The acs nearby galaxy survey treasury

Julianne J. Dalcanton, Benjamin F. Williams, Anil C. Seth, Andrew Dolphin, Jon Holtzman, Keith Rosema, Evan D Skillman, Andrew Cole, Léo Girardi, Stephanie M. Gogarten, Igor D. Karachentsev, Knut Olsen, Daniel Weisz, Charlotte Christensen, Ken Freeman, Karoline Gilbert, Carme Gallart, Jason Harris, Paul Hodge, Roelof S. De JongValentina Karachentseva, Mario Mateo, Peter B. Stetson, Maritza Tavarez, Dennis Zaritsky, Fabio Governato, Thomas Quinn

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The ACS Nearby Galaxy Survey Treasury (ANGST) is a systematic survey to establish a legacy of uniform multi-color photometry of resolved stars for a volume-limited sample of nearby galaxies (D < 4 Mpc). The survey volume encompasses 69 galaxies in diverse environments, including close pairs, small and large groups, filaments, and truly isolated regions. The galaxies include a nearly complete range of morphological types spanning a factor of 104 in luminosity and star formation rate. The survey data consist of images taken with the Advanced Camera for Surveys (ACS) on the Hubble Space Telescope (HST), supplemented with archival data and new Wide Field Planetary Camera 2 (WFPC2) imaging taken after the failure of ACS. Survey images include wide field tilings covering the full radial extent of each galaxy, and single deep pointings in uncrowded regions of the most massive galaxies in the volume. The new wide field imaging in ANGST reaches median 50% completenesses of m F475W = 28.0mag, m F606W = 27.3mag, and m F814W = 27.3mag, several magnitudes below the tip of the red giant branch (TRGB). The deep fields reach magnitudes sufficient to fully resolve the structure in the red clump. The resulting photometric catalogs are publicly accessible and contain over 34 million photometric measurements of >14 million stars. In this paper we present the details of the sample selection, imaging, data reduction, and the resulting photometric catalogs, along with an analysis of the photometric uncertainties (systematic and random), for both ACS and WFPC2 imaging. We also present uniformly derived relative distances measured from the apparent magnitude of the TRGB.

Original languageEnglish (US)
Pages (from-to)67-108
Number of pages42
JournalAstrophysical Journal, Supplement Series
Issue number1
StatePublished - 2009


  • Catalogs
  • Galaxies: formation
  • Galaxies: stellar content
  • Surveys


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