/ftp/cats/aliases/P/PHAT_1_



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J/ApJ/752/95       PHAT stellar cluster survey. I. Year 1       (Johnson+, 2012)
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Beginning of ReadMe : J/ApJ/752/95 PHAT stellar cluster survey. I. Year 1 (Johnson+, 2012) ================================================================================ PHAT stellar cluster survey. I. Year 1 catalog and integrated photometry. Johnson L.C., Seth A.C., Dalcanton J.J., Caldwell N., Fouesneau M., Gouliermis D.A., Hodge P.W., Larsen S.S., Olsen K.A.G., San Roman I., Sarajedini A., Weisz D.R., Williams B.F., Beerman L.C., Bianchi L., Dolphin A.E., Girardi L., Guhathakurta P., Kalirai J., Lang D., Monachesi A., Nanda S., Rix H.-W., Skillman E.D. <Astrophys. J., 752, 95 (2012)> =2012ApJ...752...95J ================================================================================ ADC_Keywords: Photometry, HST ; Clusters, globular ; Surveys ; Galaxies, optical Keywords: catalogs; galaxies: individual: M31; galaxies: star clusters: general Abstract: The Panchromatic Hubble Andromeda Treasury (PHAT) survey is an ongoing Hubble Space Telescope (HST) multi-cycle program to obtain high spatial resolution imaging of one-third of the M31 disk at ultraviolet through near-infrared wavelengths. In this paper, we present the first installment of the PHAT stellar cluster catalog. When completed, the PHAT cluster catalog will be among the largest and most comprehensive surveys of resolved star clusters in any galaxy. The exquisite spatial resolution achieved with HST has allowed us to identify hundreds of new clusters that were previously inaccessible with existing ground-based surveys. We identify 601 clusters in the Year 1 sample, representing more than a factor of four increase over previous catalogs within the current survey area (390 arcmin^2^). This work presents results derived from the first  25% of the survey data; we estimate that the final sample will include  2500 clusters. For the Year 1 objects, we present a catalog with positions, radii, and six-band integrated photometry. Along with a general characterization of the cluster luminosities and colors, we discuss the cluster luminosity function, the cluster size distributions, and highlight a number of individually interesting clusters found in the Year 1 search. Description: This paper includes clusters identified in Year 1 PHAT (Panchromatic Hubble Andromeda Treasury) imaging data, taken before 2011 June. A full description of the PHAT observational design is available in Dalcanton et al. (2012ApJS..200...18D), but we briefly summarize relevant details below. PHAT observations are grouped into 23 area units known as "bricks," each made up of 18 mosaiced HST fields of view in a rectangular 6x3 arrangement that covers a  12'x6.5' region of sky. Data are obtained simultaneously at different field centers with the Advanced Camera for Surveys (ACS; using the F475W and F814W filters) and Wide Field Camera 3 (WFC3; using the F275W, F336W, F110W, and F160W filters) instruments in two epochs, separated by  6 months. The Year 1 imaging used in this work includes four full bricks (designated B01, B09, B15, and B21) and the western halves of two additional bricks (B17W and B23W). These data sample locations along the major axis of M31 from the center out to a projected radius of  20kpc (see Figure 2). See section 2 for further details.