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J/AJ/108/2087           Globular Clusters in Ellipticals           (Ajhar+ 1994)
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VRI Photometry of Globular Clusters in Virgo and Leo Ellipticals
     Ajhar E.A., Blakeslee J.P., Tonry J.L.
    <Astron. J. 108, 2087 (1994)>
    =1994AJ....108.2087A
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ADC_Keywords: Galaxies, optical; Clusters, globular; Photometry  

Abstract:
  We present VRI photometry for the globular cluster systems (GCS's) of
  ten elliptical and S0 galaxies in Virgo and Leo.  We find that the V-I
  color (metallicity) distributions are quite different from galaxy to
  galaxy.  One extreme is represented by NGC 4374 with a narrow, blue
  distribution.  NGC 4472 has a very broad, uniform distribution in
  color, corresponding to -1.8 < [Fe/H] < +0.47.  At the other extreme is
  NGC 4365, which is weighted towards red colors, and possibly has a
  peculiar luminosity function.  We suggest that this variation of GCS
  metallicity depends on environment, with formation of high metallicity
  globular clusters inhibited in higher density environments.  We compare
  color-color plots of the GCS's of these galaxies with the Milky Way GCS
  and with integrated isochrones.  We find good agreement with the
  galaxies studied here except that the isochrones predict colors which
  are slightly too bright in the I band for metal-rich clusters.  We also
  consider the radial GC color distributions in these galaxies.  We find
  evidence for a V-I color gradient only in NGC 4374, in the sense of
  redder clusters toward the center of the galaxy but warn that possible
  systematic effects must be ruled out with the new data.  Lastly, using
  the surface brightness fluctuation distances to these galaxies, we find
  supporting evidence for the universality of the globular cluster
  luminosity function.

Description:
  Tables 3-12 contain the positions, radial distances, magnitudes, and
  colors of objects located for each galaxy.  Only objects brighter
  than R=22 and classified by DOPHOT as point sources in the V, R, and
  I images are included in the tables.  The positions are in arcseconds
  and are relative to the center of the galaxy such that +x is to the
  west and +y is to the north.  The magnitude and colors of each object
  have been corrected for reddening and absorption according to
  Equation (1) of the paper and following the values listed in Table 2
  of the paper.  Please use those values to recover the actual apparent
  magnitudes of these objects if desired.


File Summary:
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 FileName    Lrecl    Records   Explanations
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ReadMe          80          .   This file
table3.dat      41         60   NGC 3379
table4.dat      41        142   NGC 4365
table5.dat      41        119   NGC 4374
table6.dat      41        105   NGC 4406
table7.dat      41         29   NGC 4458
table8.dat      41         21   NGC 4468
table9.dat      41        170   NGC 4472
table10.dat     41         16   NGC 4489
table11.dat     41        127   NGC 4552
table12.dat     41         26   NGC 4578
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Byte-by-byte Description of file: *.dat
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   Bytes Format  Units    Label      Explanations
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   1- 3   I3      ---     ID         Identification number
   4-10   F7.1    arcsec  Xpos       X position relative to center of galaxy
  11-17   F7.1    arcsec  Ypos       Y position relative to center of galaxy
  18-23   F6.1    arcsec  Dist       Radial distance
  24-29   F6.2    mag     Rmag       R magnitude
  30-35   F6.3    mag     V-R        V-R color
  36-41   F6.3    mag     R-I        R-I color
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Origin: AAS CD-ROM series, Volume 4, 1995         Lee Brotzman [ADS] 24-Apr-1995
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(End)                                                         [CDS]  10-Jul-1995