SEDS: THE SPITZER EXTENDED DEEP SURVEY. SURVEY DESIGN, PHOTOMETRY, AND DEEP IRAC SOURCE COUNTS
SEDS: THE SPITZER EXTENDED DEEP SURVEY. SURVEY DESIGN, PHOTOMETRY, AND DEEP IRAC SOURCE COUNTS
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DOI：
10.1088/0004-637x/769/1/80
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发表时间：
2013-05
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通讯作者：
M. Ashby;S. Willner;G. Fazio;J.-S. Huang;R. Arendt;P. Barmby;G. Barro;E. Bell;R. Bouwens
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作者：
M. Ashby;S. Willner;G. Fazio;J.-S. Huang;R. Arendt;P. Barmby;G. Barro;E. Bell;R. Bouwens
斯皮策扩展深度巡天（英语：Spitzer Extended Deep Survey，缩写：SEDS）是一个非常深的红外巡天，在五个著名的河外科学领域内进行：UKIDSS超深巡天、扩展钱德拉深场南、宇宙、哈勃深场北和扩展格罗斯带。SEDS在3.6和4.5 μm的两个暖红外阵列相机（IRAC）波段中覆盖总面积为1.46 deg 2，深度为26 AB mag（3σ）。由于它在如此多的广泛分离的领域的覆盖深度一致，SEDS受到大约25%的误差小，由于宇宙方差比一个单一的领域调查相同的大小。SEDS的设计目的是探测和表征从中等到高红移（z = 2-7）的星系，并内置评估宇宙方差对各个领域影响的方法。由于SEDS的完整深度是在对每个区域进行至少三次单独访问时积累的，通常访问间隔为六个月，因此SEDS还提供了评估微弱物体红外变化的机会。本文介绍了SEDS的调查设计，处理和公开提供的数据产品。SEDS探测到的超过30万个星系的深IRAC计数与基于已知星系群的模型一致。离散的IRAC源在3.6和4.5 μm处对漫射宇宙红外背景（CIB）的贡献分别为5.6 ± 1.0和4.4 ± 0.8 nW m−2 sr−1。IRAC源不能贡献超过DIRBE数据估计的总CIB通量的一半。除非DIRBE通量估计中出现意外误差，否则一半的CIB通量必须来自扩散分量。
The Spitzer Extended Deep Survey (SEDS) is a very deep infrared survey within five well-known extragalactic science fields: the UKIDSS Ultra-Deep Survey, the Extended Chandra Deep Field South, COSMOS, the Hubble Deep Field North, and the Extended Groth Strip. SEDS covers a total area of 1.46 deg2 to a depth of 26 AB mag (3σ) in both of the warm Infrared Array Camera (IRAC) bands at 3.6 and 4.5 μm. Because of its uniform depth of coverage in so many widely-separated fields, SEDS is subject to roughly 25% smaller errors due to cosmic variance than a single-field survey of the same size. SEDS was designed to detect and characterize galaxies from intermediate to high redshifts (z = 2–7) with a built-in means of assessing the impact of cosmic variance on the individual fields. Because the full SEDS depth was accumulated in at least three separate visits to each field, typically with six-month intervals between visits, SEDS also furnishes an opportunity to assess the infrared variability of faint objects. This paper describes the SEDS survey design, processing, and publicly-available data products. Deep IRAC counts for the more than 300,000 galaxies detected by SEDS are consistent with models based on known galaxy populations. Discrete IRAC sources contribute 5.6 ± 1.0 and 4.4 ± 0.8 nW m−2 sr−1 at 3.6 and 4.5 μm to the diffuse cosmic infrared background (CIB). IRAC sources cannot contribute more than half of the total CIB flux estimated from DIRBE data. Barring an unexpected error in the DIRBE flux estimates, half the CIB flux must therefore come from a diffuse component.