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HerMES: deep galaxy number counts from a P(D) fluctuation analysis of SPIRE science demonstration phase observations

Glenn, J., Conley, A., Béthermin, M., Altieri, B., Amblard, A., Arumugam, V., Aussel, H., Babbedge, T., Blain, A., Bock, J., Boselli, A., Buat, V., Castro-Rodríguez, N., Cava, A., Chanial, P., Clements, D. L., Conversi, L., Cooray, A., Dowell, C. D., Dwek, E., Eales, Stephen Anthony, Elbaz, D., Ellsworth-Bowers, T. P., Fox, M., Franceschini, A., Gear, Walter Kieran, Griffin, Matthew Joseph, Halpern, M., Hatziminaoglou, E., Ibar, E., Isaak, Kate Gudrun, Ivison, R. J., Lagache, G., Laurent, G., Levenson, L., Lu, N., Madden, S., Maffei, B., Mainetti, G., Marchetti, L., Marsden, G., Nguyen, H. T., O'Halloran, B., Oliver, S. J., Omont, A., Page, M. J., Panuzzo, P., Papageorgiou, Andreas, Pearson, C. P., Pérez-Fournon, I., Pohlen, Michael, Rigopoulou, D., Rizzo, D., Roseboom, I. G., Rowan-Robinson, M., Sánchez Portal, M., Schulz, B., Scott, D., Seymour, N., Shupe, D. L., Smith, A. J., Stevens, J. A., Symeonidis, M., Trichas, M., Tugwell, K. E., Vaccari, M., Valtchanov, I., Vieira, J. D., Vigroux, L., Wang, L., Ward, R., Wright, G., Xu, C. K. and Zemcov, M. 2010. HerMES: deep galaxy number counts from a P(D) fluctuation analysis of SPIRE science demonstration phase observations. Monthly Notices of the Royal Astronomical Society 409 (1) , pp. 109-121. 10.1111/j.1365-2966.2010.17781.x

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Abstract

Dusty, star-forming galaxies contribute to a bright, currently unresolved cosmic far-infrared background. Deep Herschel-Spectral and Photometric Imaging Receiver (SPIRE) images designed to detect and characterize the galaxies that comprise this background are highly confused, such that the bulk lies below the classical confusion limit. We analyse three fields from the Herschel Multi-tiered Extragalactic Survey (HerMES) programme in all three SPIRE bands (250, 350 and 500 μm); parametrized galaxy number count models are derived to a depth of ∼2 mJy beam−1, approximately four times the depth of previous analyses at these wavelengths, using a probability of deflection [P(D)] approach for comparison to theoretical number count models. Our fits account for 64, 60 and 43 per cent of the far-infrared background in the three bands. The number counts are consistent with those based on individually detected SPIRE sources, but generally inconsistent with most galaxy number count models, which generically overpredict the number of bright galaxies and are not as steep as the P(D)-derived number counts. Clear evidence is found for a break in the slope of the differential number counts at low flux densities. Systematic effects in the P(D) analysis are explored. We find that the effects of clustering have a small impact on the data, and the largest identified systematic error arises from uncertainties in the SPIRE beam.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Uncontrolled Keywords: cosmology: observations; submillimetre: diffuse background; submillimetre: galaxies
Publisher: Wiley-Blackwell
ISSN: 0035-8711
Last Modified: 04 Jun 2017 02:14
URI: http://orca.cf.ac.uk/id/eprint/10987

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