Cenko 2008 高红移（z~0.9）短暴070429B and 070714B

主要内容:
从宿主星系的OII发射线得到红移。说明有很大一部分的短暴红移较大，30%（>0.7）

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· arXiv e-print (arXiv:0802.0874)

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Title:		GRBs 070429B and 070714B: The High End of the Short-Duration Gamma-Ray Burst Redshift Distribution
Authors:		Cenko, S. Bradley; Berger, Edo; Nakar, Ehud; Kasliwal, Mansi M.; Cucchiara, Antonio; Kulkarni, Shri R.; Ofek, Eran; Fox, Derek B.; Harrison, Fiona A.; Rau, Arne; Price, Paul A.; Gal-Yam, Avishay; Dopita, Michael A.; Penprase, Bryan E.
Publication:		eprint arXiv:0802.0874
Publication Date:		02/2008
Origin:		ARXIV
Keywords:		Astrophysics
Comment:		ApJL submitted; 4 pages, 3 figures; Comments welcome
Bibliographic Code:		2008arXiv0802.0874C

Abstract

We present optical spectra of the host galaxies of the short-duration gamma-ray burst GRB 070429B and the likely short-duration with extended emission GRB 070714B. In both cases, we find a single emission line that we identify as O II lambda 3727 at z ~ 0.9. Both events are more distant than any previous short-duration GRB with a secure host association from the sub-arcsecond position of an optical afterglow. GRBs 070429B and 070714B provide strong evidence in support of our previous claims in Berger et al. that a significant fraction of short-duration hosts (>~ 33%) reside at z > 0.7. We discuss the implications of the existence this population on the energetics of short-duration GRBs, as well as on progenitor models. In the context of the degenerate binary merger scenario, such events require progenitor systems with a range of lifetimes and disfavor progenitor models with a long, narrow lifetime distribution.

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