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

S. Serjeant, M. Negrello, C. Pearson, A. Mortier, J. Austermann, I. Aretxaga, D. Clements, S. Chapman, S. Dye, J. Dunlop, L. Dunne, D. Farrah, D. Hughes, H-M. Lee, H. Matsuhara, E. Ibar, M. Im, W-S. Jeong, S. Kim, S. OyabuT. Takagi, T. Wada, G. Wilson, M. Vaccari, M. Yun

Research output: Contribution to journalArticlepeer-review


We present a comparison of the SCUBA half degree extragalactic survey (SHADES) at 450 mu m, 850 mu m and 1100 mu m with deep guaranteed time 15 mu m AKARI FU-HYU survey data and Spitzer guaranteed time data at 3.6-24 mu m 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 mu m galaxies with greater than or similar to 200 mu Jy contribute > 10% of the 450 mu m background, but only < 4% of the 1100 mu m background, suggesting that different populations contribute at mm-wavelengths. We confirm our earlier result that the ultra-deep 450 mu m 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 f(AGN) > 0.3.

Original languageEnglish
Article numberA10
Pages (from-to)-
Number of pages17
JournalAstronomy & Astrophysics
Publication statusPublished - May 2010

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