Computer Science
Scientific paper
Aug 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop..499c&link_type=abstract
Spitzer Proposal ID #499
Computer Science
Scientific paper
We propose to obtain the first (and only) significant confusion-limited 16 micron imaging with the Spitzer Space Telescope. We will achieve a sensitivity 3-4 times deeper than any previous 16 micron observation from any facility. We will target the ultradeep IRAC region within GOODS-N, creating a mid-IR legacy field where every Spitzer instrument observed down its respective confusion limit. We will measure galaxy number counts at suitable depth to compare with the deepest measurements at 24 microns. Given the interplay between the number density, luminosity evolution, and spectral properties which change with obscuring material and gas fraction, number counts are inherently complex in the mid-IR. The combination of 24 and 16 micron number counts are required to disentangle the many potential evolutionary scenarios of the LIRGs and ULIRGs at redshifts of z>1.5. Reaching 16 micron depths of 10 uJy, we will for the first time be able to detect MIR emission of a significant percentage of z>1.5 LIRGs in more than one waveband, critical for differentiating the many LIRG/ULIRG models as well as identifying silicate absorption. At the highest redshifts (z>2), deep 16 micron will also provide a measurement of the hot-dust component of Compton-thick AGN candidates.
Bridge Carrie
Chary Ranga Ram
Colbert James
Dickinson Mark
Elbaz David
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