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Herschel-ATLAS: Extragalactic number counts from 250 to 500 microns

Clements, D. L., Rigby, E., Maddox, Steve ORCID:, Dunne, Loretta ORCID:, Mortier, A., Pearson, C., Amblard, A., Auld, R., Baes, M., Bonfield, D., Burgarella, D., Buttiglione, S., Cava, A., Cooray, A., Dariush, A., de Zotti, G., Dye, S., Eales, Stephen ORCID:, Frayer, D., Fritz, J., Gardner, J., Gonzalez-Nuevo, J., Herranz, D., Ibar, E., Ivison, R., Jarvis, M. J., Lagache, G., Leeuw, L., Lopez-Caniego, M., Negrello, Mattia ORCID:, Pascale, Enzo ORCID:, Pohlen, M., Rodighiero, G., Samui, S., Serjeant, S., Sibthorpe, B., Scott, D., Smith, D. J. B., Temi, P., Thompson, M., Valtchanov, I., van der Werf, P. and Verma, A. 2010. Herschel-ATLAS: Extragalactic number counts from 250 to 500 microns. Astronomy and Astrophysics 518 , L8. 10.1051/0004-6361/201014581

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Aims. The Herschel-ATLAS survey (H-ATLAS) will be the largest area survey to be undertaken by the Herschel Space Observatory. It will cover 550 sq. deg. of extragalactic sky at wavelengths of 100, 160, 250, 350 and 500 μm when completed, reaching flux limits (5σ) from 32 to 145 mJy. We here present galaxy number counts obtained for SPIRE observations of the first ~14 sq. deg. observed at 250, 350 and 500 μm. Methods. Number counts are a fundamental tool in constraining models of galaxy evolution. We use source catalogs extracted from the H-ATLAS maps as the basis for such an analysis. Correction factors for completeness and flux boosting are derived by applying our extraction method to model catalogs and then applied to the raw observational counts. Results. We find a steep rise in the number counts at flux levels of 100–200 mJy in all three SPIRE bands, consistent with results from BLAST. The counts are compared to a range of galaxy evolution models. None of the current models is an ideal fit to the data but all ascribe the steep rise to a population of luminous, rapidly evolving dusty galaxies at moderate to high redshift.

Item Type: Article
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QC Physics
Uncontrolled Keywords: galaxies: evolution; galaxies: statistics; infrared: galaxies; submillimeter: galaxies
Publisher: EDP Sciences
ISSN: 00046361
Date of Acceptance: 12 May 2010
Last Modified: 31 Oct 2022 10:11

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