IRS Spectroscopy of Gravitationally Lensed z>1 Infrared-Luminous Galaxies

Details IRS Spectroscopy of Gravitationally Lensed z>1 Infrared-Luminous Galaxies IRS Spectroscopy of Gravitationally Lensed z>1 Infrared-Luminous Galaxies

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sptz.prop30775r&link_type=abstract

Spitzer Proposal ID #30775

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Cosmological deep surveys have detected 24 um sources down to ~50 uJy in a number of well-studied fields (e.g., HDF-N, CDF-S), enabling us to study infrared galaxies out to z~3. Unfortunately, very little is known about the mid-infrared spectral properties of the ~<0.3 millijansky sources that dominate the number counts. At such faint flux levels, IRS spectroscopy becomes prohibitively expensive in terms of exposure time. To examine the mid--infrared spectral properties of sub-mJy 24um sources, we propose an IRS spectroscopic survey that targets gravitationally lensed, z>1, 24 um-selected galaxies behind massive galaxy clusters. These massive clusters have amplified our targets by factors of 3--20 (and in one case, 180!), which would save hundreds of hours in observing time compared to unlensed sources. Thus, we can probe the nature of sources near the 24 um confusion limit with 50 hours of Spitzer time. These IRS spectra will directly constrain the spectral shapes of the faint, z>1 galaxies that constitute ~40% of the 24um deep survey number counts, thus providing crucial constraints to models. They will allow us to estimate the PAH strength in moderate--luminosity galaxies and thus constrain the AGN contribution; to calibrate photometric redshift algorithms; and to explore the faint-end slope of the luminosity function.

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