Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 323/742 Spitzer Space Telescope − Directors Discretionary Time Proposal #493 Bolometric Luminosities of 3 New Bright Lensed Galaxies Principal Investigator: Jane Rigby Institution: OCIW Technical Contact: Jane Rigby, OCIW Co−Investigators: Mike Gladders, U. Chicago Casey Papovich, Texas A&M Hsiao−Wen Chen, U. Chicago Science Category: high−z galaxies Observing Modes: IracMap IrsMap Hours Approved: 6.1 Abstract: We propose DDT observations of three recently−−discovered, very bright, lensed galaxies. We propose IRAC, 24, and 70 um photometry and IRS LL1 spectra for SDSS1226+2152, an extremely bright UV−−selected galaxy at z=2.93. Because this galaxy is a full magnitude brighter in g−band than cB58 (the longstanding Rosetta Stone), its optical spectrum provides a resolved, high−S/N window into stellar populations, star formation, and star formation history at high redshift. Spitzer observations will constrain the stellar mass, measure the bolometric luminosity, and measure the 7.7um aromatic luminosity. Because this galaxy was not discovered until Jan 2008, it could not have been proposed in Cycle 5. We also propose 70um photometry for two UV−selected lensed galaxies at z=1.7 and z=2.73, RCS0327−1326 and SDSS1527+0652. These galaxies were discovered in late 2007. Photometry at 70um will measure the bolometric luminosities of these three galaxies. LL1 spectroscopy for S1226 will accurately measure the 7.7um aromatic luminosity. Together, these observations will enable us to: * determine the spectral energy distributions of Lyman break galaxies; * test whether the strange SED of cB58 is anomalous or typical; * test whether the aromatic−−to−−bolometric luminosity ratios of these galaxies evolve with redshift (as do IR−−selected lensed galaxies); compare near−IR, mid−IR, and optical diagnostics of star formation rate; * and work to understand the relationship between IR−−selected and UV−−selected star−−forming galaxies. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 324/742 Spitzer Space Telescope − General Observer Proposal #30475 Evolution of Star Formation in Galaxy Clusters at z=0.8 Principal Investigator: Kenneth Rines Institution: Yale University Technical Contact: Kenneth Rines, Harvard University Co−Investigators: Rose Finn, Siena College Lisa Kewley, IfA, Hawaii Science Category: high−z galaxies (z>0.5) Observing Modes: IracMap MipsPhot Hours Approved: 2.1 Abstract: In this very short (2.1 hr) program, we propose to study the relations between different tracers of star formation rates in cluster galaxies and their evolution to high redshift. Spitzer enables observations of mid and far−infrared emission from star−forming galaxies at high redshift. We will combine archival and proposed Spitzer observations to conduct detailed studies of the star formation rates (SFRs) of galaxies in four clusters at z~0.80 and compare infrared SFR estimates to optical estimates where extinction is important. At z=0.80, H−alpha is redshifted into a near−infrared window free of strong atmospheric OH lines, enabling deep NIR spectroscopy and narrowband imaging. SFRs at high redshifts are often estimated from UV continuum or [OII] emission; these tracers may underestimate true SFRs by a factor of 2 at this redshift. Infrared observations of clusters at moderate redshift show that IR estimates of the total SFR in some clusters is 10−100 times larger than the total found in galaxies with [OII] emission. Combining the proposed Spitzer observations with Subaru spectroscopy and HST and Chandra data will (1) directly measure the relations between various SFR tracers and their evolution, (2) determine the impact of metallicity and extinction on these estimates, (3) measure correlations between SFRs and density, (4) measure the impact of the hot intracluster medium on SFRs, and (5) improve our understanding of systematic uncertainties in estimating the star formation history of clusters and the universe. Thursday March 25, 2010 xgal_covers.txt 162/371
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 325/742 Spitzer Space Telescope − General Observer Proposal #40793 Water ice and warm CO in extremely obscured ULIRGs at z~2 Principal Investigator: Anna Sajina Institution: Spitzer Science Center Technical Contact: Anna Sajina, Spitzer Science Center Co−Investigators: Lin Yan, Spitzer Science Center Henrik Spoon, Cornell University Kalliopi Dasyra, Spitzer Science Center Moshe Elitzur, University of Kentucky Science Category: high−z galaxies (z>0.5) Observing Modes: IrsMap IrsStare Hours Approved: 40.6 Abstract: Spitzer spectra have enabled detailed studies of the physical properties of the dense, obscuring medium surrounding local deeply embedded nuclei. We propose to extend these studies to z~2 with observations of a sample of 10 z~2 highly obscured ULIRGs, selected from our existing large sample. By obtaining high S/N ratio spectra covering the rest−frame 3−8 microns for this sample we can derive a quantitative description of: (1) the hot inner obscuring shell as given by the 3−5micron hot dust continuum, and the 4.67micron CO gas absorption feature; (2) the cold outer obscuring shell as given by the silicate feature and 3.0 and 6.0micron water ice absorption; and (3) the star−formation activity outside the buried nucleus as probed by the PAH 6.2 micron feature. The proposed spectra will allow a direct comparison with ongoing studies of highly obscured sources locally. Given the upcoming end of the Spitzer mission, and hence lack of opportunity in the near future for mid−IR spectroscopy of high−z ULIRGs, the proposed data will be invaluable in current and future efforts to understand these enigmatic sites of black hole growth and nuclear star formation. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 326/742 Spitzer Space Telescope − Legacy General Observer Proposal #20070 S−COSMOS: The Spitzer Deep Survey of the HST COSMOS 2−Degreee ACS Field Principal Investigator: David Sanders Institution: University of Hawaii Technical Contact: David Sanders, University of Hawaii Co−Investigators: Nick Scoville, California Institute of Technology Bahram Mobasher, Space Telescope Science Institute Mauro Giavalisco, Space Telescope Science Institute Alberto Franceschini, Universita di Padova Kartik Sheth, Spitzer Science Center, IPSC, Caltech Jason Surace, Spitzer Science Center, IPAC, Caltech David Frayer, Spitzer Science Center, IPAC, Caltech Alvio Renzini, European Southern Observatory − Garching Herve Aussel, CNRS − Saclay George Helou, Spitzer Science Center, IPAC, Caltech Lin Yan, Spitzer Science Center, IPAC, Caltech Chris Impey, University of Arizona Andrew Blain, California Institute of Technology Bidushi Battacharya, Spitzer Science Center, IPAC, Caltech Daniela Calzetti, Space Telescope Science Institute Chris Carilli, Associated Universities, Inc. (NRAO) Eva Schinnerer, MPE − Heidelberg Marcella Carollo, Eidgenossiche Technische Hochschule (ETH) Andrea Comastri, Universita’ degli Studi di Bologna Emanuele Daddi, University of Arizona Richard Ellis, California Institute of Technology Michael Fall, Space Telescope Science Institute Gunther Hasinger, MPE − Garching Olivier LeFevre, Observatoire de Marseille Anton Koekemoer, Space Telescope Science Institute Michael Liu, University of Hawaii Simon Lilly, Eidgenossiche Technische Hochschule (ETH) Mike Rich, University of California Los Angeles Patrick Shopbell, California Institute of Technology Yoshi Taniguchi, Tohoku University Jonathan Williams, University of Hawaii Meg Urry, Yale University Science Category: high−z galaxies (z>0.5) Observing Modes: IracMap MipsScan Hours Approved: 220.0 Abstract: We propose a deep imaging survey with Spitzer using both the IRAC and MIPS detectors to observe the HST−COSMOS 2−square degree field. COSMOS is a nearly completed HST Treasury program (Cy12−13) that is specifically designed to probe the coupled formation and evolution of galaxies and large−scale structure on scales up to 2x10^14 M_sun during the formative era of galaxy, AGN, and clusters (z~0.5−3). The COSMOS survey also includes extensive muulti−wavelength imaging from X−ray to radio (XMM, GALEX, Subaru, NOAO, VLA and CSO) and spectroscopic surveys (VLT and Magellan). The Spitzer observations proposed here complete this survey with vital infrared coverage at 3−160 microns. IRAC imaging is critical for deriving stellar masses (with minimized extinction); MIPS imaging will be used to determine tar formation rates, and AGN activity for enormous samples of galaxies (> 10^5). COSMOS specifically probes the dependence of morphological properties, star formation, and galaxtic masses on the clustering environment over the last 75% of cosmic history. For the first time, COSMOS will yield statistics of high−redshift sources free from cosmic variance, and enable the discovery and characterization of relatively rare objects. COSMOS is thus the necessary complement to deeper but smaller surveys (e.g. GOODS). Our team will immediately release the Spitzer observations, along with our other multi− wavelength COSMOS data and source catalogs, to the astronomical community to ensure maximum scientific return from this survey. Thursday March 25, 2010 xgal_covers.txt 163/371
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Extragalactic abstracts - IRSA - California Institute of Technology

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