Extragalactic number counts at 100 μm, free from cosmic variance

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

doi:10.1093/mnrasl/sls002

Extragalactic number counts at 100 μm, free from cosmic variance

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

Authors

B. Sibthorpe

R.J. Ivison

Professor Richard Massey r.j.massey@durham.ac.uk
Professor

I.G. Roseboom

P.P. van der Werf

B.C. Matthews

J.S. Greaves

Abstract

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.

Citation

Sibthorpe, B., Ivison, R., Massey, R., Roseboom, I., van der Werf, P., Matthews, B., & Greaves, J. (2013). Extragalactic number counts at 100 μm, free from cosmic variance. Monthly Notices of the Royal Astronomical Society: Letters, 428(1), L6-L10. https://doi.org/10.1093/mnrasl/sls002

Journal Article Type	Article
Publication Date	Jan 1, 2013
Deposit Date	Mar 21, 2013
Publicly Available Date	Jun 27, 2014
Journal	Monthly Notices of the Royal Astronomical Society: Letters
Electronic ISSN	1745-3933
Publisher	Oxford University Press
Peer Reviewed	Peer Reviewed
Volume	428
Issue	1
Pages	L6-L10
DOI	https://doi.org/10.1093/mnrasl/sls002
Keywords	Cosmology: miscellaneous, Large-scale structure of Universe, Infrared: galaxies.

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This article has been accepted for publication in Monthly notices of the Royal Astronomical Society : letters © 2013 The Authors Published by Oxford University Press on behalf of Royal Astronomical Society. All rights reserved.