Cosmological X-Ray Flashes from Off-Axis Jets

Details Cosmological X-Ray Flashes from Off-Axis Jets Cosmological X-Ray Flashes from Off-Axis Jets

2003-11-25

arxiv.org/abs/astro-ph/0311549v1

Astronomy and Astrophysics

Astrophysics

4 pages, 3 figures aipTEX, contribution to the 2003 GRB Conference, held at Santa Fe, NM

Scientific paper

10.1063/1.1810813

The of the cosmological X-ray flashes detected by WFC/BeppoSAX is calculated 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, off-axis emission from sources at z<~4 can be seen. The theoretical is less than 0.4, which is consistent with the observational result 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.

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