Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 259/742 Spitzer Space Telescope − General Observer Proposal #40363 Deep MIPS−70 and 160−micron Imaging of the z=1.16 SMG−P4 Principal Investigator: David Frayer Institution: California Institute of Technology Technical Contact: David Frayer, California Institute of Technology Co−Investigators: Harry Teplitz, IPAC Lee Armus, IPAC Minh Huynh, IPAC Science Category: high−z galaxies (z>0.5) Observing Modes: MipsPhot Hours Approved: 3.5 Abstract: We propose deep MIPS−70 and 160−micron observations of the z=1.16 submillimeter galaxy (SMG) P4. SMG−P4 is a composite AGN+starburst system showing large PAH equivalent widths indicating that the infrared emission arises predominantly from star−formation activity. The current data suggest that the far−infrared (FIR) spectral energy distribution (SED) is shifted to lower dust temperatures (cooler FIR colors) than that found for most local ULIRGs, but is consistent with the constraints on the high−redshift SMGs from ultradeep 70−micron imaging. Observations at 70 and 160−micron near the FIR peak are needed to constrain the SED, bolometric luminosity, star formation rate, and dust mass of the system. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 260/742 Spitzer Space Telescope − General Observer Proposal #20643 Testing the Preposterous Universe with Infrared Supernovae Principal Investigator: Peter Garnavich Institution: University of Notre Dame Technical Contact: Peter Garnavich, University of Notre Dame Co−Investigators: Chris Stubbs, Harvard−Smithsonian Center for Astrophysics Brian Schmidt, The Australian National University Robert Kirshner, Harvard−Smithsonian Center for Astrophysics Nicholas Suntzeff, CTIO/NOAO Chris Smith, CTIO/NOAO John Tonry, University of Hawaii Alex Filippenko, University of California, Berkeley Kevin Krisciunas, Notre Dame Peter Challis, Harvard−Smithsonian Center for Astrophysics Bruno Leibundgut, European Southern Observatory Adam Riess, STScI Thomas Matheson, NOAO Armin Rest, CTIO/NOAO Alejandro Clocchiatti, Universidad Catolica de Chile Saurabh Jha, University of California, Berkeley Gajus Miknaitis, University of Washington Andy Becker, University of Washington Jason Spyromilio, European Southern Observatory Weidong Li, University of California, Berkeley Jesper Sollerman, Stockholm Observatory Michael Wood−Vasey, Harvard−Smithsonian Center for Astrophysics Maria Elena Salvo, The Australian National University Claudio Aguilera, CTIO/NOAO Ryan Chornock, University of California, Berkeley Stephane Blondin, European Southern Observatory Malcolm Hicken, Harvard−Smithsonian Center for Astrophysics Science Category: high−z galaxies (z>0.5) Observing Modes: IracMap Hours Approved: 83.4 Abstract: The current standard cosmological model has been called "preposterous" because it requires a finely tuned dark energy component. We propose a stringent test of the accelerating universe using type Ia supernovae observed in the infrared rest−frame $K$−band. At redshifts near z=0.6, the K−band slides nicely into the IRAC 3.6 micron band. The infrared has a number of exceptional properties. The effects of dust extinction are minimal, reducing a major systematic that has been suspected of dimming high−redshift supernovae. Also, recent work indicates that type Ia supernovae are true standard candles in the infrared meaning that evolutionary biases will be reduced. We find that good signal−to−noise measurements of 4 type Ia events at z~0.6 will differentiate between an accelerating and low−density universe at more than the 99% confidence level, and make a critical test of the dark energy paradigm. Studying high redshift supernovae in the infrared is not possible from the ground and rest−frame K−band observations can only be done with Spitzer and IRAC. NASA and DOE are currently considering the optimum mission concept to investigate the properties of the dark energy. This proposed experiment will test the feasibility of using SNIa in the infrared as a reliable way of mapping the expansion history of the universe with the Joint Dark Energy Mission. Thursday March 25, 2010 xgal_covers.txt 130/371
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 261/742 Spitzer Space Telescope − Archive Research Proposal #40823 A SIMPLE Proof that Lyman Alpha Emitters are Galaxies in the Act of Formation Principal Investigator: Eric Gawiser Institution: Rutgers Technical Contact: Eric Gawiser, Rutgers Co−Investigators: Kamson Lai, Harvard−Smithsonian CfA Jiasheng Huang, Harvard−Smithsonian CfA Giovanni Fazio, Harvard−Smithsonian CfA Caryl Gronwall, Penn State Robin Ciardullo, Penn State Kevin Schawinski, Oxford Science Category: high−z galaxies (z>0.5) Dollars Approved: 63281.0 Abstract: Lyman Alpha Emitting galaxies (LAEs) seen at high redshift appear to be galaxies in the act of formation. They are currently the most promising candidates for the progenitors of typical spiral galaxies like the Milky Way. The LAEs tend to be younger, lower in mass, and less chemically evolved than the better−studied Lyman Break Galaxies (LBGs). Deep IRAC imaging allows us to study the star formation history of these objects to gain a better understanding of the process of galaxy formation. We will use archival IRAC images of the Extended Chandra Deep Field−South from the SIMPLE (Spitzer IRAC/MUSYC Public Legacy in ECDF−S) and GOODS Legacy Programs combined with ground− and space−based photometry in UBVRIzJK to study the Spectral Energy Distributions of our sample of 162 Lyman Alpha Emitters at z=3.1. 47 of these LAEs have confirmed spectroscopic redshifts. We will perform the identical analysis on a sample of 34 spectroscopically confirmed Lyman Break Galaxies at 2.7
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