Graham 2008 目前最好确定红移的短暴070714B

主要内容:
通过宿主星系定红移。红移为0.9, 次高的为 GRB051221, 0.55.

精彩摘抄:


文章信息:

arXiv:0802.1346 [pdf, other]

Title: GRB 070714B - Discovery of the Highest Spectroscopically Confirmed Short Burst Redshift

Authors: J. F. Graham (1 and 2), A. S. Fruchter (1), A. J. Levan (3), M. Nysewander (1), N. R. Tanvir (4), T. Dahlen (1), D. Bersier (5), A. Pe'er (1) ((1) Space Science Telescope Institute, (2) Johns Hopkins University, (3) University of Warwick, (4) University of Leicester, (5) Liverpool John Moores University)

Comments: Conference procedings for Gamma Ray Bursts 2007 November 5-9, 2007 Santa Fe, New Mexico (4 pages, 2 figures)

Subjects: Astrophysics (astro-ph)

Gemini Nod & Shuffle spectroscopy on the host of the short GRB 070714B shows a single emission line at 7167 angstroms which, based on a grizJHK photometric redshift, we conclude is the 3727 angstrom [O II] line. This places the host at a redshift of z=.923 exceeding the previous record for the highest spectroscopically confirmed short burst redshift of z=.546 held by GRB 051221. This dramatically moves back the time at which we know short bursts were being formed, and suggests that the present evidence for an old progenitor population may be observationally biased.