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J/ApJ/475/445       VIK photometry of faint field galaxies (Moustakas+ 1997)
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Colors and K-band counts of extremely faint field galaxies.
       Moustakas L.A., Davis M., Graham J.R., Silk J., Peterson B.A., Yoshii Y.
      <Astrophys. J. 475, 445 (1997)>
      =1997ApJ...475..445M      (SIMBAD/NED BibCode)
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ADC_Keywords: Galaxies, photometry ; Photometry, infrared
Keywords: cosmology: observations - galaxies: evolution - galaxies: photometry -
          galaxies: statistics - infrared: galaxies

Abstract:
    We combine deep K-band (W. M. Keck Telescope) with V- and I-band
    (New Technology Telescope) observations of two "blank" high Galactic
    latitude fields, surveying a total of ~2arcmin^2^. The K-band
    number-magnitude counts continue to rise above K~22mag, reaching
    surface densities of few x10^5^deg^-2^. The slope for the galaxy
    counts is approximately [dlog(N)/dmag].deg^-2^=0.23+/-0.02 over the
    range 18-23mag. While this slope is consistent with other recent deep
    K-band surveys, there is a definite scatter in the normalisations by
    about a factor of 2. In particular, our normalisation is ~2x greater
    than the galaxy counts reported by Djorgovski et al. in 1995
    (1995ApJ...438L..13D). Optical near-infrared color-magnitude and
    color-color diagrams for all objects detected in the V+I+K image are
    plotted and discussed in the context of grids of Bruzual-Charlot
    isochrone synthesis galaxy evolutionary models. The colors of most of
    the observed galaxies are consistent with a population drawn from a
    broad redshift distribution. A few galaxies at K~19-20 are red in both
    colors (V-I>3; I-K>2, consistent with being early-type galaxies having
    undergone a burst of star formation at z>5 and viewed at z~1. At K>20,
    we find several (approximately eight) "red outlier" galaxies with
    I-K>4 and V-I<2.5, whose colors are difficult to mimic by a single
    evolving or nonevolving stellar population at any redshift unless they
    either have quite low metallicity or are highly reddened. We compare
    the data against the evolutionary tracks of second-burst ellipticals
    and against a grid of models that does not constrain galaxy ages to a
    particular formation redshift. The red outliers' surface density is
    several per square arcminute, which is so high that they are probably
    common objects of low luminosity L<L*. Whether these are
    low-metallicity, dusty dwarf galaxies, or old galaxies at high
    redshift, they are curious and merit spectroscopic follow-up.

File Summary:
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  FileName        Lrecl  Records   Explanations
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ReadMe             80        .   This file
table4.dat         57      116   Object catalog for field I
table5.dat         57      111   Object catalog for field II
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Byte-by-byte Description of file: table4.dat table5.dat
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   Bytes Format Units   Label     Explanations
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   1-  2  I2    h       RAh       Right ascension (1950)
   4-  5  I2    min     RAm       Right ascension (1950)
   7- 11  F5.2  s       RAs       Right ascension (1950)
      14  A1    ---     DE-       Declination sign
  15- 16  I2    deg     DEd       Declination (1950)
  18- 19  I2    arcmin  DEm       Declination (1950)
  21- 25  F5.2  arcsec  DEs       Declination (1950)
  28- 32  F5.1  arcsec  xpos      X position (1)
  35- 39  F5.1  arcsec  ypos      Y position (1)
  42- 45  F4.1  mag     Vmag      V magnitude (2)
  48- 51  F4.1  mag     Imag      I magnitude (2)
  54- 57  F4.1  mag     Kmag      K magnitude
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Note (1): North is up, East is left.
Note (2): When the magnitude is '0.0', no reliable value.
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History: Prepared via OCR at CDS.
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(End)                           James Marcout, Patricia Bauer [CDS]  24-Oct-1997