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J/ApJ/405/498   Counts and spectral indices at 8.44GHz (Windhorst+, 1993)
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Microjansky source counts and spectral indices at 8.44 GHz
       Windhorst R.A., Fomalont E.B., Partridge R.B., Lowenthal J.D.
      <Astrophys. J. 405, 498 (1993)>
      =1993ApJ...405..498W      (SIMBAD/NED Reference)
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ADC_Keywords: Regional catalog; Radio sources
Keywords: cosmic microwave background - galaxies: evolution -
          galaxies: starburst - radio continuum: galaxies - surveys

Description:
    We used the VLA to make deep images of two 7x7' fields at 8.44 GHz
    with 10" resolution. With an rms noise of 3.2 and 5.1 {micro}Jy,
    respectively, in the two fields, we compiled a catalog of 82 sources.
    The normalized differential 8.44 GHz counts are similar to those at
    1.41 and 4.86 GHz. All show a similarly steep submillijansky slope,
    which is only somewhat flatter than that expected for a nonevolving
    Euclidean population ({gamma}=2.5).
    Microjansky radio sources at 4.86 GHz have been identified with faint
    blue galaxies (18<~V<~28 mag). We argue that their expected median
    redshift is about 0.5-0.75. Hence, cosmological evolution may be
    needed to explain the steep slope of the microjansky counts. The 
    8.44 GHz counts must converge with slope {gamma}<2.0 below S(8.44)~300
    nJy, or they would exceed the available field galaxy counts down to
    V~28 mag, and they must permanently converge below S(8.44)~20 nJy, or
    their integrated sky brightness would distort the observed thermal
    cosmic background radiation spectrum at centimeter wavelengths. The
    estimated 31.5 GHz sky brightness from nanojansky to jansky levels is
    <36 {micro}K (3{sigma}). Even if weak radio sources cluster on scales
    of degrees as faint galaxies do, their anisotropic contribution to the
    COBE DMR experiment (with 7deg FWHM-beam) would not exceed ~1.2{micro}K.

File Summary:
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  FileName      Lrecl  Records   Explanations
--------------------------------------------------------------------------------
ReadMe             80        .   This file
table1a.dat       111       47   Catalog of 8.44 GHz Radio Sources in
                                 the Linx.2 Field
table1b.dat       111       36   Catalog of 8.44 GHz Radio Sources in
                                 the Cepheus Field
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Byte-by-byte Description of file: table1a.dat table1b.dat
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   Bytes Format  Units   Label    Explanations
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   1-  6  A6     ---      Name     Source name
       7  A1     ---    n_Name     [*] Source with an asterisk is not
                                   in the complete sample
      10  I1     h        RAh      Right ascension (1950)
  12- 13  I2     min      RAm      Right ascension (1950)
  15- 19  F5.2   s        RAs      Right ascension (1950)
  21- 24  F4.2   s      e_RAs      One sigma error on right ascension
  26- 27  I2     deg      DEd      Declination (1950)
  29- 30  I2     arcmin   DEm      Declination (1950)
  32- 35  F4.1   arcsec   DEs      Declination (1950)
  38- 40  F3.1   arcsec e_DEs      One sigma error on declination
  42- 48  F7.1   uJy      S8.44    Integrated sky flux density at 8.44GHz
  49- 55  F7.1   uJy    e_S8.44    One sigma error on integrated sky flux
                                   density
      57  A1     ---    l_SizeM    [<] When '<' the source is an unresolved
                                   source and it's given the 1.5{sigma} upper
                                   limit on the Gaussian major axis
  58- 61  F4.1   arcsec   SizeM    Deconvolved Gaussian source size (FWHM):
                                   major axis
  63- 65  F3.1   arcsec e_SizeM    []? Error on major axis
  67- 70  F4.1   arcsec   Sizem    []? Deconvolved Gaussian source size
                                   (FWHM): minor axis
  72- 74  F3.1   arcsec e_Sizem    []? Error on minor axis
  76- 78  I3     deg      PA       []? Position angle of major axis
  80- 81  I2     deg    e_PA       []? Error on position angle
  83- 86  F4.2   ---      Weight   Source weight in the 8.44 GHz counts
  88- 93  F6.2   uJy      S(p)     Measured peak flux density on the
                                   10arcsec resolution image
  95- 98  F4.2   uJy    e_S(p)     One sigma error on measured peak
                                   flux density
 100-105  F6.2   uJy      S(int)   Resulting integrated flux density
                                   on the 10 arcsec image
 107-111  F5.2   uJy    e_S(int)   One sigma error on resulting integrated
                                   flux density
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Historical Notes:
  * March 1993: Number A075 in H. Andernach's list, transformed 
    from original LaTeX provided by the author
  * Completed at CDS
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(End)                              James Marcout, Simona Mei [CDS]   11-May-1995