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arXiv 0802.0874astro-ph
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GRB 070429 B和070714 B:短持续时间伽马射线暴红移分布的高端

GRBs 070429B and 070714B: The High End of the Short-Duration Gamma-Ray Burst Redshift Distribution

S. Bradley Cenko, Edo Berger, Ehud Nakar, Mansi M. Kasliwal, Antonio Cucchiara, Shri R. Kulkarni, Eran Ofek, Derek B. Fox, Fiona A. Harrison, Arne Rau, Paul A. … 展开作者

S. Bradley Cenko, Edo Berger, Ehud Nakar, Mansi M. Kasliwal, Antonio Cucchiara, Shri R. Kulkarni, Eran Ofek, Derek B. Fox, Fiona A. Harrison, Arne Rau, Paul A. Price, Avishay Gal-Yam, Michael A. Dopita, Bryan E. Penprase

摘要:

我们给出了短持续时间伽马射线暴GRB 070429 B和可能的短持续时间扩展发射GRB 070714 B的宿主星系的光谱。在这两种情况下,我们发现一个单一的发射线,我们确定为O II λ 3727在z ~ 0.9。这两个事件都比以往任何短持续时间的伽玛暴与安全的主机协会从光学余辉的亚弧秒位置更遥远。GRB 070429 B和070714 B提供了强有力的证据,支持我们先前在Berger等人中的主张,即很大一部分短持续时间宿主(> 33%)位于z > 0.7。我们讨论了短持续时间的伽玛暴的能量,以及祖模型的存在这个人口的影响。在退化的二元合并的情况下,这样的事件需要祖系统的寿命范围和不利于祖模型与长,窄的寿命分布。

英文摘要:

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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