Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 359/742 Spitzer Space Telescope − General Observer Proposal #3453 IRS spectroscopy of strongly lensed faint high redshift submillimeter galaxies: star formation and extinction Principal Investigator: Paul van der Werf Institution: Leiden Observatory Technical Contact: Colin Borys, Caltech Co−Investigators: Colin Borys, California Institute of Technology Kirsten Kraiberg Knudsen, Leiden Observatory Tracy Webb, Leiden Observatory Andrew Blain, California Institute of Technology Jean−Paul Kneib, California Institute of Technology Science Category: high−z galaxies (z>0.5) Observing Modes: IrsStare Hours Approved: 5.0 Abstract: We propose to obtain IRS (Long−Low) spectra of 2 strongly lensed faint submillimeter galaxies at z=2.5 and 2.8. These galaxies are gravitationally lensed by foreground clusters, with amplification factors >10. Intrinsically however, their 850 micron fluxes are about 0.8 mJy. The sub−mJy submm population is important since the integrated background is believed to be dominated by such galaxies, as inferred from the steepness of the submm counts at brighter flux levels. Lyman break galaxies on the other hand are believed to have somewhat lower fluxes, at the level 0.1−0.4 mJy. Since all of these flux levels are below the blank−field confusion limit, they can only be probed using gravitational lenses. Our sources are thus unique objects, providing the only present opportunity to study the faint submm population at flux levels where the transition towards the relatively unobscured Lyman break galaxies occurs. Here we propose IRS spectroscopy of both of these objects, aimed at characterizing the dusty star forming interstellar medium (ISM) of these faint submm sources. Our spectra will probe the rest−frame 5.5−11 micron region, where aromatic features are diagnostic of star formation, and silicate absorption provides a measure of absorbing material. We will compare the results to local (ultra)luminous infrared galaxies and to similar observations of intrinsically much more luminous sources included in GTO Spitzer programs. The silicate absorption will be especially relevant for the faint submm sources studied here, which may be less obscured than their more luminous cousins, and where the underlying starburst may begin to shine through. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 360/742 Spitzer Space Telescope − General Observer Proposal #40026 Characterizing the Stellar Populations in Lyman−Alpha Emitters and Lyman Break Galaxies at 5.76 galaxies that have both secure spectroscopic redshifts and high−quality infrared photometry (especially with Spitzer/IRAC) is still fairly small. Considering that only several photometric points are available per source, and that many model SEDs are highly degenerate, it is crucial to obtain as many observational constraints as possible for each source to ensure the validity of SED modeling. To better understand the physical properties of high−redshift galaxies, we propose here to conduct HST/NICMOS (72 orbits) and Spitzer/IRAC (102 hours) imaging of spectroscopically confirmed, bright (z6 galaxies? Thursday March 25, 2010 xgal_covers.txt 180/371
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 361/742 Spitzer Space Telescope − Legacy General Observer Proposal #50249 Ultra−Deep MIPS Imaging of the Lockman Hole Principal Investigator: Eiichi Egami Institution: Steward Observatory, University of Arizona Technical Contact: Eiichi Egami, Steward Observatory, University of Arizona Co−Investigators: James Bock, JPL/Caltech Herve Dole, IAS, Paris James Dunlop, ROE, Edingburgh David Elbaz, CEA, Saclay Guenther Hasinger, MPE. Munich Rob Ivison, ROE, Edingburgh Guilaine Lagache, IAS, Paris Dieter Lutz, MPE, Munich Delphine Marcillac, University of Arizona Seb Oliver, University of Sussex Casey Papovich, University of Arizona Jean−Loup Puget, IAS, Paris George Rieke, University of Arizona Manolis Rovilos, MPE, Munich Benjamin Weiner, University of Arizona Christopher Willmer, University of Arizona Science Category: cosmology Observing Modes: MipsScan MipsTp Hours Approved: 101.7 Abstract: The Lockman Hole is the region on the sky with the lowest HI column density, which translates into the lowest X−ray absorption, lowest dust extinction, and lowest infrared cirrus emission. This makes the Lockman Hole the cosmic window through which the deepest and cleanest images of the Universe can be obtained at a variety of wavelengths. Because of this, it has been the prime target for many deep surveys in the past, and therefore offers superb data sets, especially in the X−ray, submm, and radio. Despite all these advantages the Lockman Hole offers, it has not been imaged with MIPS to the depth comparable to those of GOODS/HDF−N, GOODS/CDF−S, and EGS. Considering that Spitzer is nearing the end of its cryogenic mission, we believe that it is extremely important to conduct equally deep MIPS imaging of the Lockman Hole in Cycle 5. Ultra−deep MIPS imaging of the Lockman Hole is especially crucial for Herschel, which will obtain deep 24’x24’ images of the Lockman Hole at 100, 160, 250, 350, and 500 um as part of the Guaranteed time programs. Here, we propose to obtain confusion−limited MIPS maps of the Lockman Hole as an essential part of the Spitzer legacy. Such ultra−deep MIPS maps will nicely complement the Herschel data in the near future. A new and innovative aspect of this proposed program is the attempt to perform absolute calibration of the ultra−deep MIPS maps with carefully designed Total Power Mode observations. Such observations, attempted for the first time here with MIPS, will allow us to characterize the properties of the cosmic infrared background with a much improved accuracy and precision. The ultra−deep maps will also have powerful applications in determining the spectral energy distributions of high−redshift infrared galaxies, and in studying the properties of active galactic nuclei with strong obscuration in the X−ray. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 362/742 Spitzer Space Telescope − Guaranteed Time Observer Proposal #30478 The Evolution of Galaxy Dark Matter and Stellar Mass to z = 1.2 : IRAC Imaging of the Deep Lens Survey Field F2 Principal Investigator: Giovanni Fazio Institution: Harvard−Smithsonian Astrophysical Observatory Technical Contact: Gillian Wilson, Caltech Co−Investigators: Jiasheng Huang, Harvard Smithsonian Center for Astrophysics Mark Lacy, SSC / Caltech Jason Surace, SSC / Caltech Gillian Wilson, California Institute of Technology Science Category: Cosmology Observing Modes: IracMap Hours Approved: 34.5 Abstract: We propose to image 4 square degrees with IRAC (to 120s depth) to carry out a unique project to directly compare the stellar mass content of galaxies with the masses of their dark halos. The IRAC observations will complement a parallel ground−based weak lensing analysis of the same field, currently being undertaken by the Deep Lens Survey (DLS) team. The proposed field is one of five fields comprising the ultradeep BVRz’ 20 square degree DLS survey. We will photometrically (and spectroscopically) subdivide galaxies by redshift, luminosity and morphological type, measure average dark matter halos from the full 20 square degrees and average stellar mass for galaxies of the same type from the 4 square degree field. This dataset will allow us to study the evolution of baryons relative to the dark matter to z = 1.2 Thursday March 25, 2010 xgal_covers.txt 181/371
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