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    Mining the Herschel-Astrophysical Terahertz Large Area Survey: submillimetre-selected blazars in equatorial fields

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    Mining the Herschel- ... (1.327Mb)
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    URI: http://hdl.handle.net/10902/4115
    DOI: 10.1093/mnras/sts680
    ISSN: 0035-8711
    ISSN: 1365-2966
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    Author
    López-Caniego Alcarria, Marcos; González-Nuevo, Joaquín; Massardi, Marcella; Bonavera, Laura; Herranz Muñoz, DiegoAutoridad Unican; Negrello, Mattia; De Zotti, Gianfranco; Carrera Troyano, Francisco JesúsAutoridad Unican; Danese, Luigi; Fleuren, Simone; Hardcastle, Martin J.; Jarvis, Matt J.; Klöckner, Hans Rainer; Mauch, Tom; Procopio, Pietro; Righini, Simona; Sutherland, William J.; Auld, Robbie, R.; Baes, Maarten; [et al.]
    Date
    2013-04
    Derechos
    © 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
    Publicado en
    Monthly Notices of the royal astronomical Society, vol. 430, Iss. 3 Pag. 1566-1577. (2013)
    Publisher
    Royal Astronomical Society
    Enlace a la publicación
    http://dx.doi.org/10.1093/mnras/sts680
    Palabras clave
    BL Lacertae objects: general
    Quasars: general
    Submillimeter: general
    Abstract:
    The Herschel-Astrophysical Terahertz Large Area Survey (H-ATLAS) provides an unprecedented opportunity to search for blazars at sub-mm wavelengths. We cross-matched the Faint Images of the Radio Sky at Twenty-cm (FIRST) radio source catalogue with the 11 655 sources brighter than 35 mJy at 500 μm in the ∼135 deg2 of the sky covered by the H-ATLAS equatorial fields at 9h and 15h, plus half of the field at 12h. We found that 379 of the H-ATLAS sources have a FIRST counterpart within 10 arcsec, including eight catalogued blazars (plus one known blazar that was found at the edge of one of the H-ATLAS maps). To search for additional blazar candidates we have devised new diagnostic diagrams and found that known blazars occupy a region of the log (S500 μm/S350 μm) versus log (S500 μm/S1.4 GHz) plane separated from that of sub-mm sources with radio emission powered by star formation, but shared with radio galaxies and steep-spectrum radio quasars. Using this diagnostic we have selected 12 further possible candidates that turn out to be scattered in the (r − z) versus (u − r) plane or in the Wide-Field Infrared Survey Explorer colour–colour diagram, where known blazars are concentrated in well defined strips. This suggests that the majority of them are not blazars. Based on an inspection of all the available photometric data, including unpublished VISTA Kilo-degree Infrared Galaxy survey photometry and new radio observations, we found that the spectral energy distributions (SEDs) of only one out of the 12 newly selected sources are compatible with being synchrotron dominated at least up to 500 μm, i.e. with being a blazar. Another object may consist of a faint blazar nucleus inside a bright star-forming galaxy. The possibility that some blazar hosts are endowed with active star formation is supported by our analysis of the SEDs of Planck Early Release Compact Source Catalogue blazars detected at both 545 and 857 GHz. The estimated rest-frame synchrotron peak frequencies of H-ATLAS blazars are in the range 11.5 ≤ log (νpeak, Hz) ≤ 13.7, implying that these objects are low synchrotron peak. Six of them also show evidence of an ultraviolet excess that can be attributed to emission from the accretion disc. Allowing for the possibility of misidentifications and of contamination of the 500 μm flux density by the dusty torus or by the host galaxy, we estimate that there are seven or eight pure synchrotron sources brighter than S500 μm = 35 mJy over the studied area, a result that sets important constraints on blazar evolutionary models.
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    UNIVERSIDAD DE CANTABRIA

    Repositorio realizado por la Biblioteca Universitaria utilizando DSpace software
    Contact Us | Send Feedback
    Metadatos sujetos a:licencia de Creative Commons Reconocimiento 3.0 España