14-year period (2008–2022) by the ANTARES neutrino telescope. The interaction of magnetic monopoles with matter was modeled using the Kasama, Yang, and Goldhaber cross-section. Upper limits on the flux of magnetic monopoles were derived for velocities both above and below the Cherenkov threshold. No events...
Accreting neutron stars are expected to emit a redshifted 2.2 MeV line resulting from neutron capture. The detection of this line would provide constraints on the neutron star equation of state and offer insights into the nuclear reactions within the neutron star atmosphere. We have developed a theoretical framework aimed at predicting the optimal X-ray luminosity for the detection of this...
Extraterrestrial high-energy neutrinos serve as unique probes for unveiling extreme astrophysical processes and tracing the origins of cosmic rays, but their detection is highly challenging. This study simulates the lateral distribution characteristics of secondary particles，including in extensive air showers induced by protons and neutrinos within the energy range of 100 TeV to 100 PeV and...
The understanding of micro-quasars is one of the frontiers of high energy astrophysics. Their models are based on a capturing mass by compact objects , Neutron star (NS) or in general Black Hole (BH), with a nearby spiraling binary companion star. The companion star mass usually feeds an accretion disk around the NS or the BH. The in-falling mass also fuels a precessing X and gamma jets,...
The ASTRI Mini-Array (MA) is an international project led by the Italian National Institute for Astrophysics (INAF) to construct and operate an observatory dedicated to gamma-ray astronomy in the TeV spectral band. The ASTRI MA is currently under construction and will consist of an array of nine innovative Imaging Atmospheric Cherenkov Telescopes located at the Teide Astronomical Observatory,...
Isolated active galactic nuclei (AGNs) serve as unique laboratories for studying nuclear activity driven solely by internal processes within galaxies. In this study, we analyze the X-ray emission of 2MIG isolated AGNs at redshifts up to 0.05. These AGNs are generally weak X-ray sources. Our sample consists of 61 isolated galaxies, with X-ray emission detected in only 25 of them. Among these,...
