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Herschel-ATLAS: far-infrared properties of radio-loud and radio-quiet quasars

Kalfountzou, E., Stevens, J. A., Jarvis, M. J., Hardcastle, M. J., Smith, D. J. B., Bourne, N., Dunne, Loretta ORCID:, Ibar, E., Eales, Stephen Anthony ORCID:, Ivison, R. J., Maddox, Steve ORCID:, Smith, Matthew W. ORCID:, Valiante, Elisabetta and de Zotti, G. 2014. Herschel-ATLAS: far-infrared properties of radio-loud and radio-quiet quasars. Monthly Notices of the Royal Astronomical Society 442 (2) , pp. 1181-1196. 10.1093/mnras/stu782

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We have constructed a sample of radio-loud and radio-quiet quasars from the Faint Images Radio Sky at Twenty-one centimetres and the Sloan Digital Sky Survey Data Release 7, over the Herschel-ATLAS Phase 1 area (9h, 12h and 14h.5). Using a stacking analysis, we find a significant correlation between the far-infrared (FIR) luminosity and 1.4-GHz luminosity for radio-loud quasars. Partial correlation analysis confirms the intrinsic correlation after removing the redshift contribution, while for radio-quiet quasars, no partial correlation is found. Using a single-temperature grey-body model, we find a general trend of lower dust temperatures in case of radio-loud quasars compared to radio-quiet quasars. Also, radio-loud quasars are found to have almost constant mean values of dust mass along redshift and optical luminosity bins. In addition, we find that radio-loud quasars at lower optical luminosities tend to have on average higher FIR and 250-μm luminosity with respect to radio-quiet quasars with the same optical luminosites. Even if we use a two-temperature grey-body model to describe the FIR data, the FIR luminosity excess remains at lower optical luminosities. These results suggest that powerful radio jets are associated with star formation especially at lower accretion rates.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Publisher: Oxford University Press
ISSN: 0035-8711
Date of Acceptance: 22 April 2014
Last Modified: 27 Oct 2022 10:17

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