Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 219/742 Spitzer Space Telescope − General Observer Proposal #3406 Intermediate Aged Stars at Very High Redshifts: Constraining the Progeny of the Sources Responsible for Re−Ionization Principal Investigator: Malcolm Bremer Institution: Bristol University Technical Contact: Malcolm Bremer, Bristol University Co−Investigators: Matthew Lehnert, MPE Aprajita Verma, MPE Laura Douglas, Bristol University Science Category: high−z galaxies (z>0.5) Observing Modes: IracMap Hours Approved: 13.0 Abstract: We wish to image fields containing more than 20 spectroscopically confirmed z>5 galaxies in the 3.6, 4.5, 5.8 and 8.0 micron bands. When combined with our existing extremely deep optical data on the fields we can determine the complete observed SEDs of the sources to 4.5 microns, and possibly to 8 microns. Using these SEDs we can determine approximate star formation histories for these sources. If they are shown to have undergone bursts or extended periods of star formation to z>10, then this gives strong support for an extended or multiple reionization of the Universe. Non−detections will mean that these sources are undergoing their first burst of star formation at z0.5) Observing Modes: IracMap Hours Approved: 46.0 Abstract: We propose to observe 92 spectroscopically confirmed 4.55 galaxies in GOODS and UDF by probing the bright end and knee of the luminosity function as well as probing a large enough volume to reduce the effects of cosmic variance. Thursday March 25, 2010 xgal_covers.txt 110/371
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 221/742 Spitzer Space Telescope − General Observer Proposal #50126 IRS spectroscopy of a complete, unbiased sample of submm galaxies Principal Investigator: Chris Carilli Institution: National Radio Astronomy Observatory (NRAO) Technical Contact: Chris Carilli, NRAO Co−Investigators: Kartik Sheth, Spitzer Science Center Frank Bertoldi, Bonn University Eva Schinnerer, Max−Planck Institute for Astronomy Dave Sanders, University of Hawaii Nick Scoville, Caltech Herve Aussel, CNRS, Saclay Manuel Aravena, Bonn University James Aguirre, University of Colorado Science Category: high−z galaxies (z>0.5) Observing Modes: IrsStare Hours Approved: 51.5 Abstract: We propose 51.5 hours of IRS spectroscopy of a complete, luminosity limited sample of 12 submm galaxies detected at high significance at 250 GHz (> 5sigma) in the Cosmos field. These observations will address two fundamental questions concerning the submm galaxies: (i) do starbursts dominate the energetics of these systems, and if so, how do the physical conditions compare to lower z, lower luminosity starbursts?, and (ii) is there a substantial (up to 30%) high redshift tail (z > 3.6) of hyper−luminous IR galaxies? Such a high redshift tail provides key leverage into models of massive galaxy formation in the early universe. A major legacy of Spitzer has been the demonstration that accurate redshifts for distant, luminous, dust−obscured star forming galaxies can be derived from the PAH features, in addition to the important physical diagnostics on dust heating and composition that come from such spectra. Observing the high S/N, unbiased Cosmos/MAMBO sample will complete this legacy, and test the theory that submm galaxies represent the formation of large elliptical galaxies in massive, dusty starbursts in dense environments at high redshift. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 222/742 Spitzer Space Telescope − General Observer Proposal #20456 Balancing the Cosmic Energy Budget between AGN and Starbursts in the Great Observatories Origins Deep Survey Principal Investigator: Ranga−Ram Chary Institution: California Institute of Technology Technical Contact: Ranga−Ram Chary, California Institute of Technology Co−Investigators: Mark Dickinson, NOAO David Alexander, Institute for Astronomy, University of Cambridge, Lee Armus, Spitzer Science Center, Caltech Andrew Blain, Caltech David Elbaz, CEA−Saclay, France David Frayer, Spitzer Science Center, Caltech Delphine Marcillac, CEA−Saclay, France Alexandra Pope, University of British Columbia, Canada Douglas Scott, University of British Columbia, Canada Haojing Yan, Spitzer Science Center, Caltech Science Category: high−z galaxies (z>0.5) Observing Modes: IrsStare Hours Approved: 89.0 Abstract: We propose to undertake IRS spectroscopy of 22 cosmologically interesting sources in the GOODS/Hubble Deep Field−North with 24 micron fluxes above 0.3 mJy. 18 of our 22 targets have spectroscopic redshifts between 0.5
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Extragalactic abstracts - IRSA - California Institute of Technology

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