Colour matters: the effects of lensing on the positional offsets between optical and submillimetre galaxies in Herschel★-ATLAS
Colour matters: the effects of lensing on the positional offsets between optical and submillimetre galaxies in Herschel★-ATLAS
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颜色很重要：透镜效应对赫歇尔★-ATLAS中光学星系和亚毫米星系之间位置偏移的影响
DOI：
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
K. Rowlands
中科院分区：
文献类型：
--
作者：
N. Bourne;N. Bourne;S. Maddox;S. Maddox;L. Dunne;L. Dunne;S. Dye;S. Eales;C. Hoyos;C. Hoyos;J. González;D. Smith;E. Valiante;G. Zotti;G. Zotti;R. Ivison;K. Rowlands
我们报告了赫歇尔天体物理太赫兹大面积巡天（H-ATLAS）亚毫米（submm）源和它们的光学关联之间的位置偏移分布的意外变化，这取决于250 μm信噪比和250/350 μm颜色。我们发现，更红，更亮的submm源具有更广泛的位置偏移分布比预期的光学关联，如果这些偏移是由于随机的位置误差在源提取。观察结果可以解释为两种可能的影响：要么红色submm源跟踪一个更集群的人口比蓝色的，他们的位置误差增加的混乱，或红色submm源通常是在高红移，并经常与低红移透镜结构被确定为虚假的同行。我们进行各种分析的数据，包括光学协会的多样性，在H-ATLAS的红移和幅度分布相比，爱马仕，和模拟弱透镜，我们得出的结论是，影响是最有可能被解释为广泛的弱透镜的赫歇尔-SPIRE源的前景结构。这对对应物的识别和亚毫米巡天的红移分布和光度函数有重要的影响。
We report an unexpected variation in the positional offset distributions between Herschel-Astrophysical Terahertz Large Area Survey (H-ATLAS) submillimetre (submm) sources and their optical associations, depending on both 250-μm signal-to-noise ratio and 250/350-μm colour. We show that redder and brighter submm sources have optical associations with a broader distribution of positional offsets than would be expected if these offsets were due to random positional errors in the source extraction. The observation can be explained by two possible effects: either red submm sources trace a more clustered population than blue ones, and their positional errors are increased by confusion, or red submm sources are generally at high redshifts and are frequently associated with low-redshift lensing structures which are identified as false counterparts. We perform various analyses of the data, including the multiplicity of optical associations, the redshift and magnitude distributions in H-ATLAS in comparison to HerMES, and simulations of weak lensing, and we conclude that the effects are most likely to be explained by widespread weak lensing of Herschel-SPIRE sources by foreground structures. This has important consequences for counterpart identification and derived redshift distributions and luminosity functions of submm surveys.
斯隆数字巡天第十次数据发布：来自 SDSS-III 阿帕奇点天文台银河演化实验的首个光谱数据
DOI：
10.1088/0067-0049/211/2/17
发表时间：
2014
期刊：
The Astrophysical Journal Supplement Series
影响因子：
--
作者：
Ahn C
通讯作者：
Ahn C
影响因子：
3.5
作者：
S. Eales;L. Dunne;D. Clements;A. Cooray;G. Zotti;S. Dye;R. Ivison;M. Jarvis;G. Lagache
通讯作者：
S. Eales;L. Dunne;D. Clements;A. Cooray;G. Zotti;S. Dye;R. Ivison;M. Jarvis;G. Lagache