伯奇-欧文星系巡天。I.光学图像概述与图集
The Carnegie-Irvine Galaxy Survey. I. Overview and Atlas of Optical Images
摘要：
CGS是一个长期的计划，利用Las Campanas天文台的设施，对605个明亮（B_T < 12.9等）的南部（12月< 0日）星系的光度和光谱特性进行研究。本文是系列文章中的第一篇，概述了CGS的科学动机，定义了样本，并描述了调查的光学宽带（BVRI）成像组件的技术方面，包括观测程序，数据简化程序和校准策略的细节。图像的整体质量相当高，在分辨率（中值视宁度1”），视野（8.9' X 8.9'）和深度（中值限制表面亮度27.5，26.9，26.4和25.3 mag/arcsec 2在B，V，R和I波段，分别）方面。我们准备了一个数字图像图集，显示了几种不同的数据，包括三色合成，恒星清洁图像，堆叠图像，以提高微弱的功能，结构图，以突出小规模的功能，和颜色指数图适合研究恒星内容和尘埃的空间变化。在即将到来的科学分析的预期中，我们列出了星系样本的一组广泛的全球性质。这些包括来自CGS本身的光学等照度线和测光参数，以及多波长（紫外，U-波段，近红外，远红外）测光，内部运动学（中心恒星速度色散，磁盘旋转速度），环境（距离最近的邻居，潮汐参数，组或集群成员）和H I内容的公开信息。数字图像和科学级数据产品将向社区公开。
英文摘要：
The Carnegie-Irvine Galaxy Survey (CGS) is a long-term program to investigate the photometric and spectroscopic properties of a statistically complete sample of 605 bright (B_T < 12.9 mag), southern (Dec. < 0) galaxies using the facilities at Las Campanas Observatory. This paper, the first in a series, outlines the scientific motivation of CGS, defines the sample, and describes the technical aspects of the optical broadband (BVRI) imaging component of the survey, including details of the observing program, data reduction procedures, and calibration strategy. The overall quality of the images is quite high, in terms of resolution (median seeing 1"), field of view (8.9' X 8.9'), and depth (median limiting surface brightness 27.5, 26.9, 26.4, and 25.3 mag/arcsec2 in the B, V, R, and I bands, respectively). We prepare a digital image atlas showing several different renditions of the data, including three-color composites, star-cleaned images, stacked images to enhance faint features, structure maps to highlight small-scale features, and color index maps suitable for studying the spatial variation of stellar content and dust. In anticipation of upcoming science analyses, we tabulate an extensive set of global properties for the galaxy sample. These include optical isophotal and photometric parameters derived from CGS itself, as well as published information on multiwavelength (ultraviolet, U-band, near-infrared, far-infrared) photometry, internal kinematics (central stellar velocity dispersions, disk rotational velocities), environment (distance to nearest neighbor, tidal parameter, group or cluster membership), and H I content. The digital images and science-level data products will be made publicly accessible to the community.
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