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Mid-Infrared spectroscopy of two luminous submillimeter galaxies atz~ 2.8

Lutz, D., Valiante, Elisabetta, Sturm, E., Genzel, R., Tacconi, L. J., Lehnert, M. D., Sternberg, A. and Baker, A. J. 2005. Mid-Infrared spectroscopy of two luminous submillimeter galaxies atz~ 2.8. Astrophysical Journal 625 (2) , L83. 10.1086/431217

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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.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Publisher: IOP Science
ISSN: 0004-637X
Last Modified: 08 Jan 2020 04:36

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