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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 709733.0, MPI für Astronomie / Publikationen_mpia
An ALMA survey of submillimetre galaxies in the Extended Chandra Deep Field South: radio properties and the far-infrared/radio correlation
Authors:Thomson, A. P.; Ivison, R. J.; Simpson, J. M.; Swinbank, A. M.; Smail, I.; Arumugam, V.; Alexander, D. M.; Beelen, A.; Brandt, W. N.; Chandra, I.; Dannerbauer, H.; Greve, T. R.; Hodge, J. A.; Ibar, E.; Karim, A.; Murphy, E. J.; Schinnerer, E.; Sirothia, S.; Walter, F.; Wardlow, J. L.; van der Werf, P.
Date of Publication (YYYY-MM-DD):2014
Title of Journal:Monthly Notices of the Royal Astronomical Society
Issue / Number:1
Start Page:577
End Page:588
Audience:Not Specified
Abstract / Description:We present a study of the radio properties of 870 mum-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 >3sigma significance in Karl G. Jansky Very Large Array 1400 MHz imaging, of which 35 are also detected at >3sigma in new 610 MHz Giant Metre-Wave Radio Telescope imaging. Within this sample of radio-detected SMGs, we measure a median radio spectral index alpha _{610}^{1400} = -0.79 ± 0.06, (with inter-quartile range alpha = [-1.16, -0.56]) and investigate the far-infrared/radio correlation via the parameter qIR, the logarithmic ratio of the rest-frame 8-1000 mum 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 mum-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 alpha 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 alpha in the direction expected, providing the first observational evidence in support of these models.
Free Keywords:galaxies: evolution; galaxies: high-redshift; galaxies: starburst
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0035-8711 %R 10.1093/mnras/stu839
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