UltraVISTA: a new ultra-deep near-infrared survey in COSMOS
UltraVISTA: a new ultra-deep near-infrared survey in COSMOS
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DOI：
10.1051/0004-6361/201219507
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发表时间：
2012-08-01
影响因子：
6.5
通讯作者：
Zabl, J.
中科院分区：
文献类型：
--
作者：
McCracken, H. J.;Milvang-Jensen, B.;Zabl, J.
在本文中，我们描述了 COSMOS 领域 UltraVISTA 近红外成像勘测的首次数据发布。我们总结了调查的主要目标和设计，并详细描述了我们的数据缩减技术。我们提供 YJHK 中的堆叠天空扣除图像以及根据 UltraVISTA 观测第一年收集的数据构建的窄带滤波器。我们的叠加图像在 2 英寸直径的孔径中达到 5 sigma AB 深度，Y 波段类似于 25，JHK 波段类似于 24，并且所有图像都具有亚角秒视宁度。对于这个 5 秒的限制，我们的 K-s 目录包含 216 268 个源。我们对我们的图像和目录进行一系列质量评估测试，将我们的堆栈与现有目录进行比较。与公开可用的 COSMOS ACS 目录相比，选择 17.0 < K-s(AB) < 19.5 的恒星在两个方向上的 1 sigma 天体测量 rms 类似于 0.08 ''。我们的图像被重新采样到与公开可用的 COSMOS 数据相同的像素尺度和切点，因此可以轻松地使用该数据生成多色目录。本文中提供的所有图像和目录均可通过 ESO 的“第 3 阶段”归档和分发系统以及 UltraVISTA 网站公开获取。
In this paper we describe the first data release of the UltraVISTA near-infrared imaging survey of the COSMOS field. We summarise the key goals and design of the survey and provide a detailed description of our data reduction techniques. We provide stacked, sky-subtracted images in YJHK(s) and narrow-band filters constructed from data collected during the first year of UltraVISTA observations. Our stacked images reach 5 sigma AB depths in an aperture of 2 '' diameter of similar to 25 in Y and similar to 24 in JHK(s) bands and all have sub-arcsecond seeing. To this 5s limit, our K-s catalogue contains 216 268 sources. We carry out a series of quality assessment tests on our images and catalogues, comparing our stacks with existing catalogues. The 1 sigma astrometric rms in both directions for stars selected with 17.0 < K-s(AB) < 19.5 is similar to 0.08 '' in comparison to the publicly-available COSMOS ACS catalogues. Our images are resampled to the same pixel scale and tangent point as the publicly available COSMOS data and so may be easily used to generate multi-colour catalogues using this data. All images and catalogues presented in this paper are publicly available through ESO's "phase 3" archiving and distribution system and from the UltraVISTA web site.