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10C continued: A deeper radio survey at 15.7 GHz

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Authors
Whittam, I.
Riley, J.
Green, D.
Davies, M.
Franzen, Thomas
Rumsey, C.
Schammel, M.
Waldram, E.
Date
2016
Type
Journal Article

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Whittam, I. and Riley, J. and Green, D. and Davies, M. and Franzen, T. and Rumsey, C. and Schammel, M. et al. 2016. 10C continued: A deeper radio survey at 15.7 GHz. Monthly Notices of the Royal Astronomical Society. 457 (2): pp. 1496-1506.
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Monthly Notices of the Royal Astronomical Society
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Curtin Institute of Radio Astronomy (Physics)
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This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

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Abstract

We present deep 15.7 GHz observations made with the Arcminute Microkelvin Imager Large Array in two fields previously observed as part of the Tenth Cambridge (10C) survey. These observations allow the source counts to be calculated down to 0.1 mJy, a factor of 5 deeper than achieved by the 10C survey. The new source counts are consistent with the extrapolated fit to the 10C source count, and display no evidence for either steepening or flattening of the counts. There is thus no evidence for the emergence of a significant new population of sources (e.g. star forming) at 15.7 GHz flux densities above 0.1 mJy, the flux density level at which we expect star-forming galaxies to begin to contribute. Comparisons with the de Zotti et al. model and the SKADS Simulated Sky show that they both underestimate the observed number of sources by a factor of 2 at this flux density level. We suggest that this is due to the flat-spectrum cores of radio galaxies contributing more significantly to the counts than predicted by the models. © 2016 The Authors.