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An ALMA survey of submillimetre galaxies in the Extended Chandra Deep Field South: radio properties and the far-infrared/radio correlation

Thomson, A. P. and Ivison, R. J. and Simpson, J. M. and Swinbank, A. M. and Smail, Ian and Arumugam, V. and Alexander, D. M. and Beelen, A. and Brandt, W. N. and Chandra, I. and Dannerbauer, H. and Greve, T. R. and Hodge, J. A. and Ibar, E. and Karim, A. and Murphy, E. J. and Schinnerer, E. and Sirothia, S. and Walter, F. and Wardlow, J. L. and van der Werf, P. P. (2014) An ALMA survey of submillimetre galaxies in the Extended Chandra Deep Field South: radio properties and the far-infrared/radio correlation. Monthly Notices of the Royal Astronomical Society, 442 (1). pp. 577-588. ISSN 0035-8711.

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We present a study of the radio properties of 870 μm-selected submillimetre galaxies (SMGs), observed at high resolution with Atacama Large Millimeter Array (ALMA) in the Extended Chandra Deep Field South. From our initial sample of 76 ALMA SMGs, we detect 52 SMGs at >3σ significance in Karl G. Jansky Very Large Array 1400 MHz imaging, of which 35 are also detected at >3σ in new 610 MHz Giant Metre-Wave Radio Telescope imaging. Within this sample of radio-detected SMGs, we measure a median radio spectral index α^(1400)_(610)=−0.79±0.06, (with inter-quartile range α = [−1.16, −0.56]) and investigate the far-infrared/radio correlation via the parameter qIR, the logarithmic ratio of the rest-frame 8–1000 μm flux and monochromatic radio flux. Our median qIR = 2.56 ± 0.05 (inter-quartile range qIR = [2.42, 2.78]) is higher than that typically seen in single-dish 870 μm-selected sources (qIR ∼ 2.4), which may reflect the fact that our ALMA-based study is not biased to radio-bright counterparts, as previous samples were. Finally, we search for evidence that qIR and α evolve with age in a codependent manner, as predicted by starburst models: the data populate the predicted region of parameter space, with the stellar mass tending to increase along tracks of qIR versus α in the direction expected, providing the first observational evidence in support of these models.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Smail, Ian0000-0003-3037-257X
Alexander, D. M.0000-0002-5896-6313
Brandt, W. N.0000-0002-0167-2453
Karim, A.0000-0002-8414-9579
Murphy, E. J.0000-0001-7089-7325
Schinnerer, E.0000-0002-3933-7677
Walter, F.0000-0003-4793-7880
Wardlow, J. L.0000-0003-2376-8971
van der Werf, P. P.0000-0001-5434-5942
Additional Information:© 2014 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2014 April 23. Received 2014 April 21; in original form 2014 January 19. We thank the editor and anonymous referee for their constructive comments which have led to the improvement of this paper. This paper makes use of the following ALMA data: ADS/JAO.ALMA#2011.0.00294.S. ALMA is a partnership of ESO (representing its member states), NSF (USA) and NINS (Japan), together with NRC (Canada) and NSC and ASIAA (Taiwan), in cooperation with the Republic of Chile. The Joint ALMA Observatory is operated by ESO, AUI/NRAO and NAOJ. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. We also thank the staff of the GMRT who made these observations possible. GMRT is run by the National Centre for Radio Astrophysics of the Tata Institute of Fundamental Research. This research also made use of data taken as part of the HerMES Key Programme from the SPIRE instrument team, ESAC scientists and a mission scientist. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA. All of the ALMA, Herschel, VLA and Spitzer data employed in this analysis are available through the ESO, Herschel, VLA and Spitzer archives. APT and IRS acknowledge support from STFC (ST/I001573/1). AMS gratefully acknowledges an STFC Advanced Fellowship through grant number ST/H005234/1. IRS also acknowledges a Leverhulme Fellowship, the ERC Advanced Investigator Programme DUSTYGAL (#321334) and a Royal Society/Wolfson merit award. RJI acknowledges support from the ERC in the form of Advanced Grant COSMICISM. JMS and ALRD acknowledge the support of STFC studentships (ST/J501013/1 and ST/F007299/1, respectively). EI acknowledges funding from CONICYT/FONDECYT postdoctoral project N◦:3130504. The Dark Cosmology Centre is funded by The Danish National Research Foundation.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Science and Technology Facilities Council (STFC)ST/H005234/1
Leverhulme TrustUNSPECIFIED
European Research Council (ERC)321334
European Research Council (ERC)COSMICISM
Science and Technology Facilities Council (STFC)ST/J501013/1
Fondo Nacional de Desarrollo Científico y Tecnológico (FONDECYT)3130504
Danish National Research FoundationUNSPECIFIED
Subject Keywords:galaxies: evolution; galaxies: high-redshift; galaxies: starburst
Record Number:CaltechAUTHORS:20140808-093023997
Persistent URL:
Official Citation:Thomson, A. P., Ivison, R. J., Simpson, J. M., Swinbank, A. M., Smail, I., Arumugam, V., . . . van der Werf, P. (2014). An ALMA survey of submillimetre galaxies in the Extended Chandra Deep Field South: radio properties and the far-infrared/radio correlation. Monthly Notices of the Royal Astronomical Society, 442(1), 577-588. doi: 10.1093/mnras/stu839
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:48227
Deposited By: Jason Perez
Deposited On:08 Aug 2014 21:46
Last Modified:01 Dec 2017 20:06

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