Evidence of a Two-Component Jet in the Afterglow of GRB 070419A

Details Evidence of a Two-Component Jet in the Afterglow of GRB 070419A Evidence of a Two-Component Jet in the Afterglow of GRB 070419A

2009-07-08

arxiv.org/abs/0907.1328v1

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

3 pages, PDF only, accepted for publication in Science in China Series G

Scientific paper

A two-component jet model is proposed to explain the unusual afterglow of GRB 070419A. Regarding the optical light curve, a wide "jet" with an opening angle of > 30-40 degrees is assumed to produce the late shallow decay, while the three early power-law segments must be caused by a narrow jet with an opening angle of about 2-4 degrees. Additional energy injections to both components are required. Late X-ray emission may come from either the wide jet or the narrow one. If the latter is correct, the jets may run into an ISM environment and the temporal index of the late energy injection q may be about 0.65.

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