Davies 2007 长暴的双星起源

主要内容:
认为双星并合（其中一个为大质量星）至少是长暴的起源之一。

精彩摘抄:


文章信息:
Progenitors of Long Gamma-ray Bursts

Authors: Melvyn B. Davies, Andrew J. Levan, Josefin Larsson, Andrew R. King, Andrew S. Fruchter

(Submitted on 15 Apr 2007)

Abstract: Pinpointing the progenitors of long duration gamma-ray bursts (LGRBs) remains an extremely important question, although it is now clear that at least a fraction of LGRBs originate in the core collapse of massive stars in type Ic supernovae, the pathways to the production of these stars, and their initial masses, remain uncertain. Rotation is thought to be vital in the creation of LGRBs, and it is likely that black hole creation is also necessary. We suggest that these two constraints can be met if the GRB progenitors are very massive stars (>20 solar masses) and are formed in tight binary systems. Using simple models we compare the predictions of this scenario with observations and find that the location of GRBs on their host galaxies are suggestive of main-sequence masses in excess of 20 solar masses, while 50% of the known compact binary systems may have been sufficiently close to have had the necessary rotation rates for GRB creation. Thus, massive stars in compact binaries are a likely channel for at least some fraction of LGRBs.

Comments:

To appear in "Gamma-ray bursts: Prospects for GLAST", AIP Conference proceedings 906, Editors M. Axelsson and F Ryde

Subjects:

Astrophysics (astro-ph)

Cite as:

arXiv:0704.1899v1 [astro-ph]