NEWFIRM中波段巡天：z~3外的光度星表、红移和双峰色分布
The NEWFIRM Medium-band Survey: Photometric Catalogs, Redshifts and the Bimodal Color Distribution of Galaxies out to z~3
摘要：
我们提出了深近红外（NIR）中带宽测光在波长范围1-1.8微米的全波长扩展的增长带国际巡天（AEGIS）和宇宙演化巡天（COSMOS）领域。这些观测是作为NEWFIRM中波段调查（NMBS）的一部分进行的，这是NOAO在基特峰的Mayall 4米望远镜上使用NOAO极宽视场红外成像仪（NEWFIRM）进行的调查计划。在本文中，我们描述了完整的细节的观测，数据处理和测光的调查。我们还提出了一个公开的K-选择光度表，以及精确的光度红移。红移是用COSMOS（AEGIS）场中的37（20）个滤波器计算的，将近红外中等带宽数据与现有的紫外（UV;银河演化探测器），可见光和近红外（加拿大-法国-夏威夷望远镜和斯巴鲁）和中红外（斯皮策/IRAC）成像相结合。我们发现与公开的光谱红移非常吻合，在z=0-3时，约4000个星系的sigma_z/（1+z）约为1-2%。NMBS星表包含约13，000个z>1.5的星系，具有精确的光度红移和静止坐标系颜色。由于五个近红外中波段滤光片获得的光谱分辨率增加，当比较中波段近红外测光表和近红外宽带测光表时，静止星系和恒星形成星系的测光红移的中值68%置信区间小了约2倍。我们发现了在静止星系和恒星形成星系之间存在明显的双峰色分布的证据，这种双峰色分布持续到z~3，比迄今为止探测到的红移更高。
英文摘要：
We present deep near-infrared (NIR) medium-bandwidth photometry over the wavelength range 1-1.8 microns in the All-wavelength Extended Groth strip International Survey (AEGIS) and Cosmic Evolution Survey (COSMOS) fields. The observations were carried out as part of the NEWFIRM Medium-Band Survey (NMBS), an NOAO survey program on the Mayall 4m telescope on Kitt Peak using the NOAO Extremely Wide-Field Infrared Imager (NEWFIRM). In this paper, we describe the full details of the observations, data reduction and photometry for the survey. We also present a public K-selected photometric catalog, along with accurate photometric redshifts. The redshifts are computed with 37 (20) filters in the COSMOS (AEGIS) fields, combining the NIR medium-bandwidth data with existing ultraviolet (UV; Galaxy Evolution Explorer), visible and NIR (Canada-France-Hawaii Telescope and Subaru) and mid-IR (Spitzer/IRAC) imaging. We find excellent agreement with publicly available spectroscopic redshifts, with sigma_z/(1+z)~1-2% for ~4000 galaxies at z=0-3. The NMBS catalogs contain ~13,000 galaxies at z>1.5 with accurate photometric redshifts and rest-frame colors. Due to the increased spectral resolution obtained with the five NIR medium-band filters, the median 68% confidence intervals of the photometric redshifts of both quiescent and star-forming galaxies are a factor of ~2 times smaller when comparing catalogs with medium-band NIR photometry to NIR broadband photometry. We show evidence for a clear bimodal color distribution between quiescent and star-forming galaxies that persists to z~3, a higher redshift than has been probed so far.
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