Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 367/742 Spitzer Space Telescope − Directors Discretionary Time Proposal #279 IRS Verification of Candidate z>8 Sources Principal Investigator: Mark Lacy Institution: Spitzer Science Center Technical Contact: Mark Lacy, Spitzer Science Center Co−Investigators: Richard Ellis, Caltech Daniel Stark, Caltech Johan Richard, Caltech Harry Teplitz, SSC Science Category: Cosmology Observing Modes: IrsMap Hours Approved: 47.2 Abstract: The reionization of neutral hydrogen which rendered the Universe transparent to UV photons and terminated the ‘dark ages’ was a landmark event in cosmic history. Determining the nature and redshift distribution of the sources responsible represents the current frontier in studies of the first galactic systems. We request 47.2 hours with IRS to verify the redshifts of two candidate Ly−alpha emitters located from a comprehensive survey for lensed sources in the redshift range 87) played a key role in reionizing the Universe. Thursday March 25, 2010 xgal_covers.txt 184/371
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 369/742 Spitzer Space Telescope − General Observer Proposal #40370 A Unique IR, SZE, and X−ray Galaxy Cluster Survey Principal Investigator: Spencer Stanford Institution: University of California, Davis Technical Contact: Spencer Stanford, University of California, Davis Co−Investigators: Joe Mohr, University of Illinois, Champagne−Urbana Anthony Gonzalez, University of Florida, Gainesville Peter Eisenhardt, JPL Mark Brodwin, Caltech John Carlstrom, University of Chicago Hans Bohringer, MPE Guenther Hasinger, MPE Ruediger Kneissl, MPIfR Science Category: cosmology Observing Modes: IracMap Hours Approved: 77.0 Abstract: We propose to image a single 12 square degree area with IRAC. The area is unique in that it is being imaged by three mm−wave experiments − SPT, ACT, and APEX − as they conduct Sunyaev−Zel’dovich Effect surveys for galaxy clusters. We have also begun to survey with XMM this same area to provide an X−ray selected galaxy cluster catalog. We have already obtained griz images of this area in an NOAO optical imaging survey to provide crucial photometric redshifts at z < 1. The proposed IRAC data will allow us to determine phot−z for the SZE cluster candidates up to at least z = 1.5, to uniformly select galaxies and AGN for carrying out clustering analyses, to estimate galaxy masses, and to cross check the SZE and X−ray cluster selection functions within the same area. Compared to other similar total areas surveyed by IRAC previously, our survey area has the distinct advantages of 1) being targetted by the new generation of mm−wave surveys, and 2) being the target of moderately deep XMM imaging. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 370/742 Spitzer Space Telescope − Archive Research Proposal #50622 Hunting for z’−dropout z > 6.5 Quasars in the SWIRE Legacy Fields Principal Investigator: Gillian Wilson Institution: University of California Riverside Technical Contact: Gillian Wilson, University of California Riverside Co−Investigators: Mark Lacy, Spitzer Science Center / Caltech Jonathan Gardner, Goddard Space Flight Center Howard Yee, University of Toronto Patrick Lowrance, Spitzer Science Center / Caltech Adam Muzzin, Yale University Jason Surace, Spitzer Science Center / Caltech Science Category: cosmology Dollars Approved: 100000.0 Abstract: A total of 13 quasars at 6 < z < 6.43 have been successfully detected by the Sloan Digital Sky Survey (SDSS) and Canada−France High−z Quasar Survey (CFHQS) using an i’−dropout technique. We propose to extend the search for quasars to z > 6.5 by targeting z’−dropout sources using deep z−band imaging from the Spitzer Adaptation of the Red−sequence Cluster Survey (SpARCS) combined with IR imaging from the Spitzer SWIRE Legacy Survey. Extrapolation from the quasar luminosity function suggests that there will be 13 quasars at z > 6, and 2 quasars at z > 8 within the 50 square degrees of the SpARCS/SWIRE fields that are brighter than the SWIRE detection limit. Very high redshift quasars are required as targets for The James Webb Space Telescopes’s scientific goal of studying "The End of the Dark Ages: First Light and Reionization", and the work proposed here would develop techniques which could be applied to a Spitzer Warm Mission Survey for high−redshift quasars. Successful detection of high redshift quasars will require careful matching of the optical and Spitzer catalogs, efficient star−galaxy separation, and extensive modelling of Spitzer colors to distinguish as efficiently as possible between quasars and other extremely red optical−IR "contaminating" sources e.g., cool stars and dusty galaxies. We also propose to search for "Y" dwarfs, the coolest, and as yet undiscovered, class of brown dwarf. Thursday March 25, 2010 xgal_covers.txt 185/371
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Extragalactic abstracts - IRSA - California Institute of Technology

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