Herschel-ATLAS: blazars in the SDP field

Abstract

To investigate the poorly constrained sub-mm counts and spectral properties of blazars we searched for these in the Herschel-ATLAS (H-ATLAS) science demostration phase (SDP) survey catalog. We cross-matched 500$\mu$m sources brighter than 50 mJy with the FIRST radio catalogue. We found two blazars, both previously known. Our study is among the first blind blazar searches at sub-mm wavelengths, i.e., in the spectral regime where little is still known about the blazar SEDs, but where the synchrotron peak of the most luminous blazars is expected to occur. Our early results are consistent with educated extrapolations of lower frequency counts and question indications of substantial spectral curvature downwards and of spectral upturns at mm wavelengths. One of the two blazars is identified with a Fermi/LAT $\gamma$-ray source and a WMAP source. The physical parameters of the two blazars are briefly discussed.These observations demonstrate that the H-ATLAS survey will provide key information about the physics of blazars and their contribution to sub-mm counts.

5 pages, 2 figures, accepted for publication in A&A (Herschel special issue)

References in corpus (16)

• Herschel Space Observatory - An ESA facility for far-infrared and submillimetre astronomy
• The UKIRT Infrared Deep Sky Survey (UKIDSS)
• The Photodetector Array Camera and Spectrometer (PACS) on the Herschel Space Observatory
• The Herschel-SPIRE instrument and its in-flight performance
• The Spectral Energy Distribution of Fermi bright blazars
• The Herschel ATLAS
• General physical properties of bright Fermi blazars
• The First Catalog of Active Galactic Nuclei Detected by the Fermi Large Area Telescope
• Roma-BZCAT: A multifrequency catalogue of Blazars
• Extragalactic millimeter-wave sources in South Pole Telescope survey data: source counts, catalog, and statistics for an 87 square-degree field
• Component separation methods for the Planck mission
• In-flight calibration of the Herschel-SPIRE instrument
• Blind and non-blind source detection in WMAP 5-year maps
• The extragalactic radio-source population at 95 GHz
• Some estimates of the source counts at Planck Surveyor frequencies, using the 9C survey at 15 GHz
• Filling the Infrared Gap: ISO Observations of 1 Jy BL Lacertae Objects

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• Herschel-ATLAS: First data release of the Science Demonstration Phase source catalogues
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• Co-evolution of Extreme Star Formation and Quasar: hints from {\it Herschel} and the Sloan Digital Sky Survey
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• The bright end of the infrared luminosity functions and the abundance of hyperluminous infrared galaxies
• Identification of New Gamma-Ray Blazar Candidates With Multifrequency Archival Observations
• Galaxy cluster mass density profile derived using the submillimetre galaxies magnification bias
• Selecting a complete sample of blazars in sub-millimetre catalogues
• The Herschel-SPIRE Legacy Survey (HSLS): the scientific goals of a shallow and wide submillimeter imaging survey with SPIRE