Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 287/742 Spitzer Space Telescope − General Observer Proposal #50660 Galaxies, AGN, and Environment at z=1: IRAC observations of DEEP2 Principal Investigator: Christine Jones Institution: Smithsonian Astrophysical Observatory Technical Contact: Ryan Hickox, Harvard−SAO Co−Investigators: Alison Coil, University of Arizona Benjamin Weiner, University of Arizona Kevin Bundy, University of Toronto Michael Cooper, University of Arizona Richard Cool, University of Arizona Darren Croton, University of California, Berkeley Marc Davis, University of California, Berkeley Peter Eisenhardt, JPL Daniel Eisenstein, University of Arizona Sandy Faber, UCSC/UCO Lick William Forman, SAO David Koo, UCSC/UCO Lick Stephen Murray, SAO Casey Papovich, University of Arizona Daniel Stern, JPL Christopher Willmer, University of Arizona Steven Willner, SAO Science Category: high−z galaxies (z>0.5) Observing Modes: IracMap Hours Approved: 16.6 Abstract: The Spitzer view of the z=1 Universe is spectroscopy starved. Only 5 sq. deg. of the sky have been surveyed with very deep (24th mag) spectroscopy that probes z>1 galaxies, and only about half of this area has been observed with Spitzer. Cosmic variance is severe even at z>1 and limits our ability to measure the evolution of galaxies and AGN at these epochs. DEEP2 is the premier z>1 wide−field survey, but only 1.5 sq. deg. of it has Spitzer coverage. Here we propose to more than double the overlap between Spitzer and DEEP2, with IRAC coverage of two fields that contain ~16,000 high−quality Keck spectra of galaxies at 0.7
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 289/742 Spitzer Space Telescope − General Observer Proposal #50783 Interstellar Dust in Distant Galaxies: A Spitzer Study of Dusty Damped Lyman−alpha Absorbers Principal Investigator: Varsha Kulkarni Institution: Univ. of South Carolina Technical Contact: Varsha Kulkarni, Univ. of South Carolina Co−Investigators: Daniel E. Welty, University of Chicago Donald G. York, University of Chicago Giovanni Vladilo, Osservatorio Astronomico di Trieste Science Category: high−z galaxies (z>0.5) Observing Modes: IrsStare Hours Approved: 36.3 Abstract: Understanding the nature of interstellar dust grains in distant galaxies is crucial for investigating the chemical evolution of galaxies and for correcting observations of high−redshift objects used for cosmological studies. However, very little is known about the nature of dust in the distant Universe. Absorption line systems in quasar spectra, especially the damped Lyman−alpha (DLA) absorbers, provide excellent venues for directly studying dust in distant galaxies, selected independently of the galaxy luminosities. A subset of dusty metal−rich absorption systems has been discovered using the Sloan Digital Sky Survey and radio surveys. These absorbers appear to be more massive and chemically more evolved than the general DLA population, and may contribute significantly to the global metal content. Here we propose IR spectroscopy of 10 quasars with intervening dusty DLAs to study the 9.7 micron silicate absorption feature, and in a few cases also the 18 micron silicate feature. In a recent exploratory study, we have made the first identifications of the silicate features in a few DLAs with Spitzer IRS spectra, and developed the techniques for analyzing them. Although relatively shallow, the features can be detected at a statistical level of > 10−15 sigma. The profile of the detected features resembles those seen in diffuse interstellar clouds, and in laboratory amorphous olivine. The features appear to be somewhat deeper than expected from the tau_{9.7} vs. E(B−V) relation for Galactic diffuse interstellar clouds, suggesting different dust extinction properties. We now wish to examine whether these properties are common in other DLAs and study trends with redshift, metallicity, and depletions, by studying the silicate features in other DLAs. Our sample contains both diffuse and molecular clouds spanning look−back times of 2−9 Gyr. Spitzer IRS is the only instrument available to further explore the new window on the dust in the distant Universe opened up by our exploratory study. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 290/742 Spitzer Space Telescope − General Observer Proposal #30873 The ages and star formation rates of massive galaxies at z=2−3 Principal Investigator: Ivo Labbe Institution: Carnegie Instition of Washington Technical Contact: Ivo Labbe, Carnegie Instition of Washington Co−Investigators: Eric Gawiser, Yale Pieter van Dokkum, Yale Pauline Lira, U. Chile Jiasheng Huang, CfA Garth Illingworth, UC Santa Cruz Marijn Franx, Leiden Observatory Danilom Marchesini, Yale Ryan Quadri, Yale Tracy Webb, McGill Mariska Kriek, Leiden Observatory Greg Rudnick, NOAO Science Category: high−z galaxies (z>0.5) Observing Modes: IracMap MipsPhot Hours Approved: 27.4 Abstract: Using deep multiwavelength surveys from MUSYC, GOODS, and FIRES, and IR selection techniques we are now able to select galaxies at z>2 by stellar mass. Detailed optical−to−infrared photometry has recently revealed that massive M > 10^11 Msun galaxies at z=2−3 are on average already surprisingly red (J_ab − K_ab ~ 1.5). Studies in FIRES and GOODS have demonstrated that IRAC and MIPS are critical to determine the origin of these red colors. Thanks to Spitzer we can now distinguish galaxies that are ‘‘red and dead’’ from those that are actively forming stars and enshrouded by dust. Nevertheless, inferences for galaxy formation scenarios are severely limited by field−to−field variance. Strong clustering causes density fluctuations by more than a factor of 3 on fields the size of GOODS. Worse, current estimates of the space densities of dead galaxies differ by a factor of 10. It is imperative to extend to new and larger fields. Unfortunately, the fundamental obstacle is the lack of sufficiently deep J and K−band imaging in available IRAC fields. Because deep wide area NIR imaging is excessively time−consuming to obtain, we face delays of years before we can improve on current results. Therefore, to immediately enhance the scientific return of IRAC and MIPS, we propose to observe the *only* substantial fields with deep NIR imaging in the J,H, and K−band that are available *now*: the MUSYC survey, comprising 4 fields of 100 arcmin^2 each. These fields are very compelling for follow−up with Spitzer, as they are also the main focus of our Gemini/GNIRS ‘‘Key Science Program’’ obtaining very deep NIR spectra on massive distant galaxies. This unique program is producing dozens of direct measurements of the Balmer/4000 A break and Balmer decrement in z=2−3 massive galaxies, providing independent estimates of the ages, star formation rates, and extinctions. Ultimately, such NIR spectra will be crucial to calibrate the constraints that IRAC and MIPS place on the stellar populations of high redshift galaxies. 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