Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 263/742 Spitzer Space Telescope − General Observer Proposal #30607 The brightest Extremely Red Objects in the Sky from 2MASS/SDSS fields Principal Investigator: Antonis Georgakakis Institution: Imperial College Technical Contact: Antonis Georgakakis, Imperial College Co−Investigators: Kirpal Nandra, Imperial College Ioannis Georgantopoulos, Athens Observatory Michael Rowan−Robinson, Imperial College Science Category: high−z galaxies (z>0.5) Observing Modes: IracMap MipsPhot Hours Approved: 3.8 Abstract: We propose mid− to far−IR photometry to explore the nature of the brightest (K5) on the sky, identified over an unprecedented area of 5300deg2, by cross−correlating SDSS and 2MASS. These systems are over 100 times brighter at any wavelength compared to typical EROs in deep pencil−beam surveys, and they likely represent the most nearby/bright tail of this population. These systems, largely overlooked in the optical, are also likely to be the most massive galaxies in the process of formation we know todate and therefore are interesting in their own right. The proposed mid− and far−IR observations will allow us to explore the nature of this population by deconvolving the different emission components to: (i) assess the relative contribution of AGN/starburst activity to the bolometric luminosity, (ii) quantify the dust properties and estimate stellar masses, (iii) explore similarities with high−z dusty galaxies (e.g. sub−mm sources) and (iv) build a high quality dusty template SED library over a wide wavelength baseline (UV to far−IR) which will provide an invaluable template set for the interpretation of fainter dusty EROs found in deep pencil−beam surveys. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 264/742 Spitzer Space Telescope − General Observer Proposal #50823 Spatially−Resolved Mid−IR Imaging of Lensed Ly−Break Galaxies at z>2 Principal Investigator: Michael Gladders Institution: Carnegie Observatories Technical Contact: Michael Gladders, Carnegie Observatories Science Category: high−z galaxies (z>0.5) Observing Modes: IracMap MipsPhot Hours Approved: 3.6 Abstract: We propose IRS spectroscopy and IRAC and MIPS photometry of two newly discovered bright strongly lensed Lyman−break galaxies (LBGs). These two LBGs are of comparable brightness to the oft−studied MS 1512−cB58, but appear in much greater isolation with respect to the lensing foreground. In particular, both are well isolated from their respective lensing cluster’s central galaxies, even at Spitzer spatial resolution at longer wavelengths. Observations of strongly lensed galaxies such as those proposed here offer a unique and direct window into the spectral properties of starforming galaxies in situ at the peak of the universe’s star formation history. Thursday March 25, 2010 xgal_covers.txt 132/371
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 265/742 Spitzer Space Telescope − Directors Discretionary Time Proposal #496 IRS Observations of a Strongly Lensed LIRG Behind the Bullet Cluster Principal Investigator: Anthony Gonzalez Institution: University of Florida Technical Contact: Anthony Gonzalez, University of Florida Co−Investigators: Marusa Bradac, UCSB Doug Clowe, Ohio University Christine Jones, Harvard−Smithsonian Center for Astrophysics Maxim Markevitch, Harvard−Smithsonian Center for Astrophysics Greg Rudnick, NOAO Casey Papovich, Texas A&M Dennis Zaritsky, University of Arizona Science Category: high−z galaxies Observing Modes: IrsMap IrsPeakupImage Hours Approved: 6.0 Abstract: We propose to observe a luminous infrared galaxy at z~2.7 that is highly lensed (factor of ~50 magnification) by the Bullet Cluster. This galaxy is a strong 24 micron and submillimeter source due to this magnification, yet the intrinsic infrared luminosity of this galaxy is lower than any other obscured galaxies previously observed with IRS at these redshifts. We will use IRS spectra and peak−up imaging to (1) obtain a spectroscopic redshift, (2) quantify the AGN contribution to the observed 24 micron emission, and (3) determine the star−formation rate from the Paschen alpha line. IRS is required because there is no other means of achieving these objectives; DDT is required because the 24 micron data on which this program is based was obtained after the Cycle 5 deadline. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 266/742 Spitzer Space Telescope − Theoretical Research Proposal #20067 Interpreting the SPITZER View of Galaxy Formation and Evolution Principal Investigator: Fabio Governato Institution: University of Washington Technical Contact: Fabio Governato, University of Washington Co−Investigators: Mauro Giavalisco, STSCi Julianne Dalcanton, University of Washington Thomas Quinn, University of Washington Beth Willman, NYU Lucio Mayer, ETH, Zurich Octavio Valenzuela, Univ. of Washington Science Category: high−z galaxies (z>0.5) Dollars Approved: 85000.0 Abstract: We request the equivalent of about 9 months of salary funding for the PI to direct the comparison between the prediction of breakthrough N−body simulations of galaxy formation with the detailed, panchromatic observables of the internal structure of field galaxies provided by GOODS, GLIMPSE and SINGS. We will focus on (a) star formation rates and histories (SFH) as a function of galaxy stellar mass and morphology (b) the cosmic SFH at high redshift (c) the evolution of galaxy sizes and disk surface brightness of spiral galaxies and specifically of the progenitors of our own Milky Way and (d) the evolution of disks and spheroids through dynamical instabilities and the formation of the thick/thin disk components. Our project carries significant improvements over previous work: −We resolve in a full cosmological context the ISM and stellar structure of a small set of galaxies down to giant star−forming regions with a sub−kpc spatial resolution. −We describe SN feedback and star formation with a physically motivated model that reproduces the basic properties of z=0 galaxies. −We will provide predictions directly comparable with observed quantities obtained with Spitzer’s instruments, including the effects of dust reprocessing on the SED of galaxies. −We sample galaxy masses from giant spirals to dwarfs. −We include in our team observers strongly involved with some of the mentioned Spitzer’s surveys. −We will update the freely available and widely used software TIPSY (Theoretical Image Processing System) developed by co−PI T.Quinn to produce images from simulations in the passbands of Spitzer’s instruments. Delivery of results will happen between Summer 05 and Spring 06. 80% of the simulations have been completed to date using 2.5e5 CPU hrs. Thursday March 25, 2010 xgal_covers.txt 133/371
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