Stanway 2010 限制高红移暴的宿主星系的分子气

主要内容:
通过谱的没有某些发射线，从而限制宿主星系的相应分子的含量。得到的结论是像 090423这样的高红移的暴并不诞生于星暴星系中，而是比较普通的恒星形成区。

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Title:		Constraining the Molecular Gas in the Environs of a z~8 Gamma Ray Burst Host Galaxy
Authors:		Stanway, Elizabeth R.; Bremer, Malcolm N.; Tanvir, Nial R.; Levan, Andrew J.; Davies, Luke J. M.
Publication:		eprint arXiv:1008.3383
Publication Date:		08/2010
Origin:		ARXIV
Keywords:		Astrophysics - Cosmology and Extragalactic Astrophysics
Comment:		7 pages, 3 figures, MNRAS accepted
Bibliographic Code:		2010arXiv1008.3383S

Abstract

GRB 090423 is the most distant spectroscopically-confirmed source observed in the universe. Using observations at 37.5 GHz, we place constraints on molecular gas emission in the CO(3-2) line from its host galaxy and immediate environs. The source was not detected either in line emission or in the rest-frame 850 micron continuum, yielding an upper limit of S_{8mm}=9.3 milli-Jy and M(H_2)<4.3x10^9 M_sun (3 sigma), applying standard conversions. This implies that the host galaxy of GRB 090423 did not possess a large reservoir of warm molecular gas but was rather modest either in star formation rate or in mass. It suggests that this was not an extreme starburst, and hence that gamma ray bursts at high redshift trace relatively modest star formation rates, in keeping with the behaviour seen at lower redshifts. We do, however, identify a millimetre emission line source in the field of GRB 090423. Plausible interpretations include a CO(1-0) emitting galaxy at z=2.1, CO(2-1) at z=5.2 and CO(3-2) at z=8.3. Efforts to identify a counterpart for the molecular line emitter and to further characterise this source are continuing.

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