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J/ApJS/180/54   Globular cluster candidates in ACS Virgo survey. (Jordan+, 2009)
The ACS Virgo cluster survey. XVI.
Selection procedure and catalogs of globular cluster candidates.
    Jordan A., Peng E.W., Blakeslee J.P., Cote P., Eyheramendy S.,
    Ferrarese L., Mei S., Tonry J.L., West M.J.
   <Astrophys. J. Suppl. Ser., 180, 54-66 (2009)>
   =2009ApJS..180...54J
ADC_Keywords: Clusters, galaxy ; Photometry, HST ; Clusters, globular

Keywords: catalogs - galaxies: elliptical and lenticular, cD
          galaxies: star clusters - globular clusters: general
          methods: statistical

Abstract:
    We present catalogs of globular cluster candidates for the 100
    galaxies of the Advanced Camera for Surveys Virgo Cluster Survey, a
    large program to carry out imaging of early-type members of the Virgo
    Cluster using the Advanced Camera for Surveys (ACS) on the Hubble
    Space Telescope. We describe the procedure used to select bona fide
    globular cluster candidates out of the full list of detections based
    on model-based clustering methods with the use of expected
    contamination catalogs constructed using blank field observations and
    which are customized for each galaxy. We also present the catalogs of
    expected contaminants for each of our target galaxies. For each
    detected source we measure its position, magnitudes in the F475W
    (∼Sloan g) and F850LP (∼Sloan z) bandpasses, and half-light radii by
    fitting point-spread function convolved King models to the observed
    light distribution. These measurements are presented for 20375
    sources, of which 12763 are likely to be globular clusters. Finally,
    we detail the calculation of the aperture corrections adopted for the
    globular cluster photometry.

Description:
    The ACS Virgo Cluster Survey is a large program to image 100
    early-type galaxies in the Virgo Cluster with the Hubble Space
    Telescope (HST) Advanced Camera for Surveys (ACS).

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table2.dat        62     2400   g-band completeness curves
table3.dat        62     2400   z-band completeness curves
table4.dat       142    12763   Photometric and structural catalog of sources
table5.dat        59   112255   Catalog of expected contaminants


See also:
   J/AJ/90/1681 : The Virgo Cluster Catalog (VCC) (Binggeli+, 1985)
 J/ApJS/153/223 : ACS Virgo Cluster Survey. I (Cote+, 2004)
 J/ApJS/154/509 : ACS Virgo Cluster Survey. II (Jordan+, 2004)
  J/ApJ/613/279 : ACS Virgo Cluster Survey. III M87 (Jordan+, 2004)
 J/ApJS/164/334 : ACS Virgo Cluster Survey. VI (Ferrarese+, 2006)
 J/ApJS/171/101 : ACS Virgo Cluster Survey. XII (Jordan+, 2007)
  J/ApJ/681/197 : ACS Virgo Cluster Survey. XV (Peng+, 2008)


Byte-by-byte Description of file: table2.dat

   Bytes Format Units   Label     Explanations

   1-  6  F6.4  arcsec  rh        Half-light radius
   8- 12  F5.2  mag     gmag      ACS F475W band AB magnitude
  14- 17  F4.2  ---     0.0518    Completeness at background level 0.0518
  19- 22  F4.2  ---     0.1046    Completeness at background level 0.1046
  24- 27  F4.2  ---     0.1491    Completeness at background level 0.1491
  29- 32  F4.2  ---     0.2359    Completeness at background level 0.2359
  34- 37  F4.2  ---     0.4023    Completeness at background level 0.4023
  39- 42  F4.2  ---     0.7175    Completeness at background level 0.7175
  44- 47  F4.2  ---     1.2535    Completeness at background level 1.2535
  49- 52  F4.2  ---     2.1876    Completeness at background level 2.1876
  54- 57  F4.2  ---     3.6955    Completeness at background level 3.6955
  59- 62  F4.2  ---     6.0713    Completeness at background level 6.0713


Byte-by-byte Description of file: table3.dat

   Bytes Format Units   Label     Explanations

   1-  6  F6.4  arcsec  rh        Half-light radius
   8- 12  F5.2  mag     zmag      ACS F850LP band AB magnitude
  14- 17  F4.2  ---     0.0326    Completeness at background level 0.0326
  19- 22  F4.2  ---     0.0917    Completeness at background level 0.0917
  24- 27  F4.2  ---     0.1403    Completeness at background level 0.1403
  29- 32  F4.2  ---     0.2354    Completeness at background level 0.2354
  34- 37  F4.2  ---     0.4044    Completeness at background level 0.4044
  39- 42  F4.2  ---     0.7457    Completeness at background level 0.7457
  44- 47  F4.2  ---     1.3262    Completeness at background level 1.3262
  49- 52  F4.2  ---     2.2897    Completeness at background level 2.2897
  54- 57  F4.2  ---     4.3344    Completeness at background level 4.3344
  59- 62  F4.2  ---     7.6519    Completeness at background level 7.6519


Byte-by-byte Description of file: table4.dat

   Bytes Format Units    Label    Explanations

   1-  4  I4    ---      VCC      Virgo Cluster Catalog number (1)
   6- 16  F11.7 deg      RAdeg    Right Ascension in decimal degrees (J2000) (2)
  18- 27  F10.7 deg      DEdeg    Declination in decimal degrees (J2000) (2)
  29- 35  F7.3  arcsec   GDist    Galactocentric distance
  37- 42  F6.3  mag      zmag     Model ACS F850LP band magnitude (3)
  44- 48  F5.3  mag      e_zmag   Uncertainty in zmag
  50- 55  F6.3  mag      zamag    Average ACS F850LP band correction aperture
                                   magnitude (4)
  57- 61  F5.3  mag      e_zamag  Uncertainty in zamag
  63- 68  F6.3  mag      gmag     Model ACS F475W band magnitude (3)
  70- 74  F5.3  mag      e_gmag   Uncertainty in gmag
  76- 81  F6.3  mag      gamag    Average ACS F475W band correction aperture
                                   magnitude (4)
  83- 87  F5.3  mag      e_gamag  Uncertainty in gamag
  89- 94  F6.4  arcsec   rhz      Best-fit ACS F850LP band half-light radius
  96-101  F6.4  arcsec   e_rhz    Uncertainty in rhz
 103-108  F6.4  arcsec   rhg      Best-fit ACS F475W band half-light radius
 110-115  F6.4  arcsec   e_rhg    Uncertainty in rhg
 117-120  F4.2  ---      pGC      Probability source is a Globular Cluster (5)
 122-126  F5.3  mag      E(B-V)   Foreground E(B-V) assumed (6)
 128-134  F7.4  ct/s     bz       Background ACS F475W band counts
 136-142  F7.4  ct/s     bg       Background ACS F850LP band counts

Note (1): Galaxy ID in the Virgo Cluster Catalogue (Binggeli et al.,
          1985, Cat. J/AJ/90/1681, <VCC NNNN> in Simbad).
          This table present the structural and photometrical catalog of
          all ACSVCS sources that satisfy the selection criteria presented in
          Section 2.6 in Jordan et al., 2004, Cat. J/ApJS/154/509 (Paper II).
          To select a sample of bona-fide GCs the sources should be restricted
          to those having pGC≥0.5.
Note (2): Sources identified as [JPB2009] DDD.ddddddd+DD.ddddddd in Simbad.

Note (3): Obtained from the best-fits PSF convolved King model and an aperture
          correction as per equation 9 (Section 3.1).
Note (4): Inferred from a 0.2" aperture and an aperture correction as per
          equation 10 (Section 3.2).
Note (5): According to the maximum-likelihood estimate of our asumed mixture
          model (see Section 7).
Note (6): E(B-V) taken from the DIRBE maps of Schlegel et al.,
          (1998ApJ...500..525S). The corrections for foreground reddening were
          taken to be Ag=3.634E(B-V) and Az=1.485E(B-V) in the g- and
          z-bands respectively (see Jordan et al., 2004, Cat. J/ApJS/154/509).


Byte-by-byte Description of file: table5.dat

   Bytes Format Units   Label     Explanations

   1-  4  I4    ---     VCC       Virgo Cluster Catalog number (1)
   6- 12  F7.3  arcsec  GDist     Galactocentric distance
  14- 19  F6.3  mag     zmag      Model ACS F850LP band magnitude (2)
  21- 26  F6.3  mag     zamag     Average ACS F475W band correction aperture
                                  magnitude (3)
  28- 33  F6.3  mag     gmag      Model ACS F850LP band magnitude (2)
  35- 40  F6.3  mag     gamag     Average ACS F850LP band correction aperture
                                  magnitude (3)
  42- 47  F6.4  arcsec  rhz       Best-fit ACS F850LP band half-light radius
  49- 54  F6.4  arcsec  rhg       Best-fit ACS F475W band half-light radius
  56- 59  F4.2  ---     pGC       Probability source is a Globular Cluster (4)

Note (1): This table presents the expected contaminants in 17 control fields
          customized to each galaxy. It can be used to infer 17 times the
          expected contamination in any given GC sample.
Note (2): Obtained from the best-fits PSF convolved King model and an aperture
          correction as per equation 9.
Note (3): Inferred from a 0.2" aperture and an aperture correction as per
          equation 10.
Note (4): According to the maximum-likelihood estimate of our asumed mixture
          model (see Section 7).


History:
    From electronic version of the journal

References:
   Cote et al.,      Paper I.    2004ApJS..153..223C, Cat. J/ApJS/153/223
   Jordan et al. ,   Paper II.   2004ApJS..154..509J, Cat. J/ApJS/154/509
   Jordan et al.,    Paper III.  2004ApJ...613..279J, Cat. J/ApJ/613/279
   Mei et al.,       Paper IV.   2005ApJS..156..113M
   Ferrarese et al., Paper VI.   2006ApJS..164..334F, Cat. J/ApJS/164/334
   Hasegan et al.,   Paper VII.  2005ApJ...627..203H
   Cote et al.,      Paper VIII. 2006ApJS..165...57C
   Peng et al.,      Paper IX.   2006ApJ...639...95P
   Jordan et al.,    Paper X.    2005ApJ...634.1002J
   Peng et al.,      Paper XI.   2006ApJ...639..838P
   Jordan et al.,    Paper XII.  2007ApJS..171..101J, Cat. J/ApJS/171/101
   Mei et al.,       Paper XIII. 2007ApJ...655..144M
   Mieske et al.,    Paper XIV.  2006ApJ...653..193M
   Peng et al.,      Paper XV.   2008ApJ...681..197P, Cat. J/ApJ/681/197
(End)                 Greg Schwarz [AAS], Emmanuelle Perret [CDS]    06-Oct-2009