HerMES: a search for high-redshift dusty galaxies in the HerMES Large Mode Survey – catalogue, number counts and early results
HerMES: a search for high-redshift dusty galaxies in the HerMES Large Mode Survey – catalogue, number counts and early results
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DOI：
10.1093/mnras/stw1769
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发表时间：
2016-01
影响因子：
4.8
通讯作者：
V. Asboth;A. Conley;J. Sayers;M. Béthermin;S. Chapman;D. Clements;A. Cooray;A. Cooray;H. Dannerbauer;D. Farrah;J. Glenn;S. Golwala;M. Halpern;E. Ibar;R. Ivison;P. Maloney;R. Marques-Chaves;R. Marques-Chaves;P. Mart́ınez-Navajas;P. Mart́ınez-Navajas;S. Oliver;I. Pérez-Fournon;I. Pérez-Fournon;D. Riechers;M. Rowan‐Robinson;D. Scott;S. Siegel;J. Vieira;M. Viero;Lingyu Wang;Lingyu Wang;J. Wardlow;J. Wardlow;J. Wheeler
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文献类型：
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作者：
V. Asboth;A. Conley;J. Sayers;M. Béthermin;S. Chapman;D. Clements;A. Cooray;A. Cooray;H. Dannerbauer;D. Farrah;J. Glenn;S. Golwala;M. Halpern;E. Ibar;R. Ivison;P. Maloney;R. Marques-Chaves;R. Marques-Chaves;P. Mart́ınez-Navajas;P. Mart́ınez-Navajas;S. Oliver;I. Pérez-Fournon;I. Pérez-Fournon;D. Riechers;M. Rowan‐Robinson;D. Scott;S. Siegel;J. Vieira;M. Viero;Lingyu Wang;Lingyu Wang;J. Wardlow;J. Wardlow;J. Wheeler
从赫歇尔/光谱和光度成像接收器 (SPIRE) 图中选择通量密度不断增加、波长较长的光源是生成富含高红移 (z > 4) 尘埃恒星形成星系目录的有效方法。这种方法的有效性已经被光谱后续观测所证实，但以前用这种方法制作的目录受到小调查区域的限制。在这里，我们将基于地图的搜索方法应用于赫歇尔多层河外巡天 (HerMES) 大模式巡天的 274 deg^2，并创建包含 SPIRE 通量密度 S_(500) > S_(350) > S_(250) 和 5σ 截止 S_(500) > 52 mJy 的 477 个天体的目录。从这个目录中，我们确定这些“红色”源的总数至少比星系演化模型预测的要高一个数量级。这些结果与之前在规模较小的 HerMES 油田中的研究结果一致；然而，由于我们的样本量明显更大，我们也能够首次研究红色源计数的形状。我们使用阿塔卡马大型毫米/亚毫米阵列获得了两个光源的光谱红移测量结果。红移 z = 5.1 和 3.8 证实，通过我们的选择方法，我们确实可以找到高红移尘埃恒星形成星系。
Selecting sources with rising flux densities towards longer wavelengths from Herschel/Spectral and Photometric Imaging Receiver (SPIRE) maps is an efficient way to produce a catalogue rich in high-redshift (z > 4) dusty star-forming galaxies. The effectiveness of this approach has already been confirmed by spectroscopic follow-up observations, but the previously available catalogues made this way are limited by small survey areas. Here we apply a map-based search method to 274 deg^2 of the Herschel Multi-tiered Extragalactic Survey (HerMES) Large Mode Survey and create a catalogue of 477 objects with SPIRE flux densities S_(500) > S_(350) > S_(250) and a 5σ cut-off S_(500) > 52 mJy. From this catalogue we determine that the total number of these ‘red’ sources is at least an order of magnitude higher than predicted by galaxy evolution models. These results are in agreement with previous findings in smaller HerMES fields; however, due to our significantly larger sample size we are also able to investigate the shape of the red source counts for the first time. We have obtained spectroscopic redshift measurements for two of our sources using the Atacama Large Millimeter/submillimeter Array. The redshifts z = 5.1 and 3.8 confirm that with our selection method we can indeed find high-redshift dusty star-forming galaxies.