Ultra-Deep MIPS Imaging of the Lockman Hole

Details Ultra-Deep MIPS Imaging of the Lockman Hole Ultra-Deep MIPS Imaging of the Lockman Hole

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50249e&link_type=abstract

Spitzer Proposal ID #50249

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The Lockman Hole is the region on the sky with the lowest HI column density, which translates into the lowest X-ray absorption, lowest dust extinction, and lowest infrared cirrus emission. This makes the Lockman Hole the cosmic window through which the deepest and cleanest images of the Universe can be obtained at a variety of wavelengths. Because of this, it has been the prime target for many deep surveys in the past, and therefore offers superb data sets, especially in the X-ray, submm, and radio. Despite all these advantages the Lockman Hole offers, it has not been imaged with MIPS to the depth comparable to those of GOODS/HDF-N, GOODS/CDF-S, and EGS. Considering that Spitzer is nearing the end of its cryogenic mission, we believe that it is extremely important to conduct equally deep MIPS imaging of the Lockman Hole in Cycle 5. Ultra-deep MIPS imaging of the Lockman Hole is especially crucial for Herschel, which will obtain deep 24'x24' images of the Lockman Hole at 100, 160, 250, 350, and 500 um as part of the Guaranteed time programs. Here, we propose to obtain confusion-limited MIPS maps of the Lockman Hole as an essential part of the Spitzer legacy. Such ultra-deep MIPS maps will nicely complement the Herschel data in the near future. A new and innovative aspect of this proposed program is the attempt to perform absolute calibration of the ultra-deep MIPS maps with carefully designed Total Power Mode observations. Such observations, attempted for the first time here with MIPS, will allow us to characterize the properties of the cosmic infrared background with a much improved accuracy and precision. The ultra-deep maps will also have powerful applications in determining the spectral energy distributions of high-redshift infrared galaxies, and in studying the properties of active galactic nuclei with strong obscuration in the X-ray.

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