Xiao 2009 长时延的暴来自附近的猜测不成立

主要内容:
通过对18个长时延的Swift暴的分析, (其中17个的红移大于0.5)认为以前猜测长时延的暴来自本地是不对的, 从而LIGO也不能看到其引力波辐射.

(奇怪的是关于这个结论只需要红移就搞定了, 不知道为什么作者还加了很多别的分析手段如和cluster是否靠近等.)

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Title:		Are Swift Long-Lag Gamma-Ray Bursts in the Local Supercluster?
Authors:		Xiao, Limin; Schaefer, Bradley E.
Publication:		eprint arXiv:0904.2566
Publication Date:		04/2009
Origin:		ARXIV
Keywords:		Astrophysics - Cosmology and Extragalactic Astrophysics
Comment:		14 pages, 1 figure, ApJ accepted
Bibliographic Code:		2009arXiv0904.2566X

Abstract

A sample of 18 long-lag (tau_{lag} > 1 s) Gamma-Ray Bursts (GRBs) has been drawn from our catalog of all Swift long GRBs. Four different tests are done on this sample to test the prediction that a large fraction of long-lag GRBs are from our Local Supercluster. The results of these four tests come out that: (1) the distribution of these GRBs shows no tendency towards the Supergalactic plane; (2) the distribution shows no tendency towards the Virgo or Coma Cluster; (3) no associated bright host galaxies (m <=15) in the Local Supercluster are found for any of the 18 GRBs; (4) 17 of these 18 GRBs have redshifts of z>0.5, which are too far to be in the Local Supercluster. All these results disproved the hypothesis that any significant fraction of long-lag GRBs are from Local Supercluster. Hence these long-lag GRBs can not be counted in the calculation of LIGO detection rates. An explanation of why we can detect long-lag GRBs at high redshift is presented.

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