A Caltech Library Service

Probing the submillimetre number counts at f(850 mu m) < 2mJy

Knudsen, K. K. and van der Werf, P. P. and Kneib, J.-P. (2008) Probing the submillimetre number counts at f(850 mu m) < 2mJy. Monthly Notices of the Royal Astronomical Society, 384 (4). pp. 1611-1626. ISSN 0035-8711. doi:10.1111/j.1365-2966.2007.12820.x.

PDF - Published Version
See Usage Policy.


Use this Persistent URL to link to this item:


We have conducted a submillimetre mapping survey of faint, gravitationally lensed sources, where we have targeted 12 galaxy clusters and additionally the New Technology Telescope (NTT) Deep Field. The total area surveyed is 71.5 arcmin^(2) in the image plane; correcting for gravitational lensing, the total area surveyed is 40 arcmin^(2) in the source plane for a typical source redshift z approximate to 2.5. In the deepest maps, an image plane depth of 1sigma rms similar to 0.8 mJy is reached. This survey is the largest survey to date to reach such depths. In total 59 sources were detected, including three multiply imaged sources. The gravitational lensing makes it possible to detect sources with flux density below the blank field confusion limit. The lensing-corrected fluxes range from 0.11 to 19 mJy. After correcting for multiplicity, there are 10 sources with fluxes < 2 mJy of which seven have submJy fluxes, doubling the number of such sources known. Number counts are determined below the confusion limit. At 1 mJy, the integrated number count is similar to 10^(4) deg^(-2), and at 0.5 mJy it is similar to 2 x 10^(4) deg^(-2). Based on the number counts, at a source plan flux limit of 0.1 mJy, essentially all of the 850-mu m background emission has been resolved. The dominant contribution (> 50 per cent) to the integrated background arises from sources with fluxes S-850 between 0.4 and 2.5 mJy, while the bright sources S-850 > 6 mJy contribute only 10 per cent.

Item Type:Article
Related URLs:
URLURL TypeDescription
Knudsen, K. K.0000-0002-7821-8873
van der Werf, P. P.0000-0001-5434-5942
Kneib, J.-P.0000-0002-4616-4989
Additional Information:© 2008 The Authors. Journal compilation © 2008 RAS. Accepted 2007 December 5. Received 2007 October 24; in original form 2007 January 14. Published Online: 7 February 2008. We thank Vicki Barnard, Tracy Webb, Marijn Franx and Graham Smith for fruitful discussions. We are grateful to Patricio Vielva and his colleagues for useful discussions regarding wavelets and letting us use their software. We thank an anonymous referee for constructive comments, which helped improve the manuscript. The JCMT is operated by the Joint Astronomy Centre on behalf of the Science and Technology Facilities Council of the United Kingdom, the Netherlands Organization for Scientific Research and the National Research Council of Canada. KKK acknowledges support by the Netherlands Organization for Scientific Research (NWO) and the Leids Kerkhoven-Bosscha Fonds for travel support. JPK acknowledges support from Caltech and CNRS.
Funding AgencyGrant Number
Science and Technology Facilities Council (STFC)UNSPECIFIED
Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO)UNSPECIFIED
National Research Council of CanadaUNSPECIFIED
Leids Kerkhoven-Bosscha FondsUNSPECIFIED
Centre National de la Recherche Scientifique (CNRS)UNSPECIFIED
Subject Keywords:surveys; galaxies: evolution; galaxies: high-redshift; galaxies: starburst; submillimetre
Issue or Number:4
Record Number:CaltechAUTHORS:KNUmnras08
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:13233
Deposited By: Tony Diaz
Deposited On:11 Feb 2009 04:58
Last Modified:08 Nov 2021 22:36

Repository Staff Only: item control page