Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 227/742 Spitzer Space Telescope − Directors Discretionary Time Proposal #499 Confusion−Limited 16 Micron Imaging: Completing the Spitzer Legacy Principal Investigator: James Colbert Institution: Spitzer Science Center Technical Contact: James Colbert, Spitzer Science Center Co−Investigators: Harry Teplitz, SSC Carrie Bridge, SSC Claudia Scarlata, SSC Brian Siana, Caltech Mark Dickinson, NOAO David Elbaz, CEA Saclay David Koo, UC Santa Cruz Andrew Phillips, UCO/Lick Delphine Marcillac, Univ. Arizona Casey Papovich, Univ. Arizona Emeric Le Floc’h, University of Hawaii Ranga Chary, SSC Science Category: high−z galaxies Observing Modes: IrsPeakupImage Hours Approved: 15.2 Abstract: We propose to obtain the first (and only) significant confusion−limited 16 micron imaging with the Spitzer Space Telescope. We will achieve a sensitivity 3−4 times deeper than any previous 16 micron observation from any facility. We will target the ultradeep IRAC region within GOODS−N, creating a mid−IR legacy field where every Spitzer instrument observed down its respective confusion limit. We will measure galaxy number counts at suitable depth to compare with the deepest measurements at 24 microns. Given the interplay between the number density, luminosity evolution, and spectral properties which change with obscuring material and gas fraction, number counts are inherently complex in the mid−IR. The combination of 24 and 16 micron number counts are required to disentangle the many potential evolutionary scenarios of the LIRGs and ULIRGs at redshifts of z>1.5. Reaching 16 micron depths of 10 uJy, we will for the first time be able to detect MIR emission of a significant percentage of z>1.5 LIRGs in more than one waveband, critical for differentiating the many LIRG/ULIRG models as well as identifying silicate absorption. At the highest redshifts (z>2), deep 16 micron will also provide a measurement of the hot−dust component of Compton−thick AGN candidates. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 228/742 Spitzer Space Telescope − General Observer Proposal #50183 Starburst or AGN dominance in submm−luminous candidate AGN Principal Investigator: Kristen Coppin Institution: Durham University Technical Contact: Kristen Coppin, Durham University Co−Investigators: Alexandra Pope, NOAO James Dunlop, ROE Rob Ivison, UK−ATC, ROE Dave Alexander, Durham Simon Dye, Cardiff Dave Clements, Imperial College London Michael Rowan−Robinson, Imperial College London Mark Swinbank, Durham Karin Menendez−Delmestre, Caltech Andrew Blain, Caltech Ian Smail, Durham Scott Chapman, Cambridge Douglas Scott, UBC Loretta Dunne, Nottingham David Hughes, INAOE Itziar Aretxaga, INAOE Sebastian Oliver, Sussex Mat Page, University College London Duncan Farrah, Cornell Mattia Vaccari, Padova Eelco van Kampen, Innsbruck Sungeun Kim, Sejong Science Category: high−z galaxies (z>0.5) Observing Modes: IrsMap IrsStare IrsPeakupImage Hours Approved: 58.4 Abstract: It is widely believed that starbursts/ULIRGs and AGN activity are triggered by galaxy interactions and merging; and sub−mm selected galaxies (SMGs) seem to be simply high redshift ULIRGs, observed near the peak of activity. In this evolutionary picture every SMG would host an AGN, which would eventually grow a black hole strong enough to blow off all of the gas and dust leaving an optically luminous QSO. In order to probe this evolutionary sequence, a crucial sub−sample to focus on would be the "missing link" sources, which demonstrate both strong starburst and AGN signatures and to determine if the starburst is the main power source even in SMGs when we have evidence that an AGN is present. The best way to determine if a dominant AGN is present is to look in the mid−IR for their signatures, since often even deep X−ray observations miss identifying the presence of AGN in heavily dust−obscured SMGs. We have selected a sample of SMGs which are good candidates for harboring powerful AGN on the basis of their IRAC colours (S8um/S4.5um>2). Once we confirm these SMGs are AGN−dominated, we can then perform an audit of the energy balance between star−formation and AGN within this special sub−population of SMGs where the BH has grown appreciably to begin heating the dust emission. The proposed observations with IRS will probe the physics of how SMGs evolve from a cold−dust starburst−dominated ULIRG to an AGN/QSO by measuring the level of the mid−IR continuum, PAH luminosity, and Si absorption in these intermediate ‘transitory’ AGN/SMGs. Thursday March 25, 2010 xgal_covers.txt 114/371
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 229/742 Spitzer Space Telescope − Directors Discretionary Time Proposal #250 Mid−IR observations of z=2, BzK selected galaxies Principal Investigator: Emanuele Daddi Institution: NOAO Technical Contact: Emanuele Daddi, NOAO Science Category: high−z galaxies (z>0.5 Observing Modes: MipsPhot Hours Approved: 10.2 Abstract: The cosmic epoch at redshifts between 1.5 and 2.5 appears to be the time of major formation and assembly of massive galaxies. Results from the K20 and other surveys have shown that massive galaxies with seemingly large star−formation rates are common at these epochs. We showed that massive z=2 objects can be readily isolated using photometry in only B, z and K bands. As a part of the Spitzer Fellowship program, we propose to obtain deep 24 micron observations with Spitzer+MIPS of a 350 arcmin square region where about 500 z=2 massive galaxy candidates have been selected through their BzK colors, and for many of which spectroscopic redshifts are being measured from VLT+VIMOS spectra. A large fraction of these galaxies have very red optical colors that suggest severe dust reddening. Measuring the 24 micron emission of massive z=2 galaxies will be crucial to trace the presence of dust, thus constraining their star−formation rates and contribution to the z=2 star−formation rate density. Coupled to the optical−IR photometry and optical spectra that are already available, these observations will allow to better understand the role of BzK selected objects in galaxy formation and assembly at z=2. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 230/742 Spitzer Space Telescope − General Observer Proposal #50512 Mid−IR Spectroscopy of gas−rich disk galaxies at z=1.5 Principal Investigator: Helmut Dannerbauer Institution: MPIA Technical Contact: Helmut Dannerbauer, MPIA Co−Investigators: Emanuele Daddi, CEA David Elbaz, CEA Mark Dickinson, NOAO Glenn Morrision, UH−IfA Hawaii Daniel Stern, JPL, Caltech Science Category: high−z galaxies (z>0.5) Observing Modes: IrsMap Hours Approved: 15.2 Abstract: We have recently obtained the first detection of CO in two ordinary massive z=2 galaxies. These massive disk galaxies were observed with the IRAM Plateau de Bure Interferometer, selected to lie in the mass−star formation rate correlation at z~1.5, thus being representative massive high−z galaxies. The CO detection implies that giant molecular gas reservoirs are present in these sources, with gas fractions reaching 50−70% of the total galaxy masses. With an infrared luminosity of L(FIR)~10^12 L(sun), these BzK disk−like galaxies are borderline ULIRGs but with star formation efficiency similar to local spirals, and an order of magnitude lower than in submm galaxies, unveiling a new formation mode previously unknown in the distant universe. We propose here IRS spectroscopy of these two CO detected galaxies at z=1.5 in order to unveil their mid−IR rest frame spectral properties and measuring the equivalent widths of PAH features at 6.2, 7.7, 8.6 and 11.3 micron and of the 9.7 micron silicate absorption. The extreme richness in molecular gas in these sources should affect their mid−IR spectral properties, and we will investigate how the diversity in gas/star ratios in distant galaxies is important for the interpretation of mid−IR luminosities of the high−z populations. In particular, the fact that these ULIRGs behave like scaled up spiral galaxies in their star formation properties could be reflected in their mid−IR spectral properties. Obtaining the PAH ratios will be crucial to constrain better the CO to H2 mass conversion ratio Xco. These observations will represent a legacy from Spitzer for the years to come for the interpretations of mid−IR properties of distant star forming galaxies. Thursday March 25, 2010 xgal_covers.txt 115/371
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