Séminaire Doctoral / Seminar PhD |
| « A population model for Gamma Ray Bursts » |
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Jesse Palmerio |
| Gamma-Ray Bursts (GRBs) are short, intense bursts of electromagnetic radiation in the hard X-rays and soft gamma-rays originating from space. They are associated with ultra-relativistic jets produced by a newborn accreting stellar mass black hole. There are two classes of GRBs : long GRBs (if their duration is longer than 2 seconds) which have observational evidence tying them to the gravitational collapse of some massive stars, and short GRBs (if their duration is shorter than 2 seconds) which are believed to be associated with the coalescence of compact objects. Because of their detectability up to very high redshift (z > 9) and their transient nature, GRBs and their associated phenomena offer a unique tool to probe the distant universe. However, there are still today uncertainties about the underlying short and long GRB populations. In this talk I will first give a historical overview of the current paradigm for GRBs, then I will present some preliminary results of my work on a Monte Carlo population code which aims to measure the parameters of the luminosity function, the redshift distribution and the spectral model of the different classes of GRBs and ultimately to constrain the underlying progenitors. |
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mercredi 1 février 2017 - 17:00 Salle Entresol Daniel Chalonge, Institut d'Astrophysique |
| Page web du séminaire / Seminar's webpage |