Mid-Infrared Spectroscopy of High Redshift Submillimeter Galaxies: First Results

Details Mid-Infrared Spectroscopy of High Redshift Submillimeter Galaxies: First Results Mid-Infrared Spectroscopy of High Redshift Submillimeter Galaxies: First Results

2006-10-30

arxiv.org/abs/astro-ph/0610915v2

Astrophys.J.655:L65-L68,2007

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures; accepted to ApJ Letter, small changes from submitted version

Scientific paper

10.1086/512038

We present mid-infrared spectra of 5 submillimeter galaxies at z=0.65-2.38 taken with the Spitzer Space Telescope. Four of these sources, at z<1.5, have strong PAH features and their composite spectrum is well fitted by an M82-like spectrum with an additional power-law component consistent with that expected from AGN activity. Based on a comparison of the 7.7-micron PAH equivalent width and the PAH-to-infrared luminosity ratio of these galaxies with local templates, we conclude that these galaxies host both star-formation and AGN activity, with star-formation dominating the bolometric luminosity. The source at z=2.38 displays a Mrk231-type broad feature at restframe ~8 micron that does not conform to the typical 7.7/8.6 micron PAH complex in starburst galaxies, suggesting a more substantial AGN contribution.

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