[SEMINARI] Photospheric Thermal Radiation From GRB Collapsar Jets, Akira Mizuta

[Enric Marco]

Photospheric Thermal Radiation From GRB Collapsar Jets

by Akira Mizuta

from: Theory Center, Institute of Particle and Nuclear Studies, KEK 
(High Energy Accelerator Research Organization), Japan

Seminari del departament d'Astronomia i Astrofísica

Dilluns 25 juliol 2011

12:00

Resum

The gamma-ray bursts (GRBs) are one of the most luminous events in the 
universe. The radiation mechanism of GRB prompt emission is still 
underdebate. If a central engine makes a fireball, we can expect strong 
thermal emission from the photosphere. We have performed numerical 
hydrodynamic simulations of GRB jet propagation from collapsars and have 
derived photospheric thermal radiation by the post process. The light 
curves and spectra are derived for the observers at different viewing 
angles. We observe a few seconds time variability in the light curves 
caused by the internal mass density and Lorentz factor discontinuities 
in the jets. When we plot E_p-E_{iso} or E_p-L_{iso}_p, we can see 
similar dependence with empirical GRB cosmological relations such as 
Amati relation and Yonetoku relation.

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/------------------------------------\
 Dr. Enric Marco
 Departament d'Astronomia i Astrofísica
 Facultat de Física
 Universitat de València
 C/  Dr. Moliner, 50
 46100 Burjassot, Spain
 Phone: (34)-96-354-3069
 Fax:(34)-96-354-3084
 enric.marco en uv.es
 http://www.uv.es/marco
 http://www.uv.es/aulaastronomia
 http://www.uv.es/daa
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