Conveners
Searches for Extragalactic astrophysical sources: - 1
- Dario Gasparrini (Istituto Nazionale di Fisica Nucleare)
The era of the Swift and Fermi missions has marked a significant advance in the study of Gamma-Ray Bursts (GRBs). Swift’s rapid detection and multi-wavelength observation capabilities have uncovered diverse GRB populations, including high-redshift bursts, and revealed extended emissions and X-ray flares, thus improving our knowledge of the environments surrounding GRBs.
Fermi’s Large Area...
The ultra-luminous, long-duration transient event GRB 221009A was detected by several observatories - as the most luminous gamma-ray burst ever observed - from radio to VHE gamma rays, up to tens of TeV.
AGILE detected an extraordinary incoming flux of hard X-ray and high-energy gamma-ray photons during this unprecedented event. The high-energy emission (from tens of keV up to GeV energies)...
GRB 221009A, a relatively nearby (redshift z= 0.1505) and exceptionally bright gamma-ray burst, has been detected with the LHAASO-WCDA instrument in the energy range of 0.2-7 TeV, as well as with the LHAASO-KM2A array up to the energy of $\approx 13$ TeV. The unprecedentedly high fluence of TeV gamma-rays from GRB 221009A allows us, for the first time for GRBs, to set constraints on the...
Since 2019, the AGILE satellite has been involved in searches for high-energy counterparts to Fast Radio Bursts (FRBs) following the discovery of Repeating-FRBs (R-FRBs) with low excess Dispersion Measure ($DM_{EXC}$) by the CHIME/FRB instrument. These R-FRBs are closer than the average sample of FRBs detected at higher DM values. A new pipeline was developed to perform archival searches in...
AGILE is a high-energy astrophysics space mission launched in 2007 which terminated the operations in 2024. Its payload is comprised of the Gamma-Ray Imaging Detector (GRID), the SuperAGILE X-ray detector, the Mini-Calorimeter (MCAL), and an AntiCoincidence System (ACS).
Over the past few years, the AGILE Team has developed deep learning (DL) models to analyze sky maps and time series...
In the first part of this review, I will present the current state of open-source radiative modelling tools for the multiwavelength emission from extragalactic relativistic jets. I will highlight the features and the limitations of these tools related to the implementation of the different physical processes, and I will discuss the implications in terms of reproducibility, interoperability,...
Blazars have been studied for more than half a century, but they are still far from being understood. The advent of new instrumentation brings new perspectives that are starting to help out unravelling the insights of these powerful cosmic accelerators. One of the novel facilities is the IXPE satellite, that reported the first measurement of X-ray polarization in blazars in the year 2022, thus...
Active galactic nuclei (AGN) can launch and sustain powerful wide-angle winds which can unbind the gas from the host galaxies, offering a plausible physical origin for the black hole-galaxy co-evolution.
Propagating through the galaxy, AGN-driven winds can interact with the interstellar medium creating strong shocks which are able to accelerate charged particles to high energies. Accelerated...
After nearly two decades of operation, the current generation of Imaging Atmospheric Cherenkov Telescopes (IACTs) - consisting of MAGIC, VERITAS, and H.E.S.S. - has identified approximately 100 very-high-energy (VHE, E > 100GeV) gamma-ray sources beyond our Galaxy, most of which are Active Galactic Nuclei (AGNs), reaching up to a redshift of z=1. The forthcoming Cherenkov Telescope Array...
About one third of Fermi-LAT sources are unassociated. In this talk, I will present recent developments in the multi-class classification of Fermi-LAT sources using machine learning with the goal of probabilistic classification of the unassociated sources. A particular attention will be paid to the fact that the distributions of associated and unassociated sources are different as a function...
Lorentz invariance violation (LIV) in gamma rays can have multiple consequences, such as energy-dependent photon group velocity, photon instability, vacuum birefringence, and modified electromagnetic interaction. Depending on how LIV is introduced, several of these effects can occur simultaneously. Nevertheless, in experimental tests of LIV, each effect is tested separately and independently....
