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

Pearson, Elizabeth, Eales, Stephen Anthony, Dunne, Loretta, Gonzalez-Nuevo, J., Maddox, Steve, Aguirre, J. E., Baes, M., Baker, A. J., Bourne, N., Bradford, C. M., Clark, Christopher Jonathan Redfern, Cooray, A., Dariush, A., Zotti, G. D., Dye, S., Frayer, D., Gomez, Haley Louise, Harris, A. I., Hopwood, R., Ibar, E., Ivison, R. J., Jarvis, M., Krips, M., Lapi, A., Lupu, R. E., Michalowski, M. J., Rosenman, M., Scott, D., Valiante, Elisabetta, Valtchanov, I., Werf, P. v. d. 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. 10.1093/mnras/stt1369

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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 (Tc = 23.9 K, Th = 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.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Uncontrolled Keywords: galaxies: high-redshift; galaxies: photometry; submillimetre: galaxies
Publisher: Oxford University Press
ISSN: 0035-8711
Last Modified: 14 May 2019 20:04

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