The 60-micron extragalactic background radiation intensity, dust-enshrouded AGNs and the assembly of groups and clusters of galaxies

Abstract

Submillimetre observations reveal a cosmologically significant population of high-redshift dust-enshrouded galaxies. The form of evolution inferred for this population can be reconciled easily with COBE FIRAS and DIRBE measurements of the cosmic background radiation (CBR) at wavelengths >100 microns. At shorter wavelengths, however, the 60-micron CBR intensity reported by Finkbeiner et al. is less easily accounted for. Lagache et al. have proposed that this excess CBR emission is a warm Galactic component, and the detection of the highest-energy gamma-rays from blazars limits the CBR intensity at these wavelengths, but here we investigate sources of this excess CBR emission, assuming that it has a genuine extragalactic origin. We propose and test three explanations, each involving additional populations not readily detected in existing submm-wave surveys. First, dust-enshrouded galaxies with hot dust temperatures, perhaps dust-enshrouded, Compton-thick AGN as suggested by recent deep Chandra surveys. Secondly, a population of relatively low-redshift dusty galaxies with SEDs more typical of the existing submm-selected galaxies, which could plausibly be associated with the assembly of groups and clusters of galaxies. Thirdly, a population of low-luminosity, cool, quiescent spiral galaxies. Hot AGN and the assembly of groups can account for the excess 60-micron background. There are significant problems with the cluster assembly scenario, in which too many bright IRAS sources are predicted. Spiral galaxies have the wrong SEDs to account for the excess. Future wide-field far-IR surveys using SIRTF and Herschel will sample representative volumes of the distant Universe, allowing any hot population of dusty AGNs and forming groups to be detected.

10 pages, 3 figures, in press at MNRAS

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• Upper Limits on the Extragalactic Background Light from the Gamma-Ray Spectra of Blazars
• The radio core of the Ultraluminous Infrared Galaxy F00183-7111: watching the birth of a quasar
• Compact molecular gas emission in local LIRGs among low- and high-z galaxies
• Illuminating the Dark Side of Cosmic Star Formation III: Building the largest homogeneous sample of Radio-Selected Dusty Star-Forming Galaxies in COSMOS with PhoEBO
• A physical model for the origin of the diffuse cosmic infrared background
• Searching for Low-Redshift Hot Dust-Obscured Galaxies
• The Most Distant Galaxies