Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 647/742 Spitzer Space Telescope − General Observer Proposal #20375 Of Starbursts and Monsters: An IRS High−resolution Spectroscopic Study of Ultraluminous Infrared Galaxies Principal Investigator: Lee Armus Institution: IPAC Technical Contact: Lee Armus, Spitzer Science Center Co−Investigators: Vassilis Charmandaris, University of Crete Vandana Desai, Caltech Henrik Spoon, Cornell University Lei Hao, Cornell University Berhard Brandl, Leiden University Jeronimo Bernard−Salas, Cornell University Science Category: ULIRGS/LIRGS/HLIRGS Observing Modes: IrsStare Hours Approved: 23.6 Abstract: Ultraluminous infrared galaxies (ULIRGs) generate the power output of quasars, but nearly all of this energy emerges in the mid and far−infrared part of the spectrum. While rare at low−redshift, ULIRGs are resposible for the strong evolution in the mid−IR number counts to z~1, and may dominate the star formation rate density and far−infrared background at z~2−3. The GTO ULIRG program is observing a sample of 110 ULIRGs in the local universe with the IRS. Less than half of these have observations with the high−resolution IRS modules. We propose to observe a sample of 34 ULIRGs from this program in SH and/or LH in order to search for unambiguous proof of buried AGN (via the [NeV] emission line), as well as characterize the warm molecular gas content, the small grain characterisitics and the starburst mass functions, via the H2, PAH, and [NeII], [NeIII], [OIV], [SIV], and [SIII] line flux ratios in the SH and LH IRS spectra. These observations will double the number of ULIRGs will high quality, high−resolution IRS spectra in the archive, and significantly increase the number of ULIRGs observed at z > 0.3, where most of the evolution in the counts of IR−bright galaxies is occuring. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 648/742 Spitzer Space Telescope − Legacy General Observer Proposal #30323 A Spitzer Spectroscopic Survey of a Complete Sample of Luminous Infrared Galaxies in the Local Universe Principal Investigator: Lee Armus Institution: IPAC Technical Contact: Lee Armus, Spitzer Science Center Co−Investigators: Phil Appleton, SSC Ben Chan, IPAC Vassilis Charmandaris, University of Crete Aaron Evans, Stony Broook David Frayer, SSC Justin Howell, IPAC Lisa Kewley, University of Hawaii Steve Lord, IPAC Jason Marshall, Cornell University Joseph Mazzarella, IPAC David Sanders, University of Hawaii Shobita Satyapal, George Mason University Henrik Spoon, Cornell University Eckhard Sturm, MPE Jason Surace, SSC Sylvain Veilleux, University of Maryland Science Category: ULIRGS/LIRGS/HLIRGS Observing Modes: IrsStare Hours Approved: 160.0 Abstract: The IRAS Revised Bright Galaxy Sample (RBGS) is a complete sample of extragalactic objects with IRAS 60−micron flux densities above 5.24 Jy, covering the full sky above abs(b) > 5 degrees. The RBGS objects are the brightest 60−micron sources in the extragalactic sky. The 21 ULIRGs and 182 LIRGs in the RBGS form a complete sample of 203 infrared luminous, local galaxies which are excellent analogs for comparisons with infrared and sub−mm selected galaxies at high redshift. We propose to obtain IRS low and high−resolution spectra of 158 LIRGs in the RBGS which, when taken to gether with the existing or planned GO and GTO observations of the remaining LIRGs and ULIRGs in the RBGS, will provide an unprecedented spectroscopic database of a complete sample of luminous infrared galaxies in the local Universe. The total requested time for this program, including all overheads, is 160 hrs. The primary goals of this proposal are to use the low and high−resolution IRS spectra to (1) search for buried AGN and determine their contribution to the bolometric luminosity, (2) determine the star−formation rates and ages, (3) characterize the state of the ionized and molecular gas, and (4) study the properties of the small and large dust grains and determine if all of these properties are a function of luminosity and/or merger stage. By observing a large sample of LIRGs with the IRS, we can build a unique spectral library that will be invaluable long after the helium on Spitzer runs out. This library will be an essential tool for understanding the galactic merger process, and the genesis of the bulk of the infrared activity at all epochs. The IRS spectra will stand on their own merits, however, when coupled with the IRAC and MIPS images, the ground−based near−infrared data, and the HST ACS and GALEX images, the spectra we request here will form a critical component of a comprehensive, multi−wavelength dataset that will serve as a lasting resource in the true spirit of the Spitzer Legacy program. Thursday March 25, 2010 xgal_covers.txt 324/371
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 649/742 Spitzer Space Telescope − General Observer Proposal #50702 Mapping GOALS: IRS Spectral Mapping of a Complete Sample of LIRGs in the Local Universe Principal Investigator: Lee Armus Institution: Spitzer Science Center Technical Contact: Lee Armus, Spitzer Science Center Co−Investigators: Ben Chan, IPAC Vassilis Charmandaris, University of Crete Aaron Evans, SUNY Stony Brook David Frayer, IPAC Justin Howell, Spitzer Science Center Lisa Kewley, University of Hawaii Steve Lord, IPAC Jason Marshall, JPL Joseph Mazzarella, IPAC Jason Melbourne, California Institute of Technology Andreea Petric, Spitzer Science Center David Sanders, University of Hawaii Eckhard Sturm, MPE Jason Surace, Spitzer Science Center Tatjana Vavilkin, SUNY Stony Brook Sylvain Veilleux, University of Maryland Science Category: ULIRGS/LIRGS/HLIRGS Observing Modes: IrsMap Hours Approved: 56.0 Abstract: The Great Observatory All−sky LIRG Survey (GOALS) targets a complete sample of 203 LIRGS in the local Universe, selected from the IRAS Revised Bright Galaxy Sample (RBGS). The RBGS is a complete sample of 629 galaxies with IRAS 60−micron flux densities above 5.24 Jy, covering the full sky above Galactic latitudes abs(b) > 5 degrees. The RBGS objects are the brightest 60−micron sources in the extragalactic sky, and they span a wide range in morphologies from normal, isolated gas−rich spirals to full mergers. The sample includes numerous nuclear starbursts, Type 1 and 2 Seyfert nuclei, and LINERS. These systems are the best local analogs for comparisons with infrared and sub−mm selected galaxies at high redshift. In Cycles 1 and 3 we were awarded time to image the GOALS sample with IRAC and MIPS, and to obtain nuclear spectra with the IRS. The cycle−3 observations formed the core of a Spitzer Legacy program to obtain and make available IRS nuclear spectra of the GOALS targets. Here we propose to extend and enhance the Spitzer observations of the GOALS sample by obtaining IRS maps in the low−resolution SL and LL slits of 81 LIRGs (in 61 systems) which are close, bright, and highly resolved with IRAC. The primary goals of this proposal are to construct IRS spectral maps which will enable us to (1) explore the ionization state, small and large grain dust properties, and warm molecular gas over the full extent of LIRGs covering a wide range in luminosity and interaction state, and (2) create globally integrated SEDs which, when combined with the existing Spitzer, HST, VLA, NIR, ground−based optical, and proposed Herschel imaging data, will allow us to extend the photometry and spectra from the UV through the radio on matched spatial scales. These spectral maps will complete an unprecedented mid−infrared spectroscopic and photometric survey of luminous infrared galaxies in the local Universe. The total requested time for this program, including all overheads, is 111 hrs. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 650/742 Spitzer Space Telescope − General Observer Proposal #20216 A bridge between ultraluminous and normal galaxies at high redshifts: Spitzer imaging of a unique spectroscopic radio field Principal Investigator: Andrew Blain Institution: Caltech Technical Contact: Andrew Blain, Caltech Co−Investigators: Scott Chapman, Caltech Ian Smail, University of Durham Lee Armus, Caltech/SSC David Frayer, Caltech/SSC David Alexander, University of Cambridge Rob Ivison, UKATC Science Category: ULIRGS/LIRGS/HLIRGS Observing Modes: IracMap MipsPhot Hours Approved: 13.3 Abstract: Ultradeep radio images and Spitzer maps both provide windows on the high−redshift Universe immune to the effects of dust extinction. The very deepest radio sources trace the evolution of star−formation activity at luminosities less than the confusion limit in submm and far−IR surveys, opening a bridge between the most extreme submm−selected galaxies and the optically−selected Lyman−break population: the galaxies at 100−1000 Giga solar luminosities that dominate the far−IR background. We are targeting a VLA image in the Lockman Hole that goes twice as deep as the GOODS−N radio map for complete spectroscopy of the 250 radio sources to build up a compact, densely−sampled 15−arcmin field. These spectra will yield an unparalleled view of both the rate of evolution and the large−scale structure traced by dust−obscured galaxies. Spitzer IRAC and MIPS imaging of this special field will allow an unprecedented census of the rate and spatial distribution of dust−enshrouded high−redshift star formation activity, with MIPS revealing details of the galaxy SEDs, and the relationship between radio and far−IR emission, while IRAC reveals the stellar masses built up in the dust−enshrouded galaxies that could provide the link between current optical and far−IR samples, and which make most of the stars in the Universe today. Thursday March 25, 2010 xgal_covers.txt 325/371
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Extragalactic abstracts - IRSA - California Institute of Technology

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