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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 1:30 |
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Conference: Bucharest University Faculty of Physics 2003 Meeting
Section: Atomic and Molecular Physics; Astrophysics
Title:
Energy budget in collimated gamma-ray bursts
Authors:
Valeriu Tudose(1), Peter Biermann(2,3)
Affiliation:
(1) Astronomical Institute of the Romanian Academy, Bucharest, Romania
(2) Max-Planck Institute for Radioastronomy, Bonn, Germany
(3) Department of Physics & Astronomy, University of Bonn, Germany
E-mail
Keywords:
Abstract:
There is increasing evidence for the existence of collimation in some, if not most, of the gamma-ray bursts. This would have direct implications, for instance, on the energy budget, the rate of events, but also indirect consequences for the theoretical models because it provides a tool to differentiate between their predictions. We consider the case of a structured jet, i.e. we assume the energy within the jet varies as a power-law, being a function of the angle between the jet axis and an arbitrary direction. We analyze first the situation in which the jet axis and the line of sight have a particular orientation, then we relax this assumption by allowing for an arbitrary viewing angle with respect to the symmetry axis of the jet. A qualitative study of the
total energy content of the jet is performed. It turns out that the "real" energy could be higher than what is inferred from observations.
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