Mid-IR Ultra-Deep Spectroscopy of the Cosmic Infrared Background

Details Mid-IR Ultra-Deep Spectroscopy of the Cosmic Infrared Background Mid-IR Ultra-Deep Spectroscopy of the Cosmic Infrared Background

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sptz.prop30431y&link_type=abstract

Spitzer Proposal ID #30431

Astronomy and Astrophysics

Astronomy

Scientific paper

We propose to obtain low resolution, mid-IR spectra of a sample of 48 galaxies at z~1 and 2 with 24um flux densities between 0.15-0.5mJy in the CDFS. These sub-mJy 24um sources are shown to dominate the Cosmic Infrared Background (CIB) emission at 70 & 160um (Dole et al. 2006). Their redshift distribution peaks around 1, with a secondary peak at z~2. This implies these sources are LIRGs and ULIRGs at z=1 and 2, respectively. Measurements of IR luminosity functions support these findings and directly show these populations are responsible for more than 70% of the total (UV+IR) luminosity density at z=0.8-2.5. The proposed program is the natural extension of our previous studies of brighter, mJy 24um galaxies. Our primary goal is to characterize the mid-IR spectral properties of the galaxies producing the bulk of CIB. Specifically, we will disentangle the AGN/SB contribution to mid-IR emission, thus constrain the estimate of bolometric luminosities. The proposed spectra, in combination with brighter samples from previous IRS surveys, will allow us to trace the evolution of AGN/SB ratio, strength of PAH emission and mid-IR opacities as a function of L(ir) and z. The deep mid-IR spectra, together with the existing multi-wavelength dataset, will provide the lasting legacy for the astronomical communities for many years to come.

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