Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 319/742 Spitzer Space Telescope − Guaranteed Time Observer Proposal #30775 IRS Spectroscopy of Gravitationally Lensed z>1 Infrared−Luminous Galaxies Principal Investigator: George Rieke Institution: The University of Arizona Technical Contact: Eiichi Egami, U. Arizona Co−Investigators: Eiichi Egami, Steward Observatory, University of Arizona Jane Rigby, Steward Observatory, University of Arizona Delphine Marcillac, Steward Observatory, University of Arizona Jean−Paul Kneib, OAMP, Marseille/France Graham Smith, University of Birmingham Dean Hines, Space Science Institute Science Category: high−z galaxies (z>0.5) Observing Modes: IrsStare Hours Approved: 49.9 Abstract: Cosmological deep surveys have detected 24 um sources down to ~50 uJy in a number of well−studied fields (e.g., HDF−N, CDF−S), enabling us to study infrared galaxies out to z~3. Unfortunately, very little is known about the mid−infrared spectral properties of the ~1, 24 um−selected galaxies behind massive galaxy clusters. These massive clusters have amplified our targets by factors of 3−−20 (and in one case, 180!), which would save hundreds of hours in observing time compared to unlensed sources. Thus, we can probe the nature of sources near the 24 um confusion limit with 50 hours of Spitzer time. These IRS spectra will directly constrain the spectral shapes of the faint, z>1 galaxies that constitute ~40% of the 24um deep survey number counts, thus providing crucial constraints to models. They will allow us to estimate the PAH strength in moderate−−luminosity galaxies and thus constrain the AGN contribution; to calibrate photometric redshift algorithms; and to explore the faint−end slope of the luminosity function. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 320/742 Spitzer Space Telescope − Guaranteed Time Observer Proposal #40409 IRS Spectroscopy of Gravitationally Lensed z>1 Infrared−Luminous Galaxies Principal Investigator: George Rieke Institution: University of Arizona Technical Contact: Eiichi Egami, University of Arizona Co−Investigators: Jane Rigby, OCIW Eiichi Egami, Univ. of Arizona Delphine Marcillac, Univ. of Arizona Casey Papovich, Univ. of Arizona Christopher Willmer, Univ. of Arizona Johan Richard, Caltech Jean−Paul Kneib, Laboratoire d’Astrophysique de Marseille Graham Smith, Univ Birmingham Dean Hines, Space Science Institute Dario Fadda, NASA Herschel Science Center / Caltech Science Category: high−z galaxies (z>0.5) Observing Modes: IrsMap Hours Approved: 37.9 Abstract: MIPS has detected 24um sources down to 50 uJy in well−studied fields (e.g., HDF−N, CDF−S), enabling us to study infrared galaxies out to z~3. Unfortunately, very little is known about the mid−infrared spectral properties of the ~
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 321/742 Spitzer Space Telescope − Guaranteed Time Observer Proposal #50621 Obscured Activity and Stellar Mass in z~0.7 Post−starburst Galaxies Principal Investigator: George Rieke Institution: The University of Arizona Technical Contact: Aleks Diamond−Stanic, University of Arizona Co−Investigators: Christy Tremonti, University of Arizona John Moustakas, New York University Science Category: high−z galaxies (z>0.5) Observing Modes: IracMap MipsPhot IrsPeakupImage Hours Approved: 11.1 Abstract: We are proposing 3.6−24 micron imaging of a sample of z~0.7 post−starburst galaxies. These galaxies are presumed to be late−stage mergers that have evolved past their ULIRG/quasar phase and are in transition to becoming early−type galaxies. We have detected outflowing winds with velocities ranging from 500−2200 km/s for 2/3 of the sample, so it is tempting to conclude that these spectacular outflows are the result of feedback from an AGN that has expelled cold gas quenched star formation. However, it is not clear that the existing near−UV and optical data are telling the full story. With Spitzer, we can verify whether or not these "post−starburst" galaxies are truly quiescent by measuring the amount obscured star formation and black hole activity. We will also be able to determine how significant the recent starburst event was by accurately measuring stellar mass using the red end of the stellar SED. If these galaxies do have non−negligible dust emission, we will be able to use broad−band colors as blunt tools to measure spectral features and compare to known star−forming galaxies, AGNs, and LIRGs. If not, we will have strong evidence that the feedback event has been able to halt galaxy−wide star formation. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 322/742 Spitzer Space Telescope − Guaranteed Time Observer Proposal #81 The Deep Infrared Sky Principal Investigator: George Rieke Institution: The University of Arizona Technical Contact: Marcia Rieke, The University of Arizona Science Category: high−z galaxies (z>0.5) Observing Modes: IracMap MIPS MipsScan MipsTp Hours Approved: 235.9 Abstract: The Deep Infrared SkyM. Rieke, MouldTo determine the source of the cosmic infrared background requires imaging at sufficiently deep levels to detect the individual sources producing the background. The highest redshift, most luminous sources will be powered by powerful starbursts or by non−thermal process driven by massive black holes in the object’s nucleus. SIRTF photometric data alone will not be able to distinguish these two power sources based on experience from the Ultra−Luminous Infrared Galaxies discovered by IRAS. The simplest method of distinguishing between starbursts and AGN is to examine x−ray fluxes. Three layers of surveying will be used to detect adequate numbers of galaxies at both moderate and faint fluxes. Because only IRAS data are available between 1− and 175μm, some surveying to moderate depth is required to get adequate numbers of galaxies for tying IRAS data to the deepest counts. Deeper surveys will be conducted in selected areas, all with deep x−ray observations. A few SIRTF fields of view will be observed to hard confusion limits. Thursday March 25, 2010 xgal_covers.txt 161/371
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