HUBBLE SPACE TELESCOPE GRISM SPECTROSCOPY OF EXTREME STARBURSTS ACROSS COSMIC TIME: THE ROLE OF DWARF GALAXIES IN THE STAR FORMATION HISTORY OF THE UNIVERSE

HUBBLE SPACE TELESCOPE GRISM SPECTROSCOPY OF EXTREME STARBURSTS ACROSS COSMIC TIME: THE ROLE OF DWARF GALAXIES IN THE STAR FORMATION HISTORY OF THE UNIVERSE
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宇宙时间极端星暴的哈勃太空望远镜格里斯光谱:矮星系在宇宙恒星形成历史中的作用

DOI:
10.1088/0004-637x/789/2/96
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发表时间:
2014
期刊:
The Astrophysical Journal
影响因子:
--
通讯作者:
Atek H
Atek H
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--
文献类型:
--
作者:
Atek H

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哈勃太空望远镜上的宽视场相机3的近红外无缝光谱提供了一个独特的机会来研究高红移(z = 1-2)的低质量星系群。虽然大多数高z观测都偏向于大质量星系,但我们能够通过它们的发射线选择具有非常微弱连续谱的源。我们研究了在0.3 μ z ~ 2.3的宽红移范围内发现的约1000个发射线星系的星星形成率(SFR)-恒星质量(M_∞)关系。我们使用Hα辐射作为一个精确的SFR指标,并校正了强星云贡献的宽带测光,以获得精确的恒星质量,低至M 10 7 M。我们在这里集中在一个子样本的星系,显示极强的发射线(EELG)与休息帧等效宽度范围从200到1500?这个群体由正常SFR-M序列的异常值组成,具有更高的特异性SFR(> 10 Gyr− 1)。虽然顺序星系遵循连续的星星形成过程,但EELG被认为是在星星形成的极端爆发期间捕获的,这种爆发可以在不到1亿年的时间内使其恒星质量增加一倍。星爆人口的总星星形成密度的贡献似乎是大于已报告的更大的星系在以前的研究。在完整质量范围8.2< log(M/M)< 10,SFR完整性下限约为2 M yr− 1(10 M yr− 1)在z = 1(z = 2),我们发现EW休止(Hα)> 300,200和100 π的星爆贡献分别高达13%,18%和34%,在z = 1-2处发射谱线选择样品的总SFR。与大质量星系样本的比较表明,星暴对低质量星系的贡献有所增加。
Near infrared slitless spectroscopy with the Wide Field Camera 3, on board the Hubble Space Telescope, offers a unique opportunity to study low-mass galaxy populations at high redshift (z∼ 1–2). While most high-z surveys are biased toward massive galaxies, we are able to select sources via their emission lines that have very faint continua. We investigate the star formation rate (SFR)–stellar mass (M⋆) relation for about 1000 emission line galaxies identified over a wide redshift range of 0.3≲ z≲ 2.3. We use the Hα emission as an accurate SFR indicator and correct the broadband photometry for the strong nebular contribution to derive accurate stellar masses down to M⋆∼ 10 7 M☉. We focus here on a subsample of galaxies that show extremely strong emission lines (EELGs) with rest-frame equivalent widths ranging from 200 to 1500 Å. This population consists of outliers to the normal SFR–M⋆ sequence with much higher specific SFRs (> 10 Gyr− 1). While on-sequence galaxies follow continuous star formation processes, EELGs are thought to be caught during an extreme burst of star formation that can double their stellar mass in a period of less than 100 Myr. The contribution of the starburst population to the total star formation density appears to be larger than what has been reported for more massive galaxies in previous studies. In the complete mass range 8.2< log (M⋆/M☉)< 10 and a SFR lower completeness limit of about 2 M☉ yr− 1 (10 M☉ yr− 1) at z∼ 1 (z∼ 2), we find that starbursts having EW rest (Hα)> 300, 200, and 100 Å contribute up to∼ 13%, 18%, and 34%, respectively, to the total SFR of emission-line-selected sample at z∼ 1–2. The comparison with samples of massive galaxies shows an increase in the contribution of starbursts toward lower masses.
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