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The AGN fraction of submm-selected galaxies and contributions to the submm/mm-wave extragalactic background light

Serjeant, S., Negrello, Mattia ORCID:, Pearson, C., Mortier, A., Austermann, J., Aretxaga, I., Clements, D., Chapman, S., Dye, S., Dunlop, J., Dunne, L, Farrah, D., Hughes, D., Lee, H.-M., Matsuhara, H., Ibar, E., Im, M., Jeong, W.-S., Kim, S., Oyabu, S., Takagi, T., Wada, T., Wilson, G., Vaccari, M. and Yun, M. 2010. The AGN fraction of submm-selected galaxies and contributions to the submm/mm-wave extragalactic background light. Astronomy and Astrophysics 514 , A10-A10. 10.1051/0004-6361/200913483

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We present a comparison of the SCUBA half degree extragalactic survey (SHADES) at 450 μm, 850 μm and 1100 μm with deep guaranteed time 15 μm AKARI FU-HYU survey data and Spitzer guaranteed time data at 3.6-24 μm in the Lockman hole east. The AKARI data was analysed using bespoke software based in part on the drizzling and minimum-variance matched filtering developed for SHADES, and was cross-calibrated against ISO fluxes. Our stacking analyses find AKARI 15 μm galaxies with 200 μJy contribute >10% of the 450 μm background, but only <4% of the 1100 μm background, suggesting that different populations contribute at mm-wavelengths. We confirm our earlier result that the ultra-deep 450 μm SCUBA-2 cosmology survey will be dominated by populations already detected by AKARI and Spitzer mid-infrared surveys. The superb mid-infrared wavelength coverage afforded by combining Spitzer and AKARI photometry is an excellent diagnostic of AGN contributions, and we find that (23-52)% of submm-selected galaxies have AGN bolometric fractions fAGN > 0.3.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QC Physics
Uncontrolled Keywords: galaxies: starburst; infrared: galaxies; galaxies: active; galaxies: statistics
Publisher: EDP Sciences
ISSN: 00046361
Last Modified: 31 Oct 2022 10:11

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