The 0.9 mJy Sample: Insights on the Mid-Infrared Spectroscopic Properties of Infrared-Luminous Galaxies as a Function of Redshift

Details The 0.9 mJy Sample: Insights on the Mid-Infrared Spectroscopic Properties of Infrared-Luminous Galaxies as a Function of Redshift The 0.9 mJy Sample: Insights on the Mid-Infrared Spectroscopic Properties of Infrared-Luminous Galaxies as a Function of Redshift

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21441602d&link_type=abstract

American Astronomical Society, AAS Meeting #214, #416.02; Bulletin of the American Astronomical Society, Vol. 41, p.682

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Scientific paper

We present Spitzer IRS observations of a flux-limited sample of 150 infrared (IR) luminous galaxies in the Spitzer extragalactic first look survey that are brighter than 0.9 mJy at 24 micron. The sample spans a wide redshift range [0.3,3.5], with a peak at z=1. It primarily comprises ultraluminous IR galaxies at z>1 and luminous IR galaxies at z<1. The spectra indicate that a comparable number of sources have strong, star-formation related features or active-galactic-nucleus (AGN) related continua. A stacking analysis leads to the detection of weak features, such as the 3.3 micron polycyclic aromatic hydrocarbon (PAH) feature and the [NeV] line, which are otherwise hard to detect in individual spectra of high-z galaxies. We investigate whether there are changes in the PAH properties and the profile of the 9.7 micron SiO absorption feature with redshift or luminosity. We test how well mid-IR spectral diagnostics of AGN and star-forming galaxies agree with IR color-color diagram diagnostics. We investigate whether the equivalent widths of PAH features correlate with the near-IR radial extents of the sources, measured from their H-band images that were obtained with NICMOS on board the HST.

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