Skip to main content

Research Repository

Advanced Search

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.

Extragalactic number counts at 100 μm, free from cosmic variance Thumbnail


B. Sibthorpe

R.J. Ivison

I.G. Roseboom

P.P. van der Werf

B.C. Matthews

J.S. Greaves


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.


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.

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
Keywords Cosmology: miscellaneous, Large-scale structure of Universe, Infrared: galaxies.


Published Journal Article (380 Kb)

Copyright Statement
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.

You might also like

Downloadable Citations