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Herschel-ATLAS: blazars in the science demonstration phase field

González-Nuevo, J.; De Zotti, G.; Andreani, P.; Barton, E. J.; Bertoldi, F.; Birkinshaw, M.; Bonavera, L.; Buttiglione, S.; Cooke, J.; Cooray, A.; Danese, G.; Dunne, L.; Eales, S.; Fan, L.; Jarvis, M. J.; Klöckner, H.-R.; Hatziminaoglou, E.; Herranz, D.; Hughes, D. H.; Lapi, A.; Lawrence, A.; Leeuw, L.; Lopez-Caniego, M.; Massardi, M.; Mauch, T.; Micha?owski, M. J.; Negrello, M.; Rawlings, S.; Rodighiero, G.; Samui, S.; Serjeant, S.; Vieira, J. D.; White, G.; Amblard, A.; Auld, R.; Baes, M.; Bonfield, D. G.; Burgarella, D.; Cava, A.; Clements, D. L.; Dariush, A.; Dye, S.; Frayer, D.; Fritz, J.; Ibar, E.; Ivison, R. J.; Lagache, G.; Maddox, S.; Pascale, E.; Pohlen, M.; Rigby, E.; Sibthorpe, B.; Smith, D. J. B.; Temi, P.; Thompson, M.; Valtchanov, I. and Verma, A. (2010). Herschel-ATLAS: blazars in the science demonstration phase field. Astronomy & Astrophysics, 518, article no. L38.

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To investigate the poorly constrained sub-mm counts and spectral properties of blazars we searched for these in the Herschel-ATLAS (H-ATLAS) science demonstration phase (SDP) survey catalog. We cross-matched 500 μm 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 γ-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.

Item Type: Journal Item
Copyright Holders: 2010 ESO
ISSN: 1432-0746
Extra Information: 4 pp.
Keywords: Lacertae objects; quasars
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Research Group: Space
Item ID: 25174
Depositing User: Astrid Peterkin
Date Deposited: 08 Dec 2010 10:48
Last Modified: 02 May 2018 13:21
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