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Understanding the Impact of Unresolved Sources on Cosmic Microwave Background Observations

This research explores the contamination of cosmic microwave background (CMB) data by unresolved radio sources, highlighting challenges such as background noise and deblending. The project includes the creation of the first all-sky catalog of submillimeter sources, sensitive to a frequency range of 30–857 GHz. Key findings involve identifying time-variability among 100s to 1,000s of sources, including gigahertz-peaked sources, AGNs, and dusty star-forming galaxies. The work aims to refine thermal source models, improving CMB analysis and offering insights for future observational strategies.

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Understanding the Impact of Unresolved Sources on Cosmic Microwave Background Observations

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  1. Point Sources Kevin Huffenberger Caltech postdoctoral fellow, JPL

  2. Challenge and opportunity Planck Bluebook

  3. Contamination by unresolved sources WMAP Hinshaw et al. 2006

  4. Science with sources • Catalog: sensitive with small beams, 30–857 GHz, all-sky. • Some measure of time-variability. • 100s to 1,000s of radio sources : • Gigahertz peaked and inverted spectrum sources. • AGNs. • SZ clusters. • 10,000s of dusty star forming galaxies: • 1st all-sky catalog of submillimeter sources. • Complements narrower, deeper measurements (e.g. ALMA).

  5. Tool for optical properties • Pointing? • Effective beam? • Pol. calibration? • Scan? • Mapmaking? Many delta-function sources. Complications: • Deblending • Background • Noise Symmetric beam simulation—30 GHz 13 Tant (K)

  6. Best models: Planck source templates • Thermal sources modeled by D. Clements (UK) • IRAS sources, with extrapolations to Planck bands based on 100 & 60 micron fluxes when available • Non-thermal sources by G. De Zotti, J. Gonzalez-Nuevo, M. Massardi, C. Baccigalupi (Italy), L. Toffolatti (Spain), R. Sajac and B. Partridge (US) • Brightest microwave sources (e.g., WMAP) included with known positions, SEDs and polarizations • SZ clusters (J. Bartlett, France) • Other populations modeled from available low frequency source counts

  7. Refine model of thermal sources. Add WMAP 3-yr. sources and other bright radio sources. Include results of southern 20 GHz survey (Ron Ekers, Australia). Ensure wide use of “best” simulated sky model. Source templates: future directions

  8. Simplified source modeling • Quick and dirty catalogs (KMH): • Bright radio sources taken from WMAP. • Other sources Poisson distributed with prescribed number counts. • Simulated source freq. scaling drawn from distribution. • Radio source counts / spectra fit to WMAP. • IR source counts fit to SCUBA counts, dusty gray-body spectrum. • For tests and algorithm validation. • Designer catalogs available by request.

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