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arXiv 1206.2641astro-ph.CO
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哈勃深场中z=5.2星系超密度区的强星暴HDF850 .1

The Intense Starburst HDF850.1 in a Galaxy Overdensity at z=5.2 in the Hubble Deep Field

Fabian Walter, R. Decarli, C. Carilli, F. Bertoldi, P. Cox, E. Da Cunha, E. Daddi, M. Dickinson, D. Downes, D. Elbaz, R. Ellis, J. Hodge, R. Neri, D. Riechers, … 展开作者

Fabian Walter, R. Decarli, C. Carilli, F. Bertoldi, P. Cox, E. Da Cunha, E. Daddi, M. Dickinson, D. Downes, D. Elbaz, R. Ellis, J. Hodge, R. Neri, D. Riechers, A. Weiss, E. Bell, H. Dannerbauer, M. Krips, M. Krumholz, L. Lentati, R. Maiolino, K. Menten, H. -W. Rix, B. Robertson, H. Spinrad, D. Stark, D. Stern

摘要:

哈勃深场(HDF)是天空中的一个区域,提供了遥远宇宙最深的多波长视图之一,并导致在整个宇宙时间内检测到数千个星系。HDF在850微米波长处的早期地图对恒星形成提供动力的尘埃发射敏感,揭示了该领域最亮的光源,被称为HDF850.1。十多年来,这个源仍然难以捉摸,尽管付出了巨大的努力,但在较短波长处没有对应物,因此没有红移,大小或质量,可以确定。在这里,我们报告,使用毫米波分子线扫描,一个明确的红移测定HDF 850.1的z=5.183。这将HDF850.1置于HDF中z~5.2的星系过密度中,对应于大爆炸后宇宙年龄仅为1.1 Gyr。这一红移明显高于早期的估计,也高于迄今为止发现的大多数>100个亚毫米明亮星系。该源的恒星形成速率为850 M_sun/yr,空间分辨率为5 kpc,隐含的动力学质量为~1.3x10^11 M_sun,其中很大一部分以分子气体的形式存在。尽管我们有精确的红移和位置,但来自星光的对应物仍然难以捉摸。

英文摘要:

The Hubble Deep Field (HDF) is a region in the sky that provides one of the deepest multi-wavelength views of the distant universe and has led to the detection of thousands of galaxies seen throughout cosmic time. An early map of the HDF at a wavelength of 850 microns that is sensitive to dust emission powered by star formation revealed the brightest source in the field, dubbed HDF850.1. For more than a decade, this source remained elusive and, despite significant efforts, no counterpart at shorter wavelengths, and thus no redshift, size or mass, could be identified. Here we report, using a millimeter wave molecular line scan, an unambiguous redshift determination for HDF850.1 of z=5.183. This places HDF850.1 in a galaxy overdensity at z~5.2 in the HDF, corresponding to a cosmic age of only 1.1 Gyr after the Big Bang. This redshift is significantly higher than earlier estimates and higher than most of the >100 sub-millimeter bright galaxies identified to date. The source has a star formation rate of 850 M_sun/yr and is spatially resolved on scales of 5 kpc, with an implied dynamical mass of ~1.3x10^11 M_sun, a significant fraction of which is present in the form of molecular gas. Despite our accurate redshift and position, a counterpart arising from starlight remains elusive.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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