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A deep Giant Metre-wave Radio Telescope 610-MHz survey of the 1^HXMM–Newton/Chandra survey field

Moss, D. and Seymour, N. and McHardy, I. M. and Dwelly, T. and Page, M. J. and Loaring, N. S. (2007) A deep Giant Metre-wave Radio Telescope 610-MHz survey of the 1^HXMM–Newton/Chandra survey field. Monthly Notices of the Royal Astronomical Society, 378 (3). pp. 995-1006. ISSN 0035-8711.

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We present the results of a deep 610-MHz survey of the 1^HXMM–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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Additional Information:© 2007 The Authors. Journal compilation © 2007 RAS. Accepted 2007 April 5. Received 2007 March 30; in original form 2006 September 8. DM acknowledges the support of a PPARC studentship, and IMMcH and TD acknowledge the support under PPARC grant PP/D001013/1. We thank the staff of the GMRT for their very helpful support that made these observations possible. GMRT is run by the National Centre for Radio Astrophysics of the Tata Institute of Fundamental Research. DM and NSL would like to thank Niruj Mohan for indispensable advice and assistance. The DSSs were produced at the Space Telescope Science Institute under US government grant NAG W-2166. We also thank Dave Green for the customized AIPS task UVFLP, and the referee, whose comments greatly improved this manuscript.
Funding AgencyGrant Number
Particle Physics and Astronomy Research Council (PPARC) studentshipUNSPECIFIED
Particle Physics and Astronomy Research Council (PPARC) PP/D001013/1
Subject Keywords:surveys; galaxies : active; galaxies : starburst; radio continuum : galaxies
Record Number:CaltechAUTHORS:20100222-150055829
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:17557
Deposited By: Tony Diaz
Deposited On:02 Mar 2010 17:58
Last Modified:26 Dec 2012 11:47

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