Conveners
Astrophysical Multimessenger techniques & observations: 1
- Massimo Mastrodicasa (ROMA1)
The AGILE space mission, having capabilities well suited to transient source studies, participated to all the recent campaigns to search for electromagnetic (e.m.) counterparts to gravitational wave (GW) events detected by the LIGO-Virgo-KAGRA interferometers during the observing runs O2, O3, and the initial part of O4 (O4a), which ended on January 16th, 2024.
AGILE operations ended on...
A complete view of gravitational wave (GW) events requires combining GW observations with broadband electromagnetic follow-up. In particular, TeV gamma rays, the most-energetic electromagnetic radiation currently associated with individual sources, will be crucial in understanding the acceleration processes and the environment near compact object mergers.
The current generation of...
Recent breakthrough discoveries in multi-messenger astronomy (MMA) include the first identifications of gravitational wave and neutrino cosmological sources, such as active galactic nuclei and gamma-ray bursts. Despite the still limited number of identified sources so far, the relevance of gamma/X-ray observations in MMA is already evident. More identifications are expected over the next...
In date 9th of October 2022, several ground-based and space-based detectors observed a Gamma-Ray Burst (GRB) then called GRB 221009A, which is recorded as the most energetic ever detected (with $E_{iso}$ ~ $10^{55}$ erg, for this reason also known as the B.O.A.T., brightest of all time) spanning its emission over the whole electromagnetic spectrum, up to the very high energy (VHE) gamma-ray...
Photons, neutrinos, gravitational waves and cosmic rays may originate from the same source regions, so a multi-messenger approach is crucial for a better understanding of the physics behind the production and propagation of these messengers. In this context, the Pierre Auger Observatory plays a key role to investigate the highest-energy primary particles, given its ability to distinguish...
Tidal Disruption Events (TDEs) are energetic optical transients that occur when stars are tidally disrupted upon approaching the tidal radius of a supermassive black hole. Three TDEs and candidates (AT2019dsg, AT2019fdr, and AT2019aalc) have been found to coincide in time and position with three IceCube astrophysical neutrino events. In this talk, I will review the multi-messenger (neutrino...
Gamma-ray bursts (GRBs) are powerful explosions emitting high-energy photons, followed by a less energetic afterglow emission. They occur at a rate of a few per day in the observable Universe. After more than fifty years of detecting and characterising GRBs in the electromagnetic spectrum, they are considered potential sources of extragalactic cosmic rays. While no neutrinos have been detected...
Gamma rays, high-energy neutrinos and cosmic rays (CRs) impinging on Earth signal the existence of environments in the Universe that allow acceleration of particle populations into the extremely energetic regime. The general consensus of a CR--gamma-ray--neutrino connection as a basis for the search of the long-sought ultra-high-energy (UHE) CR sources has recently been weakened by the results...
Gamma-ray burst (GRB), GRB 221009A, a long-duration GRB, was observed simultaneously by the Water Cherenkov Detector Array (WCDA) and the Kilometer Squared Array (KM2A) of the Large High Altitude Air Shower Observatory (LHAASO) during the prompt emission and the afterglow periods. Characteristic multi-TeV photons up to 13 TeV were observed in the afterglow phase. The observed very high-energy...
