ACS近邻星系巡天宝库
摘要
ACS近邻星系巡天宝库（ANGST）是一项系统性巡天，旨在为体积限定的近邻星系样本（D<4 Mpc）建立统一的解析恒星多色测光遗产。巡天体积包含69个星系，处于多样环境中，包括密近对、小群与大群、纤维状结构以及真正孤立区域。这些星系涵盖了几乎完整的形态类型，光度与恒星形成率跨度约10^4倍。巡天数据由HST上的ACS拍摄的图像组成，并辅以存档数据以及ACS故障后新获取的WFPC2成像。巡天图像包括覆盖每个星系完整径向范围的宽场拼接图，以及体积内最大质量星系无拥挤区域的单次深场指向。ANGST中新的宽场成像达到中位50%完备深度：m_F475W=28.0星等，m_F606W=27.3星等，m_F814W=27.3星等，比红巨星支尖端（TRGB）暗几个星等。深场达到足以完全分辨红团簇结构的星等。由此产生的测光星表可公开获取，包含超过3400万次测光测量，对应超过1400万颗恒星。在本文中，我们详细介绍了样本选择、成像、数据处理以及最终测光星表，并分析了ACS和WFPC2成像的测光不确定性（系统性和随机性）。我们还给出了从TRGB视星等统一推导的相对距离。
引用
@article{arxiv.0905.3737,
title = {The ACS Nearby Galaxy Survey Treasury},
author = {Julianne J. Dalcanton and Benjamin F. Williams and Anil C. Seth and Andrew Dolphin and Jon Holtzman and Keith Rosema and Evan D. Skillman and Andrew Cole and Leo Girardi and Stephanie M. Gogarten and Igor D. Karachentsev and Knut Olsen and Daniel Weisz and Charlotte Christensen and Ken Freeman and Karoline Gilbert and Carme Gallart and Jason Harris and Paul Hodge and Roelof S. de Jong and Valentina Karachentseva and Mario Mateo and Peter B. Stetson and Maritza Tavarez and Dennis Zaritsky and Fabio Governato and Thomas Quinn},
journal= {arXiv preprint arXiv:0905.3737},
year = {2009}
}
备注
54 pages, including 24 pages of figures and 16 pages of tables. Project website and data available at http://www.nearbygalaxies.org/ . Data is also available through MAST. Scheduled to appear in the Astrophysical Journal Supplements. (Replaced to fix several figures that were damaged during compression)