Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 659/742 Spitzer Space Telescope − Guaranteed Time Observer Proposal #30139 Redshift of 350−micron Selected Galaxy Principal Investigator: Giovanni Fazio Institution: Harvard−Smithsonian Astrophysical Observatory Technical Contact: Steven Willner, Center for Astrophysics Co−Investigators: Steven Willner, Smithsonian Astrophysical Observatory Matt Ashby, Smithsonian Astrophysical Observatory Sophia Khan, Blackett Laboratory, Imperial College London Science Category: ULIRGS/LIRGS/HLIRGS Observing Modes: IrsMap Hours Approved: 3.1 Abstract: The first galaxy discovered by blank field surveys at 350 microns appears on the basis of its spectral energy distribution to be a starburst near z=1. An IRS spectrum from 14 to 35 microns should verify or refute this understanding of the object. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 660/742 Spitzer Space Telescope − General Observer Proposal #30621 IRS spectroscopy of LIRGs in the cluster Cl0024+16 at z=0.4 Principal Investigator: James Geach Institution: Durham University Technical Contact: James Geach, Durham University Co−Investigators: Ian Smail, ICC, Durham Alastair Edge, ICC, Durham Richard Ellis, Caltech Tommaso Treu, UCSB Sean Moran, Caltech Science Category: ULIRGS/LIRGS/HLIRGS Observing Modes: IrsStare Hours Approved: 26.0 Abstract: We propose to use low−resolution IRS spectroscopy to obtain mid−infrared spectra of a representative sample of 13 spectroscopically confirmed members of the cluster Cl0024+16 at z=0.4. We have detected these galaxies at 24um with fluxes >0.6 mJy in a previous MIPS program, implying far−infrared luminosities putting them in the LIRG class. We have demonstrated that the luminous mid−infrared population in rich clusters evolves rapidly with look−back time, at a rate comparable to that in the surrounding field. Our aim is to use the IRS spectra to understand the origin of the mid−infrared emission − either from intense dust−enshrouded star−formation, an active galactic nucleus (AGN), or a combination of both. If we confirm that the mid−infrared emission is produced by star−formation, then these sources would be starbursts with implied star−formation rates of 10s−100 Solar masses per year. This population is missed in optical surveys due to dust obscuration, although such levels of obscured activity are needed to transform the bulge−weak spiral populations which are seen in distant clusters into the bulge−strong S0 populations which dominate such environments locally. Thursday March 25, 2010 xgal_covers.txt 330/371
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 661/742 Spitzer Space Telescope − Guaranteed Time Observer Proposal #40991 An IRS Survey of Infrared Sources in the IRAS and SDSS Principal Investigator: Lei Hao Institution: Cornell University Technical Contact: Lei Hao, Cornell University Co−Investigators: Daniel Weedman, Cornell University Vassilis Charmandaris, University of Crete Jim Houck, Cornell University Henrik Spoon, Cornell University Science Category: ULIRGS/LIRGS/HLIRGS Observing Modes: IrsStare Hours Approved: 24.4 Abstract: We propose to conduct an IRS low−resolution survey of 98 sources in the IRAS and SDSS cross−matched catalogue. The sample covers representative 2/3 of all sources that are optically faint ($r_{petrosian}>16$ mag in the SDSS galaxy sample) and infrared bright ($f(25\\mu m)>100$mJy). This criteria is similar to the one looking for high−redshift dusty sources in various surveys, therefore provide a comparable sample to study the distribution of the spectral properties such as the silicate strengths, PAH emissions, atomic and molecular emission lines, to compare with and understand the high−redshift dusty sources. This sample probes a much lower infrared luminosity than previous large samples on ULIRGs and LIRGs, and gives a different but complementary view on infrared sources in the local universe. The uniform optical spectra and image of the SDSS database is an important auxiliary tool and can be connected with the properties of the IR properties and environmental properties, and help to reveal the evolution of IR sources in the low−luminosity range. This IRS GTO proposal takes 25 hrs. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 662/742 Spitzer Space Telescope − Guaranteed Time Observer Proposal #105 Spectroscopic Study of Distant ULIRGs II Principal Investigator: James R. Houck Institution: Cornell University Technical Contact: Lee Armus, Spitzer Science Center Science Category: ULIRGS/LIRGS/HLIRGS Observing Modes: IracMap IrsStare Hours Approved: 85.3 Abstract: Ultraluminous Infrared Galaxies (ULIRGs) have bolometric luminosities of quasars but they outnumber the QSOs with same optical luminosities. Even though several of the nearby ULIRGs have been studied extensively many questions regarding their dust content and energetics remain, and little is known about the more distant ones. We propose to extend our knowledge of these objects and explore the potential evolution in their properties with redshift by obtaining full low−res spectra of a sample of ULIRGs with redshifts up to 0.5. Thursday March 25, 2010 xgal_covers.txt 331/371
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Extragalactic abstracts - IRSA - California Institute of Technology

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