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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, 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: 04 Jun 2017 08:44

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