Journal
ASTROPHYSICAL JOURNAL
Volume 625, Issue 2, Pages L83-L86Publisher
IOP PUBLISHING LTD
DOI: 10.1086/431217
Keywords
galaxies : active; galaxies : distances and redshifts; galaxies : starburst; infrared : galaxies
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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 for MM J154127 - 6616 from the IRS spectrum z = 2.80 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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