Contribution of Extragalactic Infrared Sources to CMB Foreground Anisotropy

Abstract

We estimate the level of confusion to Cosmic Microwave Background anisotropy measurements caused by extragalactic infrared sources. CMB anisotropy observations at high resolution and high frequencies are especially sensitive to this foreground. We use data from the COBE satellite to generate a Galactic emission spectrum covering mm and sub-mm wavelengths. Using this spectrum as a template, we predict the microwave emission of the 5319 brightest infrared galaxies seen by IRAS. We simulate skymaps over the relevant range of frequencies (30-900 GHz) and instrument resolutions (10'-10 degrees Full Width Half Max). Analysis of the temperature anisotropy of these skymaps shows that a reasonable observational window is available for CMB anisotropy measurements.

arXiv comment14 pages (LaTex source), 3 PostScript figures. Final version, to appear in ApJLetters May 1. Expanded discussion of systematic errors

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• Cross-correlations as a cosmological carbon monoxide detector
• Predictions on the angular power spectrum of clustered extragalactic point sources at CMB frequencies from flat and all--sky 2D-simulations
• The Cosmic Microwave Background Radiation
• Extragalactic Foregrounds of the Cosmic Microwave Background: Prospects for the MAP Mission
• MAXIMA: A Balloon-Borne Cosmic Microwave Background Anisotropy Experiment
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• The Cosmic Microwave Background: State of the Art
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• Synchrotron Emission from Hot Accretion Flows and the Cosmic Microwave Background Anisotropy