Sub-millimeter detections of Spitzer Space Telescope galaxy populations
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.
Keywords
Cite
@article{arxiv.astro-ph/0406028,
title = {Sub-millimeter detections of Spitzer Space Telescope galaxy populations},
author = {S. Serjeant and A. M. J. Mortier and R. J. Ivison and E. Egami and G. H. Rieke and S. P. Willner and D. Rigopoulou and A. Alonso-Herrero and P. Barmby and L. Bei and H. Dole and C. W. Engelbracht and G. G. Fazio and E. Le Floc'h and K. D. Gordon and T. R. Greve and D. C. Hines and J. -S. Huang and K. A. Misselt and S. Miyazaki and J. E. Morrison and C. Papovich and P. G. Perez-Gonzalez and M. J. Rieke and J. Rigby and G. Wilson},
journal= {arXiv preprint arXiv:astro-ph/0406028},
year = {2009}
}
Comments
Accepted for ApJS Spitzer Special Issue. 11 pages, 2 figures