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J/AJ/135/1858 Old globular clusters in dwarf irregular galaxies (Georgiev+ 2008)
Old globular clusters in Magellanic-type dwarf irregular galaxies.
    Georgiev I.Y., Goudfrooij P., Puzia T.H., Hilker M.
   <Astron. J., 135, 1858-1876 (2008)>
   =2008AJ....135.1858G
ADC_Keywords: Galaxies, nearby ; Clusters, globular ; Photometry ; Morphology

Keywords: galaxies: dwarf - galaxies: irregular - galaxies: stellar content -
          globular clusters: general

Abstract:
    We have performed a search for old globular clusters (GCs) using
    archival F606W and F814W Hubble Space Telescope/Advanced Camera for
    Surveys images of 19 Magellanic-type dwarf Irregular (dIrr) galaxies.
    Those dIrrs reside in nearby (2-8Mpc) associations of dwarf galaxies
    only. All dIrrs have absolute magnitudes fainter than or equal to that
    of the SMC (MV=-16.2mag). We detect in total 50 GC candidates in
    13 dIrrs, of which 37 have (V-I) colors consistent with "blue"
    (old, metal-poor) GCs (bGCs). The luminosity function (LF) of the bGC
    candidates in our sample shows a turnover magnitude of
    MV=-7.41±0.22mag, consistent with other galaxy types.

Description:
    The current study uses Hubble Space Telescope HST archival data of 20
    Magellanic-type dIrr galaxies located in nearby (d=3-8Mpc) loose
    groups (associations) of dwarf galaxies (Tully et al.,
    2006AJ....132..729T). They were observed in the F606W and F814W
    filters with HST/Advanced Camera for Surveys (ACS) during Cycle 13,
    program GO-10210 (PI: B. Tully).

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table3.dat       113       60  *General properties of the GC candidates in the
                              studied dwarf irregular galaxies

Note on table3.dat: According to the colors of the GC candidates, they are
     separated with lines on blue, red and likely background contamination
     sub-populations.


See also:
 J/MNRAS/392/879  : Globular cluster in nearby dwarf galaxies (Georgiev+, 2009)
 J/MNRAS/396/1075 : Globular cluster in nearby dwarf gal. II (Georgiev+, 2009)


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

   Bytes Format Units   Label      Explanations

   1- 12  A12   ---     [GGP2008]  Globular cluster candidate name
  15- 22  F8.3  pix     Xpos       X position
  24- 30  F7.2  pix     Ypos       Y position
  32- 33  I2    h       RAh        Right ascension (J2000)
  35- 36  I2    min     RAm        Right ascension (J2000)
  38- 42  F5.2  s       RAs        Right ascension (J2000)
      44  A1    ---     DE-        Declination sign (J2000)
  45- 46  I2    deg     DEd        Declination (J2000)
  48- 49  I2    arcmin  DEm        Declination (J2000)
  51- 55  F5.2  arcsec  DEs        Declination (J2000)
  57- 61  F5.2  mag     VMAG0      Deredenned absolute V magnitude
  63- 66  F4.2  mag     e_VMAG0    rms uncertainty on VMAG0
  68- 71  F4.2  mag     (V-I)0     Deredenned V-I colour index
  73- 76  F4.2  mag     e_(V-I)0   rms uncertainty on (V-I)0
  78- 82  F5.2  pix     rhpix      Half-light radius in pixel
  84- 87  F4.2  pix     e_rhpix    rms uncertainty on rhpix
  89- 93  F5.2  pc      rh         Half-light radius in pc
  95- 98  F4.2  pc      e_rh       rms uncertainty on rh
 100-103  F4.2  ---     ell        Ellipticity
 105-108  F4.2  kpc     d.p        Projected distance from galaxy center
 110-113  F4.2  ---     d.p/r      Projected distance normalized to the
                                    effective galaxy radius


History:
    From electronic version of the journal
(End)                                      Patricia Vannier [CDS]    09-Feb-2010