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H-ATLAS: estimating redshifts of Herschel sources from sub-mm fluxes

Pearson, E. A. and Vieira, J. D. (2013) H-ATLAS: estimating redshifts of Herschel sources from sub-mm fluxes. Monthly Notices of the Royal Astronomical Society, 435 (4). pp. 2753-2763. ISSN 0035-8711.

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Upon its completion, the Herschel Astrophysics Terahertz Large Area Survey (H-ATLAS) will be the largest sub-millimetre survey to date, detecting close to half-a-million sources. It will only be possible to measure spectroscopic redshifts for a small fraction of these sources. However, if the rest-frame spectral energy distribution (SED) of a typical H-ATLAS source is known, this SED and the observed Herschel fluxes can be used to estimate the redshifts of the H-ATLAS sources without spectroscopic redshifts. In this paper, we use a sub-set of 40 H-ATLAS sources with previously measured redshifts in the range 0.5 < z < 4.2 to derive a suitable average template for high-redshift H-ATLAS sources. We find that a template with two dust components (T_c = 23.9 K, T_h = 46.9 K and ratio of mass of cold dust to mass of warm dust of 30.1) provides a good fit to the rest-frame fluxes of the sources in our calibration sample. We use a jackknife technique to estimate the accuracy of the redshifts estimated with this template, finding a root mean square of Δz/(1 + z) = 0.26. For sources for which there is prior information that they lie at z > 1, we estimate that the rms of Δz/(1 + z) = 0.12. We have used this template to estimate the redshift distribution for the sources detected in the H-ATLAS equatorial fields, finding a bimodal distribution with a mean redshift of 1.2, 1.9 and 2.5 for 250, 350 and 500 μm selected sources, respectively.

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Additional Information:© 2013 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2013 July 19. Received 2013 July 18; in original form 2013 February 28. First published online: September 21, 2013. The Herschel-ATLAS is a project with Herschel, which is an ESA space observatory with science instruments provided by European led Principal Investigator consortia and with important participation from NASA. The H-ATLAS website is GAMA is a joint European-Australasian project based around a spectroscopic campaign using the Anglo-Australian Telescope. The GAMA input catalogue is based on data taken from the SDSS and the UKIRT Infrared Deep Sky Survey. Complementary imaging of the GAMA regions is being obtained by a number of independent survey programmes including GALEX MIS, VST KIDS, VISTA VIKING, WISE, Herschel-ATLAS, GMRT and ASKAP providing UV to radio coverage. GAMA is funded by the STFC (UK), the ARC (Australia), the AAO and the participating institutions. The GAMA website is SPIRE has been developed by a consortium of institutes led by Cardiff University (UK) and including Univ. Lethbridge (Canada); NAOC (China); CEA, LAM (France); IFSI, Univ. Padua (Italy); IAC (Spain); Stockholm Observatory (Sweden); Imperial College London, RAL, UCL-MSSL, UKATC, Univ. Sussex (UK); and Caltech, JPL, NHSC, Univ. Colorado (USA). This development has been supported by national funding agencies: CSA (Canada); NAOC (China); CEA, CNES, CNRS (France); ASI (Italy); MCINN (Spain); SNSB (Sweden); STFC (UK) and NASA (USA). KSS is supported by the National Radio Astronomy Observatory, which is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. JGN acknowledges financial support from Spanish CSIC for a JAE-DOC fellowship and partial financial support from the Spanish Ministerio de Ciencia e Innovacion project AYA2010-21766-C03-01.
Funding AgencyGrant Number
National Radio Astronomy ObservatoryUNSPECIFIED
Spanish Ministerio de Ciencia e InnovaciónAYA2010-21766-C03-01
Subject Keywords:galaxies: high-redshift, galaxies: photometry, submillimetre: galaxies.
Issue or Number:4
Record Number:CaltechAUTHORS:20131209-150132122
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Official Citation: E. A. Pearson, S. Eales, L. Dunne, J. Gonzalez-Nuevo, S. Maddox, J. E. Aguirre, M. Baes, A. J. Baker, N. Bourne, C. M. Bradford, C. J. R. Clark, A. Cooray, A. Dariush, G. De Zotti, S. Dye, D. Frayer, H. L. Gomez, A. I. Harris, R. Hopwood, E. Ibar, R. J. Ivison, M. Jarvis, M. Krips, A. Lapi, R. E. Lupu, M. J. Michałowski, M. Rosenman, D. Scott, E. Valiante, I. Valtchanov, P. van der Werf, and J. D. Vieira H-ATLAS: estimating redshifts of Herschel sources from sub-mm fluxes MNRAS (November 11, 2013) Vol. 435 2753-2763 first published online September 21, 2013 doi:10.1093/mnras/stt1369
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:42911
Deposited By: Ruth Sustaita
Deposited On:10 Dec 2013 16:01
Last Modified:03 Oct 2019 06:03

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