Journal article

The 24 micron source counts in deep Spitzer space telescope surveys

C Papovich, H Dole, E Egami, E Le Floc'h, PG Perez-Gonzalez, A Alonso-Herrero, L Bai, CA Beichman, M Blaylock, CW Engelbracht, KD Gordon, DC Hines, KA Misselt, JE Morrison, J Mould, J Muzerolle, G Neugebauer, PL Richards, GH Rieke, MJ Rieke Show all

Astrophysical Journal Supplement Series | IOP PUBLISHING LTD | Published : 2004

Abstract

Galaxy source counts in the infrared provide strong constraints on the evolution of the bolometric energy output from distant galaxy populations. We present the results from deep 24 μm imaging from Spitzer surveys, which include ≈5 × 104 sources to an 80% completeness of ≈60 μJy. The 24 μm counts rapidly rise at near-Euclidean rates down to 5 mJy, increase with a super-Euclidean rate between 0.4 and 4 mJy, and converge below ∼0.3 mJy. The 24 μm counts exceed expectations from nonevolving models by a factor of ≳10 at Sv ∼0.1 mJy. The peak in the differential number counts corresponds to a population of faint sources that is not expected from predictions based on 15 μm counts from the Infrared..

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