Herschel–ATLAS: counterparts from the ultraviolet–near-infrared in the science demonstration phase catalogue
Herschel–ATLAS: counterparts from the ultraviolet–near-infrared in the science demonstration phase catalogue
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DOI：
10.1111/j.1365-2966.2011.18827.x
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发表时间：
2010-07
影响因子：
4.8
通讯作者：
Daniel J. B. Smith;Daniel J. B. Smith;L. Dunne;S. Maddox;S. Eales;D. Bonfield;M. Jarvis;W. Sutherland-W
中科院分区：
文献类型：
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作者：
Daniel J. B. Smith;Daniel J. B. Smith;L. Dunne;S. Maddox;S. Eales;D. Bonfield;M. Jarvis;W. Sutherland-W
我们提出了一种技术，以确定光学对应的250 μ m选定的来源，从赫歇尔-ATLAS调查。在我们的科学演示目录中的6621个250 μm > 32 mJy的源中，我们发现大约60%的源在斯隆数字巡天中的亮度超过r = 22.4等。应用似然比技术，我们能够确定2423个对应的可靠性R > 0.8。这大约是全部250 μm目录的37%。我们估计了这2423个可靠对应物的光度红移，而1099个也有来自几个不同来源的光谱红移，包括GAMA调查。我们估计的完整性，确定对应物作为红移的函数，并提出证据表明，250 μ m选定的赫歇尔-ATLAS星系有一个双峰红移分布。那些具有可靠光学识别的红移分布峰值为z ≈ 0.25 ± 0.05，而亚毫米颜色表明，在r波段极限以上没有对应物的显着部分具有z > 1。我们还提出了一种选择强透镜高红移星系种群的方法。我们的鉴定与GAMA调查的UV-NIR光度测定相匹配，这些数据可作为Herschel-ATLAS公共数据发布的一部分。
We present a technique to identify optical counterparts of 250-μm-selected sources from the Herschel–ATLAS survey. Of the 6621 250 μm > 32-mJy sources in our science demonstration catalogue we find that ∼60 per cent have counterparts brighter than r = 22.4 mag in the Sloan Digital Sky Survey. Applying a likelihood ratio technique we are able to identify 2423 of the counterparts with a reliability R > 0.8. This is approximately 37 per cent of the full 250-μm catalogue. We have estimated photometric redshifts for each of these 2423 reliable counterparts, while 1099 also have spectroscopic redshifts collated from several different sources, including the GAMA survey. We estimate the completeness of identifying counterparts as a function of redshift, and present evidence that 250-μm-selected Herschel–ATLAS galaxies have a bimodal redshift distribution. Those with reliable optical identifications have a redshift distribution peaking at z ≈ 0.25 ± 0.05, while submillimetre colours suggest that a significant fraction with no counterpart above the r-band limit have z > 1. We also suggest a method for selecting populations of strongly lensed high-redshift galaxies. Our identifications are matched to UV–NIR photometry from the GAMA survey, and these data are available as part of the Herschel–ATLAS public data release.