Sub-millimeter detections of Spitzer Space Telescope galaxy populations

S. Serjeant; A. M. J. Mortier; R. J. Ivison; E. Egami; G. H. Rieke; S. P. Willner; D. Rigopoulou; A. Alonso-Herrero; P. Barmby; L. Bei; H. Dole; C. W. Engelbracht; G. G. Fazio; E. Le Floc'h; K. D. Gordon; T. R. Greve; D. C. Hines; J. -S. Huang; K. A. Misselt; S. Miyazaki; J. E. Morrison; C. Papovich; P. G. Perez-Gonzalez; M. J. Rieke; J. Rigby; G. Wilson

doi:10.1086/422821

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arXiv · astro-ph/0406028

Sub-millimeter detections of Spitzer Space Telescope galaxy populations

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Abstract

We present sub-millimeter statistical detections of galaxies discovered in the 5'x5' Spitzer Early Release Observations (to 4-15 microJy 5 sigma at 3.6-8 microns, 170 microJy at 24 microns) through a stacking analysis of our reanalysed SCUBA 8mJy survey maps, and a Spitzer identification of a new sub-millimeter point source in the 8mJy survey region. For sources detected at 5.8 or 8 microns (154 and 111 sources respectively), we detect positive skews in the sub-millimeter flux distributions at 99.2-99.8% confidence using Kolmogorov-Smirnov tests, at both 850 microns and 450 microns. We also marginally detect the Spitzer 24 micron galaxies at 850 microns at 97% confidence, and place limits on the mean sub-millimeter fluxes of the 3.6 and 4.5 micron sources. Integrating the sub-millimeter fluxes of the Spitzer populations, we find the 5.8 micron galaxies contribute 0.12 +/- 0.05 nW/m^2/sr to the 850 micron background, and 2.4 +/- 0.7 nW/m^2/sr to the 450 micron background; similar contributions are made by the 8 micron-selected sample. We infer that the populations dominating the 5.8 and 8 micron extragalactic background light also contribute around a quarter of the 850 micron background and the majority of the 450 micron background.

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S. Serjeant, A. M. J. Mortier, R. J. Ivison, E. Egami, G. H. Rieke, S. P. Willner, D. Rigopoulou, A. Alonso-Herrero, P. Barmby, L. Bei, H. Dole, C. W. Engelbracht, G. G. Fazio, E. Le Floc'h, K. D. Gordon, T. R. Greve, D. C. Hines, J. -S. Huang, K. A. Misselt, S. Miyazaki, J. E. Morrison, C. Papovich, P. G. Perez-Gonzalez, M. J. Rieke, J. Rigby, G. Wilson. 2004-06-01. Sub-millimeter detections of Spitzer Space Telescope galaxy populations. https://doi.org/10.1086/422821

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