Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 675/742 Spitzer Space Telescope − Guaranteed Time Observer Proposal #40455 The clustering and environment of ULIRGs at 0.71 where photometric redshifts are less reliable; the high−quality spectroscopic redshifts provided by the DEEP2 data are key to this project. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 676/742 Spitzer Space Telescope − Guaranteed Time Observer Proposal #40534 IRS spectroscopy of Z~2 ULIRGs Principal Investigator: George Rieke Institution: University of Arizona Technical Contact: Delphine Marcillac, University of Arizona Co−Investigators: Casey Papovich, Steward Observatory Christopher willmer, Steward Observatory Benjamin Weiner, Steward Observatory Dario Fadda, NASA Herschel Science Center / CalTech Science Category: ULIRGS/LIRGS/HLIRGS Observing Modes: IrsMap Hours Approved: 31.2 Abstract: Deep cosmological surveys at infrared and submillimeter wavelengths have revealed a population of sources with very high star formation rates (SFR ~ 2000 Msol/year) at z~2. These sources would form $sim$ 10$^{11}$ M$_{odot}$ in only $sim$ 5$ imes$10$^7$years! If these sources are really dominated by star formation with a such a high SFR, they are an enigma for the coevolution of the mass spheroid and SMBH since no traces of AGNs have been found in them, even though they are forming a large amount of their mass into stars. One possibility is that an AGN is contributing significantly to their IR emission. Another possibility is that they exhibit different MIR−FIR properties than local sources, which could lead to an overestimation of their estimated SFR. We propose to take high quality Spitzer IRS spectra to probe the MIR properties of these sources. We have selected targets from fields with very deep FIR data so we can understand the nature of the sources across the infrared regime. Thursday March 25, 2010 xgal_covers.txt 338/371
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 677/742 Spitzer Space Telescope − Guaranteed Time Observer Proposal #50323 IR spectra, star formation rates, and metallicities in submillimeter galaxies Principal Investigator: George Rieke Institution: The University of Arizona Technical Contact: Benjamin Weiner, Steward Observatory, U. Arizona Co−Investigators: Benjamin Weiner, Steward Observatory Eiichi Egami, Steward Observatory Delphine Marcillac, Steward Observatory Casey Papovich, Steward Observatory Christopher Willmer, Steward Observatory Jane Rigby, Carnegie Observatories Almudena Alonso−Herrero, Instituto de Estructura de la Materia Chad Engelbracht, Steward Observatory Science Category: ULIRGS/LIRGS/HLIRGS Observing Modes: IrsMap MipsPhot Hours Approved: 8.2 Abstract: Sub−millimeter continuum observations probe the long−wavelength side of far−IR dust emission from distant galaxies, detecting cold dust and dusty galaxies at higher redshifts. This makes the sub−mm uniquely sensitive to types of dusty galaxies that are disfavored by shorter−wavelength selection, such as at 24 microns. However, for the same reason, only a relatively small number of sub−mm galaxies have high−quality Spitzer/IRS spectra. We propose to obtain IRS spectra of a carefully selected sample of 7 galaxies with sub−mm detections, firm radio and infrared cross−IDs and positions, sufficient 24 micron flux, and in several cases, detections at 70 and even 160 microns. These galaxies are in fields with deep IRAC and MIPS photometry and sensitive multiwavelength coverage from X−ray to radio. The IRS spectra will determine the restframe mid−IR PAH emission, silicate absorption, and continuum shape. These features along with far−IR dust temperatures and multiwavelength data will enable us to construct SEDs for cool, dusty galaxies at z ~ 0.5−2, and to determine whether the properties of such galaxies are similar to local unusually cool ULIRGs (e.g. Arp 220) or have evolved with redshift. We are also proposing to take deep IRS exposures to measure Brackett alpha, [Ne II] and [Ne III] mid−IR lines in 3 of the galaxies. These lines yield measurements of star formation rate and metallicity that are unaffected by extinction. We will test whether IR−luminous galaxies at z~1 are lower metallicity than local examples, and whether metallicity evolution is affecting far−IR estimates of star formation rate. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 678/742 Spitzer Space Telescope − Guaranteed Time Observer Proposal #50324 IR spectra, star formation rates, and metallicities in submillimeter galaxies Principal Investigator: George Rieke Institution: The University of Arizona Technical Contact: Benjamin Weiner, Steward Observatory, U. Arizona Co−Investigators: Benjamin Weiner, Steward Observatory Eiichi Egami, Steward Observatory Delphine Marcillac, Steward Observatory Casey Papovich, Steward Observatory Christopher Willmer, Steward Observatory Jane Rigby, Carnegie Observatories Almudena Alonso−Herrero, Instituto de Estructura de la Materia Chad Engelbracht, Steward Observatory Science Category: ULIRGS/LIRGS/HLIRGS Observing Modes: Hours Approved: 33.9 Abstract: Sub−millimeter continuum observations probe the long−wavelength side of far−IR dust emission from distant galaxies, detecting cold dust and dusty galaxies at higher redshifts. This makes the sub−mm uniquely sensitive to types of dusty galaxies that are disfavored by shorter−wavelength selection, such as at 24 microns. However, for the same reason, only a relatively small number of sub−mm galaxies have high−quality Spitzer/IRS spectra. We propose to obtain IRS spectra of a carefully selected sample of 7 galaxies with sub−mm detections, firm radio and infrared cross−IDs and positions, sufficient 24 micron flux, and in several cases, detections at 70 and even 160 microns. These galaxies are in fields with deep IRAC and MIPS photometry and sensitive multiwavelength coverage from X−ray to radio. The IRS spectra will determine the restframe mid−IR PAH emission, silicate absorption, and continuum shape. These features along with far−IR dust temperatures and multiwavelength data will enable us to construct SEDs for cool, dusty galaxies at z ~ 0.5−2, and to determine whether the properties of such galaxies are similar to local unusually cool ULIRGs (e.g. Arp 220) or have evolved with redshift. We are also proposing to take deep IRS exposures to measure Brackett alpha, [Ne II] and [Ne III] mid−IR lines in 3 of the galaxies. These lines yield measurements of star formation rate and metallicity that are unaffected by extinction. We will test whether IR−luminous galaxies at z~1 are lower metallicity than local examples, and whether metallicity evolution is affecting far−IR estimates of star formation rate. This is part 2 of program 50323. Thursday March 25, 2010 xgal_covers.txt 339/371
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Extragalactic abstracts - IRSA - California Institute of Technology

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