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29 March 2024
 
  » arxiv » 1202.0134

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High resolution imaging of the ATLBS regions: the radio source counts
K. Thorat ; R. Subrahmanyan ; L. Saripalli ; R. D. Ekers ;
Date 1 Feb 2012
AbstractThe Australia Telescope Low-brightness survey (ATLBS; cite{SESS10}) regions have been mosaic imaged at a radio frequency of 1.4 GHz with $6arcsec$ angular resolution and 72 $mu$Jy beam$^{-1}$ rms noise. The images cover 8.42 square degrees sky area and have no artifacts or imaging errors above the image thermal noise and, therefore, form a resource for attempting automated source identification and classification algorithms. Multi-resolution radio and optical r-band images were used to recognize multi-component sources and prepare a source list. Radio source counts in the flux density range 0.4-8.7 mJy are estimated, with corrections applied for noise bias, effective area correction and resolution bias. The resolution bias is mitigated to a great extent by using low resolution (beam FWHM $= 50arcsec $) radio images, while effects of source confusion are removed by using high resolution images for identifying blended sources. The ATLBS counts are systematically lower than previous estimates. The work underscores the importance of using source lists---as opposed to component lists---and correcting for the noise bias in order to precisely estimate counts close to the image noise and determine the upturn at sub-mJy flux density.
Source arXiv, 1202.0134
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