红移 6.34 处一个尘埃遮蔽的大质量最大星暴星系
宇宙学与河外天体物理
2013-04-19 v1
摘要
现今的大质量早型（椭圆和透镜状）星系可能在早期宇宙中最巨大的暗物质晕中，通过强烈的、被尘埃遮蔽的星暴（即恒星形成率增加）获得了其大部分恒星质量和重元素。然而，此类大质量星暴前身星体在宇宙大爆炸后多久出现仍然未知。长期以来，人们怀疑 dusty、大质量星暴的红移分布由于选择效应而偏向低红移，近期对红移 z~5 系统的发现证实了这一点。在此，我们报告通过亚毫米颜色选择技术识别出一个红移为 6.34 的大质量星暴星系。我们通过一系列分子和原子精细结构冷却线明确测定了其红移。这些测量揭示该星系中存在一千亿太阳质量的高度激发、化学演化的星际介质，构成了至少 40% 的重子质量。“最大星暴”将气体转化为恒星的速率超过银河系的 2000 倍，这是任何时期观测到的最高速率之一。尽管宇宙恒星形成总体趋势在最高红移处呈下降态势，但似乎足以形成最巨大、最强烈星暴的环境早在宇宙大爆炸后 8.8 亿年就已存在。
引用
@article{arxiv.1304.4256,
title = {A Dust-Obscured Massive Maximum-Starburst Galaxy at a Redshift of 6.34},
author = {Dominik A. Riechers and C. M. Bradford and D. L. Clements and C. D. Dowell and I. Perez-Fournon and R. J. Ivison and C. Bridge and A. Conley and Hai Fu and J. D. Vieira and J. Wardlow and J. Calanog and A. Cooray and P. Hurley and R. Neri and J. Kamenetzky and J. E. Aguirre and B. Altieri and V. Arumugam and D. J. Benford and M. Bethermin and J. Bock and D. Burgarella and A. Cabrera-Lavers and S. C. Chapman and P. Cox and J. S. Dunlop and L. Earle and D. Farrah and P. Ferrero and A. Franceschini and R. Gavazzi and J. Glenn and E. A. Gonzalez Solares and M. A. Gurwell and M. Halpern and E. Hatziminaoglou and A. Hyde and E. Ibar and A. Kovacs and M. Krips and R. E. Lupu and P. R. Maloney and P. Martinez-Navajas and H. Matsuhara and E. J. Murphy and B. J. Naylor and H. T. Nguyen and S. J. Oliver and A. Omont and M. J. Page and G. Petitpas and N. Rangwala and I. G. Roseboom and D. Scott and A. J. Smith and J. G. Staguhn and A. Streblyanska and A. P. Thomson and I. Valtchanov and M. Viero and L. Wang and M. Zemcov and J. Zmuidzinas},
journal= {arXiv preprint arXiv:1304.4256},
year = {2013}
}
备注
35 pages, 19 figures, 5 tables, including Supplementary Information (version formatted by the authors). To appear in Nature. Under press embargo until 18:00 London time/13:00 US Eastern Time on 17 April 2013