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arXiv 1601.02665astro-ph.GA
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HerMES:在HerMES大模态巡天中寻找高红移尘埃星系-星表、计数和早期结果

HerMES: A search for high-redshift dusty galaxies in the HerMES Large Mode Survey - Catalogue, number counts and early results

V. Asboth, A. Conley, J. Sayers, M. Bethermin, S. C. Chapman, D. L. Clements, A. Cooray, H. Dannerbauer, D. Farrah, J. Glenn, S. R. Golwala, M. Halpern, E. Ibar… 展开作者

V. Asboth, A. Conley, J. Sayers, M. Bethermin, S. C. Chapman, D. L. Clements, A. Cooray, H. Dannerbauer, D. Farrah, J. Glenn, S. R. Golwala, M. Halpern, E. Ibar, R. J. Ivison, P. R. Maloney, R. Marques-Chaves, P. I. Martinez-Navajas, S. J. Oliver, I. Perez-Fournon, D. A. Riechers, M. Rowan-Robinson, Douglas Scott, S. R. Siegel, J. D. Vieira, M. Viero, L. Wang, J. Wardlow, J. Wheeler

摘要:

从Herschel/SPIRE图中选择通量密度向长波长方向上升的源是产生富含高红移(z > 4)尘埃恒星形成星系的目录的有效方法。这种方法的有效性已经得到了光谱跟踪观测的证实,但是以前可用的星表受到小测量区域的限制。在这里,我们应用基于地图的搜索方法,274度$^2$的赫耳墨斯大模式调查(HeLMS),并创建一个目录的477个对象与SPIRE通量密度$S_{500} > S_{350} >S_{250}$和$5 σ$截止$S_{500} > $ 52毫焦耳。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高出一个数量级。这些结果与以前在较小的HerMES领域的研究结果一致;然而,由于我们的样本量明显较大,我们也能够首次研究红色源计数的形状。我们已经获得了光谱红移测量我们的两个源使用阿塔卡马大型毫米/亚毫米阵列(ALMA)。红移z = 5.1和z = 3.8证实了我们的选择方法确实可以找到高红移的尘埃恒星形成星系。

英文摘要:

Selecting sources with rising flux densities towards longer wavelengths from Herschel/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 HerMES Large Mode Survey (HeLMS) and create a catalogue of 477 objects with SPIRE flux densities $S_{500} > S_{350} >S_{250}$ and a $5 σ$ 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 (ALMA). The redshifts z = 5.1 and z = 3.8 confirm that with our selection method we can indeed find high-redshift dusty star-forming galaxies.

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