Herschel -ATLAS: VISTA VIKING near-infrared counterparts in the Phase 1 GAMA 9-h data ? Herschel-ATLAS: VIKING counterparts
Herschel -ATLAS: VISTA VIKING near-infrared counterparts in the Phase 1 GAMA 9-h data ? Herschel-ATLAS: VIKING counterparts
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Herschel -ATLAS：第一阶段 GAMA 9 小时数据中的 VISTA VIKING 近红外对应物？
DOI：
10.1111/j.1365-2966.2012.21048.x
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发表时间：
2012
影响因子：
4.8
通讯作者：
Fleuren S
中科院分区：
文献类型：
--
作者：
Fleuren S
我们使用Vista Kilo度红外星系(Viking)调查的初步天体目录，确定了与赫歇尔天体物理太赫兹大面积勘测(H-ATLAS)亚毫米(亚毫米)源对应的近红外K-S波段。亚毫米源选自银河系和质量装配9-H场的H-ATLAS第一阶段目录，其中包括在250、350或用仪器探测到的所有物体。我们应用和讨论了一种似然比方法，用于在22000个尖顶震源中搜索半径为10弧秒的维京候选，并具有5σ的探测能力。我们估计，高于北欧海盗调查震级极限的尖顶震源的比例为Q0≈0.73。我们发现11294个(51%)的尖顶震源具有可靠性R≥为0.8%的最佳北欧海盗震源，这些震源的错误识别率估计为4.2%。我们预计会错过5%的真正的维京同行的∼。来自Z−J和J−K S颜色的证据表明，尖顶星系的可靠对应物比外场星系的红度略高。我们获得了∼的光度学红移，其中68%的(非恒星)海盗候选者的红移中位数为。我们有来自现有红移调查的3147个可靠对应物的光谱红移(∼28%)。与第一阶段目录提供的光学识别结果相比，我们发现，使用中深近红外数据将可靠对应物的识别率从36%提高到51%。
We identify near-infrared K s-band counterparts to Herschel Astrophysical Terahertz Large Area Survey (H-ATLAS) submillimetre (submm) sources, using a preliminary object catalogue from the VISTA Kilo-degree Infrared Galaxy (VIKING) survey. The submm sources are selected from the H-ATLAS Phase 1 catalogue of the Galaxy and Mass Assembly 9-h field, which includes all objects detected at 250, 350 or with the instrument. We apply and discuss a likelihood ratio method for VIKING candidates within a search radius of 10 arcsec of the 22 000 SPIRE sources with a 5σ detection at. We estimate the fraction of SPIRE sources with a counterpart above the magnitude limit of the VIKING survey to be Q 0≈ 0.73. We find that 11 294 (51 per cent) of the SPIRE sources have a best VIKING counterpart with a reliability R≥ 0.8, and the false identification rate of these is estimated to be 4.2 per cent. We expect to miss∼ 5 per cent of true VIKING counterparts. There is evidence from Z− J and J− K s colours that the reliable counterparts to SPIRE galaxies are marginally redder than the field population. We obtain photometric redshifts for∼ 68 per cent of all (non-stellar) VIKING candidates with a median redshift of. We have spectroscopic redshifts for 3147 (∼ 28 per cent) of the reliable counterparts from existing redshift surveys. Comparing to the results of the optical identifications supplied with the Phase 1 catalogue, we find that the use of medium-deep near-infrared data improves the identification rate of reliable counterparts from 36 to 51 per cent.