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e-MERLIN observations at 5 GHz of the GOODS-N region : pinpointing AGN cores in high-redshift galaxies.

Guidetti, D. and Bondi, M. and Prandoni, I. and Beswick, R.J. and Muxlow, T.W.B. and Wrigley, N. and Smail, I. and McHardy, I. (2013) 'e-MERLIN observations at 5 GHz of the GOODS-N region : pinpointing AGN cores in high-redshift galaxies.', Monthly notices of the Royal Astronomical Society., 432 (4). pp. 2798-2807.

Abstract

We present 5 GHz e-Multi-Element Radio-Linked Interferometer Network (e-MERLIN) observations of the Great Observatories Origins Deep Surveys North (GOODS)-N region at sub-arcsec resolution (0.2–0.5 arcsec). These data form part of the early commissioning observations for the e-MERLIN interferometer and a pilot for the e-MERLIN legacy programme e-MERLIN Galaxy Evolution Survey (eMERGE). A total of 17 sources were detected with S/N > 3. These observations provide unique information on the radio source morphology at sub-arcsec scales. For twelve of these sources, deeper 1.4 GHz MERLIN+Very Large Array observations at the same spatial resolution are available, allowing radio spectral indices to be derived for 10 sources on sub-arcsec angular scales. Via analysis of the spectral indices and radio morphologies, these sources have been identified as active galactic nucleus (AGN) cores in moderate-to-high-redshift (1 < z < 4) galaxies. These results have provided AGN (or AGN-candidate) classification for six previously unclassified sources and confirmed the AGN nature of the rest of the sample. Ultimately, the eMERGE project will image the GOODS-N region at 1.4 and 5 GHz with higher resolution (about 50 mas at 5 GHz) and down to sub-μJy sensitivities. The unique combination of sensitivity and spatial resolution will be exploited to study star formation and AGN activity in distant galaxies.

Item Type:Article
Keywords:Galaxies: active, Galaxies: evolution, Galaxies: starburst, Cosmology: observations, Radio continuum: galaxies.
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Status:Peer-reviewed
Publisher Web site:http://dx.doi.org/10.1093/mnras/stt633
Publisher statement:This article has been accepted for publication in Monthly notices of the Royal Astronomical Society © 2013 The Authors Published by Oxford University Press on behalf of Royal Astronomical Society. All rights reserved.
Record Created:19 Jun 2014 10:05
Last Modified:20 Jun 2014 11:11

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