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

Pearson, Elizabeth, Eales, Stephen Anthony ORCID:, Dunne, Loretta ORCID:, Gonzalez-Nuevo, J., Maddox, Steve ORCID:, 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 ORCID:, 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: 25 Oct 2022 08:23

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