Volume 514, May 2010
Science with AKARI
|Number of page(s)||17|
|Published online||03 May 2010|
The AGN fraction of submm-selected galaxies and contributions to the submm/mm-wave extragalactic background light
Department of Physics & Astronomy, The Open University, Milton Keynes MK7 6BJ, UK
2 Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX, UK
3 Department of Physics, University of Lethbridge, 4401 University Drive, Lethbridge, Alberta T1J 1B1, Canada
4 Astrophysics Group, Dept. of Physics, Imperial College London, Prince Consort Road, London SW7 2BW, UK
5 Center for Astrophysics and Space Astronomy, University of Colorado, Boulder, CO80309, USA
6 Instituto Nacional de Astrofísica, Optica y Electrónica (INAOE), Tonantzintla, Puebla, México
7 Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK
8 Cardiff University, School of Physics & Astronomy, Queens Buildings, The Parade, Cardiff CF24 3AA, UK
9 Scottish Universities Physics Alliance (SUPA), Institute for Astronomy, The University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ, UK
10 School of Physics & Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
11 Astronomy Centre, University of Sussex, Falmer, Brighton BN1 9QH, UK
12 Department of Physics and Astronomy, Seoul National University, Shillim-Dong, Kwanak-Gu Seoul 151-742, South Korea
13 Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Kanagawa 229 8510, Japan
14 UK Astronomy Technology Centre, Royal Observatory, Edinburgh EH9 3HJ, UK
15 Space Science Divison, KASI, 61-1, Whaam-dong, Yuseong-gu, Deajeon 305-348, South Korea
16 Astronomy & Space Science Department, Sejong University, 143-747 Seoul, South Korea
17 Department of Astronomy, University of Massachusetts, Amherst, MA01003, USA
18 Department of Astronomy, University of Padova, vic. Osservatorio 2, 35122 Padova, Italy
Accepted: 18 February 2010
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.
Key words: galaxies: starburst / infrared: galaxies / galaxies: active / galaxies: statistics
© ESO, 2010
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