Conveners
Multi-messenger
- Kohta Murase (Penn State University)
Multi-messenger
- Amanda Weinstein (Iowa State University)
Multi-messenger
- Shin'ichiro Ando (University of Amsterdam)
Multi-messenger
- Maria Petropoulou (Purdue University)
Advanced LIGO's ongoing observation runs provided humanity with the first direct detection of gravitational waves, just in time for the 100th anniversary of Einstein's prediction. Beyond the discovery, there is a growing focus on incorporating gravitational waves as a new window on questions from violent transients to cosmology. I will discuss some aspects of (i) the instrumental breakthroughs...
I present my recent paper arXiv:1704.05073 on making projections for measuring the black hole birth rate from the diffuse supernova neutrino background (DSNB) by future neutrino experiments, and the information which can be gained by combining this with the merger rate from LIGO. The DSNB originates from neutrinos emitted by all the supernovae in the Universe, and is expected to be made up of...
We study gravitational wave (GW) production from bubble dynamics
during a cosmic first-order phase transition
by using the method of relating the GW spectrum to the two-point correlation function
of the energy-momentum tensor < T(x) T(y) >.
We adopt the thin-wall approximation but not the envelope approximation,
and take the (long-lasting) non-envelope parts into account by assuming free...
With the discovery of binary black hole mergers by LIGO, the era of gravitational wave (GW) astronomy and multi-messenger astronomy including GWs has begun. As the advanced LIGO and Virgo detectors approach design sensitivity in the next few years, exciting discoveries are expected to be made, including neutron star mergers, which are among the most promising GW events for multi-messenger...
The Astrophysical Multimessenger Observatory Network (AMON), will connect observatories from around the world, enabling real-time coincidence searches of all four messengers (neutrinos, cosmic rays, gamma rays, and gravitational waves) and rapid follow-up observations of these alerts. AMON’s first real-time alerts were commissioned in 2016 with “pass-through” notices of IceCube likely-cosmic...
Fast radio bursts (FRBs) are non-periodic millisecond radio outbursts that are thought to be of astrophysical origin. Since the first FRB was discovered by the Parkes Radio Telescope in 2007, a total of 23 FRBs with unique locations (FRB 121102 has repeated dozens of times) have been observed to date, with multiple radio telescopes. Although the nature of the FRBs is still largely unknown, the...
Recently a repeating fast radio burst (FRB) 121102 has been confirmed to be an extragalactic event and a persistent radio counterpart has been identified. One of the leading models is the young neutron star model, in which a pulsar (or magnetar) of $\leq$ 100 yrs-old surrounded by a wind nebula and supernova remnant are considered and connections between FRBs and luminous pulsar-driven...
IceCube has reported discovery of the first high-energy astrophysical neutrino candidates, however the nature of the sources responsible for these neutrinos - potentially also the sources of the highest-energy cosmic rays - is still unknown and no high-confidence electromagnetic counterparts to any of the neutrino events have yet been detected. If the sources producing these highest-energy...
The IceCube neutrino observatory routinely detects astrophysical neutrinos at TeV to PeV energies, but the origin of this signal is still unknown. To facilitate the identification of electromagnetic counterparts via time-domain searches, IceCube has begun issuing realtime public alerts for the highest confidence and best-localized neutrino events (median angular uncertainty < 1.0 deg). During...
The Fermi Gamma-ray Burst Monitor (GBM) is an all-sky monitoring instrument sensitive to energies from 8 keV to 40 MeV. Over the past 8 years of operation, the GBM has detected over 240 gamma-ray bursts per year and provided timely GCN notices with localization to few-degree accuracy for follow-up observations. In addition to GRBs, Galactic transients, solar flares, and terrestrial gamma-ray...
We present the results of an archival coincidence analysis between
public gamma-ray data from the Fermi LAT satellite and public
neutrino data from the IceCube neutrino observatory during its
40-string and 59-string observing runs. The analysis has the
potential to detect either a statistical excess of correlated
neutrino + gamma-emitting sources or alternatively, one or more
rare,...
Recently many observational facilities have entered in their operational phase or they will approach the design sensitivity in the nearest future, allowing us to observe the universe with very high energy photons, cosmic rays, neutrinos and gravitational waves.
The MAGIC observatory: a system of two Imaging Atmospheric Cherenkov Telescopes located at the Canary Island of La Palma, thanks to...
The direct detection, for the first time, of gravitational wave (GW) transients by Advanced LIGO has motivated searches for their electromagnetic counterparts at all wavelengths. Neutrino astronomy is an emerging area of study in high-energy astrophysics, and astrophysical neutrinos are natural cousins of very high energy (VHE; E > 100 GeV) gamma rays. The VERITAS gamma-ray observatory has an...
The current generation of Cherenkov telescopes, together with Fermi-LAT, has greatly improved our knowledge of blazar physics, providing a precise measurement of their gamma-ray emission. The modeling of multi-wavelength spectral energy distributions of blazars has been proven to be a unique tool to constrain and refine blazar emission models, and thus the physics of outflows from...
We test the hypothesis that blazars are sources of Ultra-High Energy Cosmic Rays (UHECR), considering acceleration of isotopes heavier than Hydrogen. We perform numerical simulations of CR interactions using the NeuCosmA code. The injected isotope may efficiently disintegrate at high energies, thus producing a population of lighter secondaries. We study the ejected CR composition and neutrino...
Neutrino stacking analyses constrain the paradigm that Gamma-Ray Bursts (GRBs) are the sources of the Ultra-High Energy Cosmic Rays (UHECRs). The majority of previous studies focused on a pure proton composition of UHECRs; however, recent measurements by the Pierre Auger Observatory indicate a trend towards a mixed UHECR composition. Here, we present a combined source-propagation model for...
It has been a mystery that with ten orders of magnitude difference in energy, high-energy neutrinos, ultrahigh-energy cosmic rays, and sub-TeV gamma rays all present comparable energy injection rate, hinting an unknown common origin. Here we show that black hole jets embedded in clusters of galaxies may work as sources of all three messengers. By simulating the particle propagation in the...
I will summarize the All-Sky Automated Survey for Supernovae (ASAS-SN), the first astronomical survey to observe the entire visible sky for bright optical transients on a nightly basis.
