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Title:
Mid-Infrared Spectroscopy of Two Luminous Submillimeter Galaxies at z ~ 2.8
Authors:
Lutz, D.; Valiante, E.; Sturm, E.; Genzel, R.; Tacconi, L. J.; Lehnert, M. D.; Sternberg, A.; Baker, A. J.
Affiliation:
AA(Max-Planck-Institut für extraterrestrische Physik, Postfach 1312, 85741 Garching, Germany; , , , , , .), AB(Max-Planck-Institut für extraterrestrische Physik, Postfach 1312, 85741 Garching, Germany; , , , , , .), AC(Max-Planck-Institut für extraterrestrische Physik, Postfach 1312, 85741 Garching, Germany; , , , , , .), AD(Max-Planck-Institut für extraterrestrische Physik, Postfach 1312, 85741 Garching, Germany; , , , , , .), AE(Max-Planck-Institut für extraterrestrische Physik, Postfach 1312, 85741 Garching, Germany; , , , , , .), AF(Max-Planck-Institut für extraterrestrische Physik, Postfach 1312, 85741 Garching, Germany; , , , , , .), AG(School of Physics and Astronomy, Tel Aviv University, Ramat Aviv 69978, Israel; .), AH(Department of Astronomy, University of Maryland, College Park, MD 20742-2421 .; Jansky Fellow, National Radio Astronomy Observatory.)
Publication:
The Astrophysical Journal, Volume 625, Issue 2, pp. L83-L86. (ApJL Homepage)
Publication Date:
06/2005
Origin:
UCP
ApJ Keywords:
Galaxies: Active, Galaxies: Distances and Redshifts, Galaxies: Starburst, Infrared: Galaxies
DOI:
10.1086/431217
Bibliographic Code:
2005ApJ...625L..83L

Abstract

Using the Infrared Spectrograph (IRS) on board the Spitzer Space Telescope, we have obtained rest-frame mid-infrared spectroscopy of two bright submillimeter galaxies. SMM J02399-0136 at z=2.81 shows a superposition of polycyclic aromatic hydrocarbon (PAH) emission features and a mid-infrared continuum, indicating significant and roughly equal contributions to its bolometric luminosity from star formation and from a Compton-thick active galactic nucleus. We derive a new redshift of z=2.80 for MM J154127+6616 from the IRS spectrum and find this object is dominated by starburst PAH emission. The rest-frame mid- to far-infrared spectral energy distributions are consistent with these submillimeter galaxies being scaled-up versions of local ultraluminous infrared galaxies. The mid-infrared spectra support the scenario that submillimeter galaxies are sites of extreme star formation and represent a key phase in the formation of massive galaxies.
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