Troja 2007 short bursts progenitors

主要内容:
NS-BH, NS-NS

精彩摘抄:


文章信息:

arXiv:0711.3034 [ps, pdf, other]

Title: Different progenitors of short hard gamma-ray bursts

Authors: Eleonora Troja, Andrew R. King, Paul T. O'Brien, Nicola Lyons, Giancarlo Cusumano

Comments: 5 pages, 2 figures, accepted for publication in MNRAS

Subjects: Astrophysics (astro-ph)

We consider the spatial offsets of short hard gamma-ray bursts (SHBs) from their host galaxies. We show that all SHBs with extended duration soft emission components lie very close to their hosts. We suggest that NS-BH binary mergers offer a natural explanation for the properties of this extended duration/low offset group. SHBs with large offsets have no observed extended emission components and are less likely to have an optically detected afterglow, properties consistent with NS-NS binary mergers occurring in low density environments.