Cosmological X-ray Flashes in the Off-Axis Jet Model
Astrophysics
2009-11-07 v2
Abstract
The <V/Vmax> of the cosmological X-ray flashes detected by Wide Field Cameras on BeppoSAX is calculted theoretically in a simple jet model. The total emission energy from the jet is assumed to be constant. We find that if the jet opening half-angle is smaller than 0.03 radian, the theoretical <V/Vmax> is less than ~0.4, which is consistent with the recently reported observational value of 0.27+/-0.16 at the 1-sigma level. This suggests that the off-axis GRB jet with the small opening half-angle at the cosmological distance can be identified as the cosmological X-ray flash.
Cite
@article{arxiv.astro-ph/0212557,
title = {Cosmological X-ray Flashes in the Off-Axis Jet Model},
author = {Ryo Yamazaki and Kunihito Ioka and Takashi Nakamura},
journal= {arXiv preprint arXiv:astro-ph/0212557},
year = {2009}
}
Comments
13 pages, 3 eps figures, ApJ in press