Conveners
Relativistic outflows from extragalactic sources
- Kazushi Iwasawa (Universitat de Barcelona / ICCUB)
Relativistic outflows from extragalactic sources
- David Paneque (Max Planck Institute for Physics)
Relativistic jets in AGN emit radiation at all wavelengths,
from radio to TeV gamma-rays. The main source of their power seems the rotation of the black hole. Their radiation mechanisms however remains elusive. I will review the current status and some recent observations which are challenging
common views, in particular about variability, location of the gamma-ray emitting regions, particle...
Owing to their brightness and proximity (z=0.03), Mrk 421 and Mrk 501 are among the blazars that can be studied with the greatest level of detail; and hence a sort of astrophysical laboratories to study the blazar's phenomena. In the conference I will show that these two objects can change their personality from one season to the next, sometimes showing a remarkably extreme character in the...
Mrk 421 is a high-synchrotron-peaked blazar featuring bright and persistent GeV and TeV emission. We use the longest and densest ongoing unbiased observing campaign obtained at TeV and GeV energies during 5.5 years with the FACT telescope and the Fermi LAT detector. The contemporaneous multi-wavelength observations were used to characterize the variability of the source and to constrain the...
The FSRQ CTA 102 (z=1.032) has been tremendously active over the last few years. During its peak activity lasting several months in late 2016 and early 2017, the gamma-ray and optical fluxes rose by up to a factor 100 above the quiescence level. We have interpreted the peak activity as the ablation of a gas cloud by the relativistic jet, which can nicely account for the months-long lightcurve...
I will review several open questions in GRB physics as well as how latest observational data shed light into them. The topics include jet composition, energy dissipation mechanism, radiation mechanism, progenitors, and central engine. The exciting aspects of gravitational wave - GRB associations will be discussed, with GW170817/GRB 170817A as an example.
The Transient High-Energy Sky and Early Universe Surveyor (THESEUS) is a space mission concept currently under Phase A study by ESA as candidate M5 mission, aiming at exploiting Gamma-Ray Bursts for investigating the early Universe and at providing a substantial advancement of multi-messenger and time-domain astrophysics. Through an unprecedented combination of X-/gamma-rays monitors,...
