A deep Giant Metre-wave Radio Telescope 610-MHz survey of the 1H XMM-Newton/Chandra survey field

Details A deep Giant Metre-wave Radio Telescope 610-MHz survey of the 1H XMM-Newton/Chandra survey field A deep Giant Metre-wave Radio Telescope 610-MHz survey of the 1H XMM-Newton/Chandra survey field

Jul 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007mnras.378..995m&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 378, Issue 3, pp. 995-1006.

Astronomy and Astrophysics

Astronomy

11

Surveys, Galaxies: Active, Galaxies: Starburst, Radio Continuum: Galaxies

Scientific paper

We present the results of a deep 610-MHz survey of the 1H XMM-Newton/Chandra survey area with the Giant Metre-wave Radio Telescope. The resulting maps have a resolution of ~7 arcsec and an rms noise limit of 60 μJy. To a 5σ detection limit of 300 μJy, we detect 223 sources within a survey area of 64 arcmin in diameter. We compute the 610-MHz source counts and compare them to those measured at other radio wavelengths. The well-known flattening of the Euclidean-normalized 1.4-GHz source counts below ~2 mJy, usually explained by a population of starburst galaxies undergoing luminosity evolution, is seen at 610 MHz. The 610-MHz source counts can be modelled by the same populations that explain the 1.4-GHz source counts, assuming a spectral index of -0.7 for the starburst galaxies and the steep spectrum active galactic nucleus (AGN) population. We find a similar dependence of luminosity evolution on redshift for the starburst galaxies at 610 MHz as is found at 1.4 GHz (i.e. `Q' = 2.45+0.3-0.4).

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