Larsson 2007 伽玛暴前身星质量限制

主要内容:
伽玛暴和超新星在星系中的分布明显不同，伽玛暴（长暴）比超新星更集中于星系中心。暗示这长暴的前身星质量更大，最终形成黑洞。

精彩摘抄:


文章信息:

astro-ph/0701562 [abs, ps, pdf, other] :

Title: A new constraint for gamma-ray burst progenitor mass
Authors: Josefin Larsson, Andrew J. Levan, Melvyn B. Davies, Andrew S. Fruchter
Comments: 7 pages, 4 figures, accepted by MNRAS

Recent comparative observations of long duration gamma-ray bursts (LGRBs) and core collapse supernovae (cc SN) host galaxies demonstrate that these two, highly energetic transient events are distributed very differently upon their hosts. LGRBs are much more concentrated on their host galaxy light than cc SN. Here we explore the suggestion that this differing distribution reflects different progenitor masses for LGRBs and cc SN. Using a simple model we show that, assuming cc SN arise from stars with main sequence masses $>$8 M$_{\odot}$, GRBs are likely to arise from stars with initial masses $>$ 20 M$_{\odot}$. This difference can naturally be explained by the requirement that stars which create a LGRB must also create a black hole.