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For refcode 1990ApJ...363...11W:
Retrieve 58 NED objects in this reference.
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Copyright by American Astronomical Society. Reproduced by permission
1990ApJ...363...11W COUNTS OF SERENDIPITOUS 6 CENTIMETER SOURCES IN E/S0 GALAXY FIELDS J. M. WROBEL, AND S. W. KRAUSE Received 1990 February 20; accepted 1990 May 1 ABSTRACT One hundred and sixty-eight VLA images from a 6 cm survey of E/S0 galaxies were searched for serendipitous sources at millijansky (mJy) levels. Fifty-eight sources with integrated flux densities between 1.5 and 15 mJy were found within a total solid angle of 2.27 deg^2^. The sources show no radial clustering relative to the galaxy centers and so are not, statistically, associated with the galaxies. We assume the 58 are background sources suitable for cosmological studies and use them to determine new differential source counts. These new counts are consistent with previous, but much less accurate, counts at mJy levels, meaning that the background source population is not measurably altered by the presence of the foreground E/S0 galaxies. The slope of the new counts in the 1.5-15 mJy range is significantly steeper than the slope at sub-mJy levels reported by Fomalont et al., supporting the emergence of a new 6 cm population at those lower levels and resembling the situation at 20 cm. Thus interesting structure exists in the differential source counts at the same flux density levels at both 20 and 6 cm. Such structure must be explained by models for cosmological evolution of radio source populations. Subject headings: cosmology - radio sources: general
Retrieve 58 NED objects in this reference.
Please click here for ADS abstract

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