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arXiv:astro-ph/0504431 (astro-ph)
[Submitted on 20 Apr 2005]

Title:Mid-infrared spectroscopy of two luminous submillimeter galaxies at z~2.8

Authors:D. Lutz, E. Valiante, E. Sturm, R. Genzel, L.J Tacconi, M.D. Lehnert, A. Sternberg, A.J. Baker
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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. SMMJ02399-0136 at z=2.81 shows a superposition of 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 AGN. We derive a new redshift of z=2.80 for MMJ154127+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.
Comments: Accepted for publication in the Astrophysical Journal Letters. 12 pages, 3 eps figures
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:astro-ph/0504431
  (or arXiv:astro-ph/0504431v1 for this version)
  https://doi.org/10.48550/arXiv.astro-ph/0504431
Journal reference: Astrophys.J. 625 (2005) L83-L86
Related DOI: https://doi.org/10.1086/431217

Submission history

From: Dieter Lutz [view email]
[v1] Wed, 20 Apr 2005 07:47:01 UTC (33 KB)
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