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 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sptz.prop40409r&link_type=abstract

Spitzer Proposal ID #40409

Physics

Scientific paper

MIPS has detected 24um sources down to 50 uJy in 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 ~<300 uJy sources that dominate the number counts, because IRS spectroscopy at these fluxes requires prohibitively expensive exposure times. Last cycle, we began solving this problem by targeting gravitationally lensed 24um sources behind lensing clusters. Their fluxes have been amplified by factors of 3--22. As a result, 1--2 hr integrations per LL setting produce high-quality spectra of sources with apparent flux densities of 500--1000 uJy, but intrinsic flux densities of only 30--250 uJy. To date, we have obtained spectra for 12 sources, showing a range of spectral properties (from PAHs to featureless continua). The goals are to characterize the spectral properties of the sources that dominate the 24um number counts (and how their spectra differ from low-redshift analogues); and test & recalibrate photometric redshift methods for faint 24um sources. These goals require the largest sample possible. Here, we propose IRS spectroscopy of 8 additional targets, newly identified from the MIPS GTO 24um images, and gravitationally amplified 3--10x. We can thus build up the sample necessary to characterize the nature of sources at 24um confusion limit.

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