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

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Abstract
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 delta z/(1 + z) = 0.26. For sources for which there is prior information that they lie at z > 1, we estimate that the rms of delta z/(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 mu m selected sources, respectively.
Keywords
POPULATION, COLD DUST, UNIVERSE, EVOLUTION, ENERGY, SPIRE, SKY SURVEY, STAR-FORMATION, SUBMILLIMETER GALAXIES, STRONGLY LENSED GALAXIES, submillimetre: galaxies, galaxies: photometry, galaxies: high-redshift

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Citation

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Chicago
Pearson, EA, S Eales, L Dunne, J Gonzalez-Nuevo, S Maddox, JE Aguirre, Maarten Baes, et al. 2013. “H-ATLAS : Estimating Redshifts of Herschel Sources from Sub-mm Fluxes.” Monthly Notices of the Royal Astronomical Society 435 (4): 2753–2763.
APA
Pearson, E., Eales, S., Dunne, L., Gonzalez-Nuevo, J., Maddox, S., Aguirre, J., Baes, M., et al. (2013). H-ATLAS : estimating redshifts of Herschel sources from sub-mm fluxes. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 435(4), 2753–2763.
Vancouver
1.
Pearson E, Eales S, Dunne L, Gonzalez-Nuevo J, Maddox S, Aguirre J, et al. H-ATLAS : estimating redshifts of Herschel sources from sub-mm fluxes. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. 2013;435(4):2753–63.
MLA
Pearson, EA, S Eales, L Dunne, et al. “H-ATLAS : Estimating Redshifts of Herschel Sources from Sub-mm Fluxes.” MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 435.4 (2013): 2753–2763. Print.
@article{4385269,
  abstract     = {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 {\textlangle} z {\textlangle} 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 delta z/(1 + z) = 0.26. For sources for which there is prior information that they lie at z {\textrangle} 1, we estimate that the rms of delta z/(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 mu m selected sources, respectively.},
  author       = {Pearson, EA and Eales, S and Dunne, L and Gonzalez-Nuevo, J and Maddox, S and Aguirre, JE and Baes, Maarten and Baker, AJ and Bourne, N and Bradford, CM and Clark, CJR and Cooray, A and Dariush, A and De Zotti, G and Dye, S and Frayer, D and Gomez, HL and Harris, AI and Hopwood, R and Ibar, E and Ivison, RJ and Jarvis, M and Krips, M and Lapi, A and Lupu, RE and Michalowski, Michal and Rosenman, M and Scott, D and Valiante, E and Valtchanov, I and van der Werf, P and Vieira, JD},
  issn         = {0035-8711},
  journal      = {MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY},
  language     = {eng},
  number       = {4},
  pages        = {2753--2763},
  title        = {H-ATLAS : estimating redshifts of Herschel sources from sub-mm fluxes},
  url          = {http://dx.doi.org/10.1093/mnras/stt1369},
  volume       = {435},
  year         = {2013},
}

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