THE REDSHIFT DISTRIBUTION OF DUSTY STAR-FORMING GALAXIES FROM THE SPT SURVEY-猫眼课题宝

DOI：

10.3847/0004-637x/822/2/80

发表时间：

2016-03

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：

M. Strandet;A. Weiss;J. Vieira;C. De Breuck;J. Aguirre;M. Aravena;M. Ashby;M. Béthermin;C. Bradford;J. Carlstrom;S. Chapman;T. Crawford;W. Everett;C. Fassnacht;R. Furstenau;A. Gonzalez;T. Greve;B. Gullberg;Y. Hezaveh;J. Kamenetzky;K. Litke;J. Ma;M. Malkan;D. Marrone;K. Menten;E. Murphy;A. Nadolski;K. Rotermund;J. Spilker;A. Stark;N. Welikala

我们在周期 1 中使用阿塔卡马大型毫米/亚毫米阵列 (ALMA) 来确定南极望远镜 (SPT) 巡天中通过 1.4 毫米连续发射选择的高红移尘埃恒星形成星系 (DSFG) 的光谱红移。我们展示了 15 个星系在 84 至 114 GHz 之间的 ALMA 3 毫米光谱扫描以及针对另外 8 个源的定向 ALMA 1 毫米观测。我们的观察结果产生了 30 个来自 CO、[C i]、[N ii]、H2O 和 NH3 的新谱线检测。我们进一步介绍了阿塔卡马探路者实验 [C ii] 和对 7 个源的 CO 中 J 观测，这些源在 ALMA 周期 0 或周期 1 的光谱扫描数据中仅检测到一条线。我们将新的观测结果与先前发表的以及 SPT 选择的 DSFG 的新毫米/亚毫米线和光度数据相结合，以研究其红移分布。合并后的数据产生了 39 个来自分子谱系的光谱红移，成功率 >85%。我们的样本代表了当今同类中最大的数据集，并且在所有高 z DSFG 红移调查中具有最高的光谱完整性。红移分布的中位数为 z = 3.9 ± 0.4，我们样本中最高红移源位于 z = 5.8。我们讨论光源的选择如何影响红移分布，重点关注光源亮度、选择波长和强引力透镜效应。我们校正了引力透镜效应，并找到了 1.4 mm 选定光源的红移分布，中值红移为 z = 3.1 ± 0.3。与文献中在较短波长下选择的红移分布相比，我们表明选择波长会影响红移分布的形状。

We use the Atacama Large Millimeter/submillimeter Array (ALMA) in Cycle 1 to determine spectroscopic redshifts of high-redshift dusty star-forming galaxies (DSFGs) selected by their 1.4 mm continuum emission in the South Pole Telescope (SPT) survey. We present ALMA 3 mm spectral scans between 84 and 114 GHz for 15 galaxies and targeted ALMA 1 mm observations for an additional eight sources. Our observations yield 30 new line detections from CO, [C i], [N ii], H2O and NH3. We further present Atacama Pathfinder Experiment [C ii] and CO mid-J observations for seven sources for which only a single line was detected in spectral-scan data from ALMA Cycle 0 or Cycle 1. We combine the new observations with previously published and new millimeter/submillimeter line and photometric data of the SPT-selected DSFGs to study their redshift distribution. The combined data yield 39 spectroscopic redshifts from molecular lines, a success rate of >85%. Our sample represents the largest data set of its kind today and has the highest spectroscopic completeness among all redshift surveys of high-z DSFGs. The median of the redshift distribution is z = 3.9 ± 0.4, and the highest-redshift source in our sample is at z = 5.8. We discuss how the selection of our sources affects the redshift distribution, focusing on source brightness, selection wavelength, and strong gravitational lensing. We correct for the effect of gravitational lensing and find the redshift distribution for 1.4 mm selected sources with a median redshift of z = 3.1 ± 0.3. Comparing to redshift distributions selected at shorter wavelengths from the literature, we show that selection wavelength affects the shape of the redshift distribution.

THE REDSHIFT DISTRIBUTION OF DUSTY STAR-FORMING GALAXIES FROM THE SPT SURVEY

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