Combining Dark Energy Survey Science Verification data with near-infrared data from the ESO VISTA Hemisphere Survey-猫眼课题宝

DOI：

10.1093/mnras/stu2261

发表时间：

2014-07

期刊：

Monthly Notices of the Royal Astronomical Society

影响因子：

4.8

通讯作者：

中科院分区：

物理与天体物理2区

文献类型：

作者：

M. Banerji;S. Jouvel;H. Lin;R. McMahon;O. Lahav;F. Castander;F. Abdalla;E. Bertin;S. Bosman;A. Carnero;M. Kind;L. Costa;D. Gerdes;J. Gschwend;M. Lima;M. Maia;A. Merson;C. Miller;R. Ogando;P. Pellegrini;S. Reed;R. Saglia;C. Sánchez;S. Annis;G. Bernstein;J. Bernstein;R. Bernstein;D. Capozzi;M. Childress;C. Cunha;T. Davis;D. Depoy;S. Desai;H. Diehl;P. Doel;J. Findlay;D. Finley;B. Flaugher;J. Frieman;E. Gaztañaga;K. Glazebrook;C. Gonzalez-Fernandez;E. González-Solares;K. Honscheid;M. Irwin;M. Jarvis;A. Kim;Sergey E. Koposov;K. Kuehn;A. Kupcu-Yoldas;D. Lagattuta;J. Lewis;C. Lidman;M. Makler;J. Marriner;J. Marshall;R. Miquel;J. Mohr;E. Neilsen;J. Peoples;M. Sako;E. Sánchez;V. Scarpine;R. Schindler;M. Schubnell;I. Sevilla;R. Sharp;M. Soares-Santos;M. Swanson;G. Tarlé;J. Thaler;D. Tucker;S. Uddin;Risa Wechsler;W. Wester;F. Yuan;J. Zuntz

我们将暗能量巡天 (DES) 科学验证阶段的光学数据与欧洲南方天文台 VISTA 半球巡天 (VHS) 的近红外 (NIR) 数据相结合。 DES 的深度光学检测用于从较浅的 VHS 数据中提取通量和相关误差。联合七波段 (grizYJK) 光度目录是在以 02h26m-04d36m 为中心的单个 3 平方度专用相机场中生成的，其中辅助多波长光度测定和光谱学的可用性使我们能够测试数据质量。相对于简单的目录级匹配，双光度测量将具有测量的 VHS 通量的 DES 星系数量增加了约 4.5 倍，并导致 NIR 数据的 80% 完整性限制增加了约 1.5 倍。在这个初始目录中，几乎 70% 的 DES 源都有有用的 NIR 通量测量。虽然目前受到少量统计数据的限制，但对具有光谱红移的星系子集的光度红移进行了估计，但初步结果表明 VHS 数据可以帮助减少 z 1 处的光度红移散射。我们提出了 z ~ 0.7 处高红移发光红色星系 (LRG) 以及发光类星体的 DES+VHS 颜色选择标准示例。使用该领域的光谱观测，我们表明，额外的 VHS 通量可以更清晰地选择两个群体，在光谱证实的类星体的情况下，来自银河恒星的污染小于 10%，而在光谱证实的 LRG 的情况下，来自银河恒星的污染小于 0.5%。 DES+VHS 组合数据集最终将覆盖近 5000 平方度，因此将实现一系列新科学，并且非常适合未来广域光谱调查的目标选择。

We present the combination of optical data from the Science Verification phase of the Dark Energy Survey (DES) with near-infrared (NIR) data from the European Southern Observatory VISTA Hemisphere Survey (VHS). The deep optical detections from DES are used to extract fluxes and associated errors from the shallower VHS data. Joint seven-band (grizYJK) photometric catalogues are produced in a single 3 sq-deg dedicated camera field centred at 02h26m-04d36m where the availability of ancillary multiwavelength photometry and spectroscopy allows us to test the data quality. Dual photometry increases the number of DES galaxies with measured VHS fluxes by a factor of ~4.5 relative to a simple catalogue level matching and results in a ~1.5 mag increase in the 80 per cent completeness limit of the NIR data. Almost 70 per cent of DES sources have useful NIR flux measurements in this initial catalogue. Photometric redshifts are estimated for a subset of galaxies with spectroscopic redshifts and initial results, although currently limited by small number statistics, indicate that the VHS data can help reduce the photometric redshift scatter at both z 1. We present example DES+VHS colour selection criteria for high-redshift luminous red galaxies (LRGs) at z ~ 0.7 as well as luminous quasars. Using spectroscopic observations in this field we show that the additional VHS fluxes enable a cleaner selection of both populations with <10 per cent contamination from galactic stars in the case of spectroscopically confirmed quasars and <0.5 per cent contamination from galactic stars in the case of spectroscopically confirmed LRGs. The combined DES+VHS data set, which will eventually cover almost 5000 sq-deg, will therefore enable a range of new science and be ideally suited for target selection for future wide-field spectroscopic surveys.

Combining Dark Energy Survey Science Verification data with near-infrared data from the ESO VISTA Hemisphere Survey

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