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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 315/742 Spitzer Space Telescope − General Observer Proposal #50372 Survey of Paschen Alpha in High Redshift Galaxies Principal Investigator: Casey Papovich Institution: Steward Observatory, U. Arizona Technical Contact: Casey Papovich, Steward Observatory, U. Arizona Co−Investigators: Gregory Rudnick, NOAO Eiichi Egami, University of Arizona Marcia Rieke, University of Arizona Jane Rigby, OCIW Suresh Sivanandam, University of Arizona J.−D. Smith, University of Arizona Christopher WIllmer, University of Arizona Science Category: high−z galaxies (z>0.5) Observing Modes: IracMap IrsMap MipsPhot Hours Approved: 43.2 Abstract: All studies of high redshift galaxies rely on the star formation rates (SFRs) based on local calibrations, normally against neutral hydrogen recombination lines. Of these lines, Paschen−alpha suffers the least from dust extinction, is a direct tracer of the ionizing radiation from young stars. Yet no test of SFR indicators at high redshifts against Paschen−alpha has been attempted. Although for z > 2 Paschen−alpha is accessible to Spitzer/IRS, star−forming galaxies at these redshifts are too faint intrinsically. In Cycle 4, we started a program to measure Paschen−alpha in five gravitationally lensed, star−forming galaxies at 2 < z < 3. Here, we propose to extend this program, obtaining observations of six additional lensed galaxies. We also request joint near−IR spectroscopy and imaging with the Gemini telescopes to measure H−alpha (and H−beta when possible) and to correct the attenuation in Paschen alpha. We will then compare the Paschen alpha line luminosity against other tracers of the SFR commonly used at high redshifts: e.g., the UV luminosity; the rest−frame mid−IR emission features and luminosity; and the far−IR luminosity. Our galaxy sample spans the complete range of star−forming galaxy type at 2 < z < 3, and therefore these measurements will provide our best SFR comparison yet obtained at high redshift. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 316/742 Spitzer Space Telescope − General Observer Proposal #40597 Probing the Peak of the Dust SED of the z=3.9 Quasar APM 08279+5255 Principal Investigator: Dominik Riechers Institution: Max−Planck−Institut fuer Astronomie Technical Contact: Dominik Riechers, Max−Planck−Institut fuer Astronomie Co−Investigators: Fabian Walter, MPIA Axel Weiss, MPIfR Chris Carilli, NRAO Science Category: high−z galaxies (z>0.5) Observing Modes: MipsPhot Hours Approved: 0.2 Abstract: We propose to obtain a total of 111.1 seconds of 24, 70, and 160 Âμm MIPS photometry of the strongly lensed z=3.9 quasar APM 08279+5255, enough to detect the source in all three bands at high signal−to−noise. Our models show that the dust SED is composed of a cold starburst component and a warm AGN component, and it peaks around 100 Âμm. However, the peak itself is poorly constrained so far, and thus also the derived properties (masses, temperatures) of the subcomponents. Together with our existing high resolution observations of the dust and molecular gas, the proposed observations are imperative to further constrain the spectral properties of this unique high redshift source, and thus the processes powering its extreme bolometric luminosity. The unique lensing strength of this distant source allows to obtain the proposed observations very efficiently at an unparalleled high science−to−integration time ratio. Thursday March 25, 2010 xgal_covers.txt 158/371
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 317/742 Spitzer Space Telescope − General Observer Proposal #50784 Star Formation Signatures in Quasar Host Galaxies Throughout Cosmic Times Principal Investigator: Dominik Riechers Institution: Max−Planck−Institut fuer Astronomie Technical Contact: Dominik Riechers, Max−Planck−Institut fuer Astronomie Co−Investigators: Lee Armus, SSC/Caltech Fabian Walter, Max−Planck−Institute for Astronomy (MPIA) Chris Carilli, National Radio Astronomy Observatory (NRAO) Aaron Evans, Stony Brook Patrick Ogle, SSC/Caltech Science Category: high−z galaxies (z>0.5) Observing Modes: IrsStare Hours Approved: 38.9 Abstract: We propose to obtain deep Spitzer IRS spectroscopy of nine QSOs at 1.44 SMG with a secure redshift for the forseeable future thus is through Spitzer DDT, as proposed here. At last grasp, this program will achieve a long−sought yet unachieved goal of the Spitzer mission − to detect PAH emission out to z>4, star formation dominated galaxies. Thursday March 25, 2010 xgal_covers.txt 159/371
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Extragalactic abstracts - IRSA - California Institute of Technology

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