Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 307/742 Spitzer Space Telescope − General Observer Proposal #50182 The LSD project: stellar mass, dynamics and mass−metallicity relation at z=3 Principal Investigator: Filippo Mannucci Institution: INAF − Istituto di Radioastronomia/Firenze Technical Contact: Filippo Mannucci, INAF−Firenze Co−Investigators: Guido Risaliti, SAO − Smithsonian Astroph. Obs. Roberto Maiolino, INAF − Osservatorio di Roma Giovanni Cresci, MPE − Muenchen Alessandro Marconi, Univ. di Firenze Guia Pastorini, Univ. di Firenze Science Category: high−z galaxies (z>0.5) Observing Modes: IracMap Hours Approved: 22.3 Abstract: A large observational effort with the ESO telescopes allowed us to obtain deep, spatially resolved, near−IR spectra of a complete sample of Lyman−break Galaxies (LBGs) at z~3.1. These observations were used to obtain, for the first time, the metallicity and the dynamical properties of a sample of galaxies that, albeit small, represents the total population of the LBGs. We propose to use IRAC to accurately determine the stellar mass of these galaxies to address two closely related issues: 1) measure the mass−metallicity relation at z~3 and its evolution to z=0, to study the chemical version of galaxy "downsizing’’ and compare the results with the expectations of recent models of galaxy evolution involving stellar and AGN feedback and galaxy merging; 2) compare the dynamical with the stellar mass, and relate these quantities with gas mass, SFR and metallicity to obtain the evolutive stage of the galaxies. The IRAC observations are a crucial step to obtain a reliable stellar mass and obtain a full descriptions of this unique sample of LBGs. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 308/742 Spitzer Space Telescope − General Observer Proposal #3554 The Growth of Stellar Mass at z > 2: Spitzer Imaging of the Gemini Deep Deep Survey Fields Principal Investigator: Patrick McCarthy Institution: Carnegie Institution of Washington Technical Contact: Patrick McCarthy, Carnegie Institution of Washington Co−Investigators: Lin Yan, Spizter Science Center Roberto Abraham, University of Toronto Karl Glazebrook, Johns Hopkins University Hsiao−Wen Chen, MIT Sandra Savaglio, Johns Hopkins University David Crampton, HIA Science Category: high−z galaxies (z>0.5) Observing Modes: IracMap Hours Approved: 10.9 Abstract: We propose to image three of the Gemini Deep Deep Survey fields in the four IRAC bands. We will use the rest−frame 1−3 micron luminosity and our spectroscopic redshifts to measure the stellar mass in galaxies at z ~ 2. Photometric redshifts from the IRAC photometry and our deep 8−band B through K images, as well as on going deep spectroscopy, will allow us to extend our study of stellar masses to higher redshifts and lower masses, thus spanning most of the galaxy assemble epoch. This small program makes maximum use of the unique aspects of Spitzer by building on the deepest redshift survey to date. Thursday March 25, 2010 xgal_covers.txt 154/371
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 309/742 Spitzer Space Telescope − General Observer Proposal #50287 Constraining Galaxy Formation With Passive Stellar Populations at z~1.5 Principal Investigator: Elizabeth McGrath Institution: University of California, Santa Cruz Technical Contact: Elizabeth McGrath, University of California, Santa Cruz Co−Investigators: Alan Stockton, Institute for Astronomy, Univ. of Hawaii Science Category: high−z galaxies (z>0.5) Observing Modes: IracMap Hours Approved: 11.1 Abstract: There is a growing amount of observational evidence from studies of ?passive galaxies? at high redshift that at least some massive galaxies formed very early in the history of the Universe. These galaxies contain stellar populations that are already >1?2 Gyr old at the observed epoch, with no significant recent star formation. At z~1.5, our HST ACS and NICMOS imaging of seven such galaxies reveals a range of morphologies, including exponential disks, deVaucouleurs ellipticals, and even a possible ?dry merger,? where the apparent lack of gas prevents new episodes of merger−induced star formation from occurring. This range in morphologies indicates that several different mechanisms could be important in building up the most massive galaxies in the Universe. In order to place tighter constraints on galaxy formation scenarios, we need to eliminate any remaining doubts about the nature of the stellar populations in these galaxies. Using Spitzer IRAC and improved population syntheses models, we can finally break the age−metallicity degeneracy that plagues shorter−wavelength observations. Photometry from the 4 IRAC bands will constrain the long−wavelength portion of the spectral energy distributions, yielding important information about the dust and metal content of these galaxies, as well as unprecedented accuracy in the age measurements. Together, this information will help constrain when the first major epoch of star formation occurred, and how the first massive galaxies formed. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 310/742 Spitzer Space Telescope − Theoretical Research Proposal #50387 Infrared Properties of High−z Galaxies Principal Investigator: Kentaro Nagamine Institution: University of Nevada, Las Vegas Technical Contact: Kentaro Nagamine, University of Nevada, Las Vegas Science Category: high−z galaxies (z>0.5) Dollars Approved: 50000.0 Abstract: We propose to compute the SEDs of high−redshift galaxies in cosmological hydrodynamic simulations using the spectrophotometric code GRASIL (Silva et al. 1998) with the wavelength coverage from 100 angstroms to 1 meter. The proposed method will improve the earlier work in the treatment of infrared (IR) emission from dust in high−z star−forming galaxies, by performing the calculation in a more ab initio fashion. Based on the computed SEDs and magnitudes in IRAC/MIPS bands, we will generate the light−cone output of galaxies by stitching numerous simulation output, and examine the number counts, redshift distribution, luminosity functions (LFs) and color−color diagrams by comparing with the Spitzer results directly. In particular, we will assess the validity of the recent claim by Lacey et al. that a top−heavy IMF is necessary to explain the strong evolution of mid−IR LF at 0
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Extragalactic abstracts - IRSA - California Institute of Technology

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