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The Herschel-ATLAS: Extragalatic Number Counts from 250 to 500 MicronsAims.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 microns when completed, reaching flux limits (50-) from 32 to 145mJy. We here present galaxy number counts obtained for SPIRE observations of the first -14 sq. deg. observed at 250, 350 and 500 m. 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 100-200mJy 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.
Document ID
20100020932
Acquisition Source
Goddard Space Flight Center
Document Type
Preprint (Draft being sent to journal)
Authors
Clements, D. L.
(Imperial Coll. of London London, United Kingdom)
Rigby, E.
(Nottingham Univ. United Kingdom)
Maddox, S.
(Nottingham Univ. United Kingdom)
Dunne, L.
(Nottingham Univ. United Kingdom)
Mortier, A.
(Imperial Coll. of London London, United Kingdom)
Amblard, A.
(California Univ. Irvine, CA, United States)
Auld, R.
(Cardiff Univ. United Kingdom)
Bonfield, D.
(California Univ. Irvine, CA, United States)
Cooray, A.
(California Univ. Irvine, CA, United States)
Dariush, A.
(Cardiff Univ. United Kingdom)
Dye, S.
(Cardiff Univ. United Kingdom)
Eales, S.
(Cardiff Univ. United Kingdom)
Gardner, Jonathan P.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Ibar, E.
(Royal Observatory Edinburgh, United Kingdom)
Ivison, R.
(Royal Observatory Edinburgh, United Kingdom)
Leeuw, L.
(NASA Ames Research Center Moffett Field, CA, United States)
Sibthorpe, B.
(Royal Observatory Edinburgh, United Kingdom)
Smith, D. J. B.
(Cardiff Univ. United Kingdom)
Temi, P.
(NASA Ames Research Center Moffett Field, CA, United States)
Pascale, E.
(Cardiff Univ. United Kingdom)
Pohlen, M.
(Cardiff Univ. United Kingdom)
Date Acquired
August 25, 2013
Publication Date
March 30, 2010
Subject Category
Astrophysics
Distribution Limits
Public
Copyright
Other

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