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Title:
The SCUBA Half-Degree Extragalactic Survey (SHADES) - VIII. The nature of faint submillimetre galaxies in SHADES, SWIRE and SXDF surveys
Authors:
Clements, D. L.; Vaccari, M.; Babbedge, T.; Oliver, S.; Rowan-Robinson, M.; Davoodi, P.; Ivison, R.; Farrah, D.; Dunlop, J.; Shupe, Dave; Waddington, I.; Simpson, C.; Furusawa, H.; Serjeant, S.; Afonso-Luis, A.; Alexander, D. M.; Aretxaga, I.; Blain, A.; Borys, C.; Chapman, S.; Coppin, K.; Dunne, L.; Dye, S.; Eales, S. A.; Evans, T.; Fang, F.; Frayer, D.; Fox, M.; Gear, W. K.; Greve, T. R.; Halpern, M.; Hughes, D. H.; Jenness, T.; Lonsdale, C. J.; Mortier, A. M. J.; Page, M. J.; Pope, A.; Priddey, R. S.; Rawlings, S.; Savage, R. S.; Scott, D.; Scott, S. E.; Sekiguchi, K.; Smail, I.; Smith, H. E.; Stevens, J. A.; Surace, J.; Takagi, T.; van Kampen, E.
Affiliation:
AA(Imperial College, London, Blackett Lab, Prince Consort Road, London SW7 2BW), AB(Imperial College, London, Blackett Lab, Prince Consort Road, London SW7 2BW), AC(Imperial College, London, Blackett Lab, Prince Consort Road, London SW7 2BW), AD(Astronomy Centre, University of Sussex, Falmer, Brighton BN1 9QH), AE(Imperial College, London, Blackett Lab, Prince Consort Road, London SW7 2BW), AF(Astronomy Centre, University of Sussex, Falmer, Brighton BN1 9QH), AG(SUPA Institute for Astronomy, University of Edinburgh, Royal Observatory, Edinburgh EH9 3HJ; UK ATC, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ), AH(Department of Astronomy, Cornell University, Space Sciences Building, Ithaca, NY 14853, USA), AI(SUPA Institute for Astronomy, University of Edinburgh, Royal Observatory, Edinburgh EH9 3HJ), AJ(Spitzer Science Center, MS 220-6, Caltech, Jet Propulsion Lab, Pasadena, CA 91125, USA), AK(Astronomy Centre, University of Sussex, Falmer, Brighton BN1 9QH), AL(Astrophysics Research Institute, Liverpool John Moores University, Twelve Quays House, Egerton Wharf, Birkenhead CH41 1LD), AM(Subaru Telescope, National Optical Astronomy Observatory of Japan, 650 N A'ohoku Place, Hilo, HI 96720, USA), AN(CEPSR, Open University, Milton Keynes), AO(Instituto de Astrofisica de Canarias, La Laguna, Spain), AP(Institute for Computational Cosmology, Department of Physics, Durham University, Durham DH1 3LE; Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA), AQ(Instituto Nacional de Astrofisica, Optica y Electronica, Apartado Postal 51 y 216, 72000, Puebla, Pue, Mexico), AR(Caltech, 1200 E California Blvd., Passadena, CA 91125-0001, USA), AS(Caltech, 1200 E California Blvd., Passadena, CA 91125-0001, USA), AT(Caltech, 1200 E California Blvd., Passadena, CA 91125-0001, USA), AU(Institute for Computational Cosmology, Department of Physics, Durham University, Durham DH1 3LE), AV(SUPA Institute for Astronomy, University of Edinburgh, Royal Observatory, Edinburgh EH9 3HJ; The School of Physics and Astronomy, University of Nottingham, University Park, Nottingham NG7 2RD), AW(School of Physics and Astronomy, Cardiff University, 5 The Parade, Cardiff CF24 3YB), AX(School of Physics and Astronomy, Cardiff University, 5 The Parade, Cardiff CF24 3YB), AY(IPAC, MS 100-22, Caltech, JPL, Passadena, CA 91125, USA), AZ(Spitzer Science Center, MS 220-6, Caltech, Jet Propulsion Lab, Pasadena, CA 91125, USA), BA(IPAC, MS 100-22, Caltech, JPL, Passadena, CA 91125, USA), BB(Imperial College, London, Blackett Lab, Prince Consort Road, London SW7 2BW), BC(School of Physics and Astronomy, Cardiff University, 5 The Parade, Cardiff CF24 3YB), BD(Caltech, 1200 E California Blvd., Passadena, CA 91125-0001, USA), BE(Department of Physics and Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver, BC V6T 1Z1, Canada), BF(Instituto Nacional de Astrofisica, Optica y Electronica, Apartado Postal 51 y 216, 72000, Puebla, Pue, Mexico), BG(Joint Astronomy Center, 660 N A'ohoku Place, University Park, Hilo, HI 96720, USA), BH(IPAC, MS 100-22, Caltech, JPL, Passadena, CA 91125, USA; Center for Astrophysics and Space Sciences, University of California San Diego, La Jolla, CA 92063-0424, USA), BI(SUPA Institute for Astronomy, University of Edinburgh, Royal Observatory, Edinburgh EH9 3HJ), BJ(Mullard Space Science Laboratory (MSSL), University College London, Holmbury St Mary, Dorking, Surrey RH5 6NT), BK(Department of Physics and Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver, BC V6T 1Z1, Canada), BL(Centre for Astrophysics Research, Science and Technology Research Institute, University of Hertfordshire, College Lane, Hatfield, Hertfordshire AL10 9AB), BM(Department of Astrophysics, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH), BN(Astronomy Centre, University of Sussex, Falmer, Brighton BN1 9QH), BO(Department of Physics and Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver, BC V6T 1Z1, Canada), BP(SUPA Institute for Astronomy, University of Edinburgh, Royal Observatory, Edinburgh EH9 3HJ), BQ(Subaru Telescope, National Optical Astronomy Observatory of Japan, 650 N A'ohoku Place, Hilo, HI 96720, USA; National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588, Japan), BR(Institute for Computational Cosmology, Department of Physics, Durham University, Durham DH1 3LE), BS(Center for Astrophysics and Space Sciences, University of California San Diego, La Jolla, CA 92063-0424, USA), BT(Centre for Astrophysics Research, Science and Technology Research Institute, University of Hertfordshire, College Lane, Hatfield, Hertfordshire AL10 9AB), BU(Spitzer Science Center, MS 220-6, Caltech, Jet Propulsion Lab, Pasadena, CA 91125, USA), BV(Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Kanagawa 229-8510, Japan), BW(Institute for Astro- and Particle Physics, University of Innsbruck, Technikerstr. 25, A-6020 Innsbruck, Austria)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 387, Issue 1, pp. 247-267. (MNRAS Homepage)
Publication Date:
06/2008
Origin:
MNRAS
MNRAS Keywords:
galaxies: high-redshift , infrared: galaxies , submillimetre
DOI:
10.1111/j.1365-2966.2008.13172.x
Bibliographic Code:
2008MNRAS.387..247C

Abstract

We present the optical-to-submillimetre spectral energy distributions (SEDs) for 33 radio and mid-infrared (mid-IR) identified submillimetre galaxies discovered via the SHADES 850-μm SCUBA imaging in the Subaru-XMM Deep Field (SXDF). Optical data for the sources come from the SXDF and mid- and far-IR fluxes from SWIRE. We obtain photometric redshift estimates for our sources using optical and IRAC 3.6- and 4.5-μm fluxes. We then fit SED templates to the longer wavelength data to determine the nature of the far-IR emission that dominates the bolometric luminosity of these sources. The IR template fits are also used to resolve ambiguous identifications and cases of redshift aliasing. The redshift distribution obtained broadly matches previous results for submillimetre sources and on the SHADES SXDF field. Our template fitting finds that active galactic nuclei, while present in about 10 per cent of our sources, do not contribute significantly to their bolometric luminosity. Dust heating by starbursts, with either Arp220 or M82 type SEDs, appears to be responsible for the luminosity in most sources (23/33 are fitted by Arp220 templates, 2/33 by the warmer M82 templates). 8/33 sources, in contrast, are fitted by a cooler cirrus dust template, suggesting that cold dust has a role in some of these highly luminous objects. Three of our sources appear to have multiple identifications or components at the same redshift, but we find no statistical evidence that close associations are common among our SHADES sources. Examination of rest-frame K-band luminosity suggests that `downsizing' is underway in the submillimetre galaxy population, with lower redshift systems lying in lower mass host galaxies. Of our 33 identifications six are found to be of lower reliability but their exclusion would not significantly alter our conclusions.

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