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Point Sources

Point Sources. Kevin Huffenberger Caltech postdoctoral fellow, JPL. Challenge and opportunity. Planck Bluebook. Contamination by unresolved sources. WMAP. Hinshaw et al. 2006. Science with sources. Catalog: sensitive with small beams, 30–857 GHz, all-sky.

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Point Sources

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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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