Journal Article

Extragalactic number counts at 100 μm, free from cosmic variance

B. Sibthorpe, R. J. Ivison, R. J. Massey, I. G. Roseboom, P. P. van der Werf, B. C. Matthews and J. S. Greaves

in Monthly Notices of the Royal Astronomical Society: Letters

Published on behalf of The Royal Astronomical Society

Volume 428, issue 1, pages L6-L10
Published in print January 2013 |
Published online October 2012 | e-ISSN: 1745-3933 | DOI: http://dx.doi.org/10.1093/mnrasl/sls002

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We use data from the Disc Emission via a Bias-free Reconnaissance in the Infrared/Submillimetre (DEBRIS) survey, taken at 100 μm with the Photoconductor Array Camera and Spectrometer instrument on board the Herschel Space Observatory, to make a cosmic variance independent measurement of the extragalactic number counts. These data consist of 323 small-area mapping observations performed uniformly across the sky, and thus represent a sparse sampling of the astronomical sky with an effective coverage of ∼2.5 deg2.

We find our cosmic variance independent analysis to be consistent with previous count measurements made using relatively small area surveys. Furthermore, we find no statistically significant cosmic variance on any scale within the errors of our data. Finally, we interpret these results to estimate the probability of galaxy source confusion in the study of debris discs.

Keywords: cosmology: miscellaneous; large-scale structure of Universe; infrared: galaxies

Journal Article.  3814 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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