Extragalactic abstracts - IRSA - California Institute of Technology

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Mar 25, 10 16:24 Spitzer_Approved_Extragalactic Page 327/742 Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 328/742 Spitzer Space Telescope − Legacy General Observer Proposal #30143 S−COSMOS: The MIPS Deep Survey of the COSMOS 2−sqdeg Field Principal Investigator: David Sanders Institution: University of Hawaii Technical Contact: David Frayer, SSC/Caltech Co−Investigators: Nick Scoville, California Institute of Technology Herve Aussel, CNRS − Saclay Mara Salvato, California Institute of Technology David Frayer, Spitzer Science Center, IPAC, Caltech Kartik Sheth, Spitzer Science Center, IPAC, Caltech Jason Surace, Spitzer Science Center, IPAC, Caltech George Helou, Spitzer Science Center, IPAC, Caltech Olivier Ilbert, University of Hawaii Lin Yan, Spitzer Science Center, IPAC, Caltech Andrew Blain, California Institute of Technology Bidushi Bhattacharya, Spitzer Science Center, IPAC, Caltech Daniela Calzetti, Space Telescope Science Institute Peter Capak, California Institute of Technology Chris Carilli, Associated Universities, Inc. (NRAO) Marcella Carollo, Eidgenossiche Technische Hochschule (ETH) Emanuele Daddi, University of Arizona Richard Ellis, California Institute of Technology Michael Fall, Space Telescope Science Institute Alberto Franceschini, Universita di Padova Mauro Giavalisco, Space Telescope Science Institute Gunther Hasinger, MPE − Garching Chris Impey, University of Arizona Anton Koekemoer, Space Telescope Science Institute Olivier LeFevre, Observatoire de Marseille Michael Liu, University of Hawaii Simon Lilly, Eidgenossiche Technische Hochschule (ETH) Bahram Mobasher, Space Telescope Science Institute Alvio Renzini, European Southern Observatory − Garching Mike Rich, University of California Los Angeles Eva Schinnerer, MPE − Heidelberg Patrick Shopbell, California Institute of Technology Yoshi Taniguchi, Tohoku University Meg Urry, Yale University Jonathan Williams, University of Hawaii Science Category: high−z galaxies (z>0.5) Observing Modes: MipsScan Hours Approved: 396.2 Abstract: We propose a deep imaging survey with the Spitzer MIPS detectors to observe the full HST−COSMOS 2−sqdeg field. COSMOS is an approved HST Treasury program 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 formation era of galaxies, AGN, and clusters (z~0.5−2.5). The Spitzer observations proposed here are needed to complement our Cycle2 IRAC−deep imaging of the full COSMOS field, plus the multi−wavelength images of the COSMOS field from X−ray to radio, including very deep multi−band images (20 filters) from the Subaru telescope. The COSMOS field is also currently the target of a massive spectroscopic redshift survey with the VLT (50,000 spectra down to I~25). The MIPS−deep data are critical for deriving star formation rates, and AGN activity of galaxies and their dependence on morphological properties and clustering environment over the last 90% of the cosmic history. For the first time, COSMOS will yield statistics of high−redshift sources with greatly reduced cosmic variance, and enable the discovery and characterization of relatively rare objects. COSMOS is thus the necessary complement to deeper but much smaller (>100x) surveys (GOODS and UDF). As part of our Legacy status, our team will immediately release our Spitzer observations, along with our other Thursday March 25, 2010 xgal_covers.txt 164/371
Mar 25, 10 16:24 Spitzer_Approved_Extragalactic Page 329/742 multi−wavelength COSMOS data and source catalogs, to the astronomical community to ensure maximum scientific return from this survey. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 330/742 Spitzer Space Telescope − Archive Research Proposal #20792 What Drives the Differential Evolution of Lyman Break Galaxies? Principal Investigator: Marcin Sawicki Institution: UCSB Technical Contact: Marcin Sawicki, UCSB Co−Investigators: David Thompson, Caltech Science Category: high−z galaxies (z>0.5) Dollars Approved: 61000.0 Abstract: Analysis of the luminosity function of Lyman Break Galaxies in our deep, wide Keck Deep Fields survey robustly shows that the evolution of the LBG population is differential with luminosity from z~4 to z~3. Two of the possible mechanisms driving this evolution relate to (1) changes in the properties of dust and (2) changes in the duration of starbursting episodes in sub−L* LBGs. We will use archival Spitzer IRAC, HST, and ground−based imaging of GOODS and the HDFs to compare the spectral energy distributions of LBGs as a function of redshift and luminosity and search for related differences in reddening and starburst age. Finding such differences will not only identify the processes responsible for the evolution of the luminosity function but will thereby also point us towards the underlying physical mechanisms that control how galaxies form and evolve at high redshift. The non−detection of such differences will mean that the responsible mechanism lies elsewhere and will give impetus to other lines of attacking the problem. We have experience in analyzing the spectral energy distributions of Lyman Break Galaxies and request salary and other support to allow us to extend our techniques to higher redshifts, larger samples, and fainter objects with no spectroscopic redshifts that we need to help understand the observed evolution of the luminosity function. Significantly, our analysis will compare LBG subsamples in a differential and hence very robust way and thus will help us understand how galaxies are assembled at high redshift. Thursday March 25, 2010 xgal_covers.txt 165/371
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