A REDSHIFT SURVEY OF HERSCHEL FAR-INFRARED SELECTED STARBURSTS AND IMPLICATIONS FOR OBSCURED STAR FORMATION-猫眼课题宝

DOI：

10.1088/0004-637x/761/2/140

发表时间：

2012-10

期刊：

The Astrophysical Journal

影响因子：

通讯作者：

中科院分区：

其他

文献类型：

作者：

C. Casey;S. Berta;M. B'ethermin;J. Bock;C. Bridge;J. Budynkiewicz;D. Burgarella;E. Chapin;S. Chapman;D. Clements;A. Conley;C. Conselice;A. Cooray;D. Farrah;E. Hatziminaoglou;R. Ivison;E. Floc’h;D. Lutz;G. Magdis;B. Magnelli;S. Oliver;M. Page;F. Pozzi;D. Rigopoulou;L. Riguccini;I. Roseboom;D. Sanders;D. Scott;N. Seymour;I. Valtchanov;J. Vieira;M. Viero;J. Hawaii;Mpe;Saclay;Ias;Caltech;Jpl;Umass;Marseille;Ubc;Esac;Cambridge;Dalhousie;Imperial;Colorado;Nottingham;Uci;Virginia Tech;Eső;Ukatc;Edinburgh;Oxford;Sussex;Mssl;Bologna;Ral;Nasa Ames;Csiro

我们介绍了用Keck I低分辨率成像光谱仪和Keck II深度成像多目标光谱仪拍摄的250、350和500μm的767Herschel-Spire选定星系(HSG)的Keck光谱观测和红移。赫歇尔多层星系外勘测的这些尖顶光源的红移分布在z=0.85时达到峰值，其中731个光源位于z&lt；2，尾部的光源位于z∼5。我们测量到的光度红移和光谱红移(<Δz/(1+zspec)>=0.29)之间的差异比在非红外选择的样本中看到的更大，这可能是由于恒星形成速度的提高和红外选择星系中的尘埃遮蔽。红外数据用于直接测量积分红外光度和尘埃温度，而不受射电或24μm通量密度的影响。通过探测其峰值的尘埃光谱能量分布(SED)，我们估计绝大多数(72%-83%)赫歇尔选择的星系将在0.85-1毫米处退出传统的亚毫米探测。我们发现尘埃温度跟踪红外光度，部分原因是尖顶波长选择偏差，部分是物理效应。因此，我们测量的尖顶颜色与红移没有显著的趋势；如果尘埃温度与光度或红移无关，则尖顶颜色的趋势是可以预期的。复合红外SED被构建为红外光度的函数，显示了尘埃温度随着光度的增加而增加，以及近红外和中红外光谱性质的细微变化。对于这个部分射电选择的样品，测量到了远红外(FIR)/射电相关的适度演化，在z&lt；2的QIR∝(1+z)−为0.30±0.02。我们估计了z&lt；1.6HSG的光度函数和隐含的恒星形成率密度贡献，并根据24μm的LIRG、ULIRG和总红外贡献的外推结果发现，总体上与工作一致。这项工作显著增加了z≫0时光谱确认的红外发光星系的数量，并证明了尘埃星暴对星系演化研究和整个宇宙时间内恒星质量积累越来越重要。

We present Keck spectroscopic observations and redshifts for a sample of 767 Herschel-SPIRE selected galaxies (HSGs) at 250, 350, and 500 μm, taken with the Keck I Low Resolution Imaging Spectrometer and the Keck II DEep Imaging Multi-Object Spectrograph. The redshift distribution of these SPIRE sources from the Herschel Multitiered Extragalactic Survey peaks at z = 0.85, with 731 sources at z < 2 and a tail of sources out to z ∼ 5. We measure more significant disagreement between photometric and spectroscopic redshifts (〈Δz/(1 + zspec)〉 = 0.29) than is seen in non-infrared selected samples, likely due to enhanced star formation rates and dust obscuration in infrared-selected galaxies. The infrared data are used to directly measure integrated infrared luminosities and dust temperatures independent of radio or 24 μm flux densities. By probing the dust spectral energy distribution (SED) at its peak, we estimate that the vast majority (72%–83%) of z < 2 Herschel-selected galaxies would drop out of traditional submillimeter surveys at 0.85–1 mm. We find that dust temperature traces infrared luminosity, due in part to the SPIRE wavelength selection biases, and partially from physical effects. As a result, we measure no significant trend in SPIRE color with redshift; if dust temperature were independent of luminosity or redshift, a trend in SPIRE color would be expected. Composite infrared SEDs are constructed as a function of infrared luminosity, showing the increase in dust temperature with luminosity, and subtle change in near-infrared and mid-infrared spectral properties. Moderate evolution in the far-infrared (FIR)/radio correlation is measured for this partially radio-selected sample, with qIR∝(1 + z)−0.30 ± 0.02 at z < 2. We estimate the luminosity function and implied star formation rate density contribution of HSGs at z < 1.6 and find overall agreement with work based on 24 μm extrapolations of the LIRG, ULIRG, and total infrared contributions. This work significantly increased the number of spectroscopically confirmed infrared-luminous galaxies at z ≫ 0 and demonstrates the growing importance of dusty starbursts for galaxy evolution studies and the build-up of stellar mass throughout cosmic time.

A REDSHIFT SURVEY OF HERSCHEL FAR-INFRARED SELECTED STARBURSTS AND IMPLICATIONS FOR OBSCURED STAR FORMATION

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