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(Sub)millimetre interferometric imaging of a sample of COSMOS/AzTEC submillimetre galaxies. I. Multiwavelength identifications and redshift distribution

Miettinen, O. and Smolčić, V. and Novak, M. and Aravena, M. and Karim, A. and Masters, D. and Riechers, D. A. and Bussmann, R. S. and McCracken, H. J. and Ilbert, O. and Bertoldi, F. and Capak, P. and Feruglio, C. and Halliday, C. and Kartaltepe, J. S. and Navarrete, F. and Salvato, M. and Sanders, D. and Schinnerer, E. and Sheth, K. (2015) (Sub)millimetre interferometric imaging of a sample of COSMOS/AzTEC submillimetre galaxies. I. Multiwavelength identifications and redshift distribution. Astronomy and Astrophysics, 577 . Art. No. A29. ISSN 0004-6361.

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We used the Plateau de Bure Interferometer (PdBI) to map a sample of 15 submillimetre galaxies (SMGs) in the COSMOS field at the wavelength of 1.3 mm. The target SMGs were originally discovered in the James Clerk Maxwell Telescope (JCMT)/AzTEC 1.1 mm continuum survey at S/N_(1.1 mm) = 4−4.5. This paper presents, for the first time, interferometric millimetre-wavelength observations of these sources. The angular resolution of our observations, ~1."8, allowed us to accurately determine the positions of the target SMGs. Using a detection threshold of S/N_(1.3 mm)> 4.5 regardless of multiwavelength counterpart association, and 4 <S/N_(1.3 mm) ≤ 4.5 if a multiwavelength counterpart within 1."5 is also present, the total number of detections in our survey is 22. The most significant PdBI detection of S/N_(1.3 mm) = 10.3 is towards AzTEC19. Three of our detected SMGs (AzTEC21, 27, and 28; which corresponds to 20%) are marginally resolved at our angular resolution, and these sources are found to have elongated or clumpy morphologies and/or multiple components. Using optical to near-infrared photometric redshifts, available spectroscopic redshifts, and redshifts estimated from the radio-to-submm spectral index we infer a median redshift of z = 3.20 ± 0.25 for our sample. To study the overall multiplicity and redshift distribution of flux-limited samples of SMGs we combined these sources with the 15 brightest JCMT/AzTEC SMGs detected at 1.1 mm, AzTEC1−15, and studied previously. This constitutes a complete, flux- and S/N-limited 1.1-mm selected sample. We find that the median redshift for the 15 brightest JCMT/AzTEC SMGs (z = 3.05 ± 0.44) is consistent with that for AzTEC16−30. This conforms to recent observational findings that SMGs do not exhibit any significant trend between the redshift and (sub)mm flux density. For the combined AzTEC1−30 sample we derive a median redshift of z = 3.17 ± 0.27, consistent with previous results based on mm-selected samples. We further infer that within the combined AzTEC1−30 sample ~25 ± 9% of sources separate into multiple components.

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McCracken, H. J.0000-0002-9489-7765
Schinnerer, E.0000-0002-3933-7677
Additional Information:© 2015 ESO. Received 19 September 2014. Accepted 13 February 2015. Published online: 27 April 2015. We thank the referee for providing helpful and constructive comments. We would also like to thank C. M. Casey and S. Toft for their comments and suggestions. This research was funded by the European Union’s Seventh Framework programme under grant agreement 337595 (ERC Starting Grant, “CoS-Mass”). AK acknowledges support by the Collaborative Research Council 956, sub-project A1, funded by the Deutsche Forschungsgemeinschaft (DFG). We would like to thank the IRAM staff for carrying out the PdBI observations presented in this paper. This work is partly based on data products from observations made with ESO Telescopes at the La Silla Paranal Observatory under ESO programme ID 179.A-2005 and on data products produced by TERAPIX and the Cambridge Astronomy Survey Unit on behalf of the UltraVISTA consortium. This research has made use of NASA’s Astrophysics Data System, and the NASA/IPAC Infrared Science Archive, which is operated by the JPL, California Institute of Technology, under contract with the NASA. This study also made use of APLpy, an open-source plotting package for Python hosted at, and TOPCAT, an interactive graphical tool for analysis and manipulation of tabular data available at (Taylor (2005)). We greatfully acknowledge the contributions of the entire COSMOS collaboration consisting of more than 100 scientists. More information on the COSMOS survey is available at
Group:COSMOS, Infrared Processing and Analysis Center (IPAC), SPLASH
Funding AgencyGrant Number
European Research Council (ERC)337595
Deutsche Forschungsgemeinschaft (DFG)UNSPECIFIED
Subject Keywords:galaxies: evolution, galaxies: formation, galaxies: starburst, galaxies: star formation, submillimeter: galaxies
Record Number:CaltechAUTHORS:20150605-105722803
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Official Citation:O. Miettinen, V. Smolčić, M. Novak, M. Aravena, A. Karim, D. Masters, D. A. Riechers, R. S. Bussmann, H. J. McCracken, O. Ilbert, F. Bertoldi, P. Capak, C. Feruglio, C. Halliday, J. S. Kartaltepe, F. Navarrete, M. Salvato, D. Sanders, E. Schinnerer and K. Sheth A&A 577 A29 (2015) DOI:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:58041
Deposited By: Ruth Sustaita
Deposited On:05 Jun 2015 18:32
Last Modified:29 Jun 2017 20:02

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