Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 331/742 Spitzer Space Telescope − Legacy General Observer Proposal #50286 IRS Legacy Survey of the Green Valley in COSMOS Principal Investigator: Nicholas Scoville Institution: California Institute of Technology Technical Contact: Nicholas Scoville, California Institute of Technology Co−Investigators: Herve Aussel, CNRS / Service d’Astrophysique Lin Yan, Spitzer Science Center / Caltech David Sanders, University of Hawaii Mara Salvato, California Institute of Technology Olivier Ilbert, University of Hawaii Peter Capak, Spitzer Science Center / Caltech Emeric Le Floc’h, University of Hawaii Kartik Sheth, Spitzer Science Center / Caltech David Frayer, Herschel Science Center / Caltech Jason Surace, Spitzer Science Center / Caltech Eva Schinnerer, Max Planck Institute for Astronomy Jean−Paul Kneib, Observatoire Astronomique de Marseille−Provence − Henry McCracken, CNRS, Institut d’Astrophysique de Paris Science Category: high−z galaxies (z>0.5) Observing Modes: IrsStare Hours Approved: 85.6 Abstract: We propose IRS low resolution spectroscopy of a complete flux−limited sample of 116 MIPS 24micron selected galaxies in the HST/ACS−COSMOS survey field at z = 0.3−0.4 and z=0.65−0.85. All of the galaxies have S(24) > 0.7 mJy and confirmed IRAC counterparts. The IRS observations will yield the PAH and silicate features, the mid−IR continuum SED and the Ne emission lines (for the brighter sources). These tracers will provide diagnostics for the nature of the energy sources (starburst and/or AGN) in these dust obscured galaxies. This COSMOS IRS Legacy survey will sample the full range of optical (e.g. U−V) color and absolute optical magnitude exhibited by luminous infrared−selected galaxies at our selected redshifts. Our large and complete sample of 24 micron sources will allow us to better understand the role played by IR−selected galaxies in galaxy evolution, and will provide a critical test of evolutionary models which suggest that sources in the Green Valley represent a transition stage as dusty spirals in the Blue Cloud merge and evolve into massive gas−poor elipticals on the Red Sequence. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 332/742 Spitzer Space Telescope − Directors Discretionary Time Proposal #50030 Unveiling the Mystery of 24−micron−only Sources with IRS Spectrocopy Principal Investigator: David Shupe Institution: Spitzer Science Center Technical Contact: David Shupe, Spitzer Science Center Co−Investigators: Jason Surace, Spitzer Science Center C. Kevin Xu, NASA Herschel Science Center Carol Lonsdale, Univ. of Virginia Seb Oliver, Univ. of Sussex Mari Polletta, IAP Michael Rowan−Robinson, Imperial College, London Matthew Thomson, Univ. of Sussex Duncan Farrah, Cornell University David Frayer, NASA Herschel Science Center Mattia Vaccari, Univ. of Padova Science Category: high−z galaxies (z>0.5) Observing Modes: IrsMap Hours Approved: 4.4 Abstract: Ten 24−micron−only sources have been discovered in a search through the entire 45−square−degree SWIRE survey. These are bright 24 micron sources (F(24) > 0.5 mJy) undetected in any other bands. They represent a rare (1 per 5−15 sq deg) population of the reddest mid−infrared sources known so far. On the basis of lack of proper motion, we rule out the hypothesis that they are asteroids. The very high ratios of 24 micron to IRAC fluxes implied by non−detection of IRAC means that these are very unusual, extremely obscured objects. The non−detections at every other wavelengths to our depths, including the optical and MIPS 70 micron and 160 micron bands, make it even more difficult to explain them with any known populations (e.g. Compton−thick AGNs or obscured starbursts). With detection at only a single wavelength, the only room for exploration accessible is in the mid−infrared, where these sources are detected. We propose, in this last cryogenic cycle, to obtain IRS spectra in order to measure the redshifts and to unveil the nature of these mysterious sources through SED fitting. The LL1 and LL2 modules of the IRS are requested, covering rest frame wavelengths of 4.7−12.7 microns at z=2, 3.5−9.5 microns at z=3, and 2.8−7.6 microns at z=4. If these sources are indeed high−z obscured AGNs or starbursts (but with much higher attenuation than those previously detected), the PAH features or broken power−laws will show up in the IRS spectra. These will further extend our knowledge on these extreme populations. It will be even more exciting if the 24−micron−only sources are found to form an entirely new population! Thursday March 25, 2010 xgal_covers.txt 166/371
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 333/742 Spitzer Space Telescope − General Observer Proposal #30832 The First IRS Spectrum of a Lyman Break Galaxy Principal Investigator: Brian Siana Institution: Spitzer Science Center Technical Contact: Brian Siana, Spitzer Science Center Co−Investigators: Harry Teplitz, Spitzer Science Center James Colbert, Spitzer Science Center David Frayer, Spitzer Science Center Science Category: high−z galaxies (z>0.5) Observing Modes: IrsMap IrsPeakupImage Hours Approved: 21.8 Abstract: A significant portion of the star−formation in the high redshift universe resides in the ultraviolet−luminous Lyman Break Galaxies (LBGs). Although they are UV bright, the bulk of their luminosities are emitted in the far−infrared (FIR). Unlike the population of luminous infrared galaxies (LIRGs and ULIRGs), LBGs are typically too faint in the MIR to for Spitzer spectroscopy. We propose deep IRS spectroscopy of the lensed Lyman−Break Galaxy (LBG) MS1512−cB58. The factor of ~30 magnification provides the only opportunity to obtain a MIR spectrum of a typical (L*) LBG. We will measure the strength of the PAH features, allowing a comparison with Lbol as measured from longer wavelength photometry. We will also fit the shape of the warm dust (VSG) continuum and compare it to expectations from the IRAC−to−MIPS70 SED. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 334/742 Spitzer Space Telescope − General Observer Proposal #40817 Harnessing High Redshift Beacons: IRS Spectra of Lensed Lyman Break Galaxies Principal Investigator: Brian Siana Institution: Spitzer Science Center Technical Contact: Brian Siana, Spitzer Science Center Co−Investigators: Ian Smail, Durham University Richard Ellis, California Institute of Technology Mark Swinbank, Durham University Harry Teplitz, Spitzer Science Center Johan Richard, California Institute of Technology Max Pettini, University of Cambridge Jean−Paul Kneib, Laboratoire d’Astrophysique de Marseiile Kristen Coppin, Durham University Harald Ebeling, University of Hawaii Alastair Edge, Durham University Science Category: high−z galaxies (z>0.5) Observing Modes: IracMap IrsMap IrsPeakupImage MipsPhot Hours Approved: 16.3 Abstract: Star−formation at high redshift occurs in two types of galaxies: dusty Ultra−Luminous Infrared Galaxies (ULIRGs) and UV−bright Lyman Break Galaxies (LBGs). In both populations dust absorbs most of the ultraviolet (UV) light from young stars and re−emits the energy in the infrared (IR). Therefore, detailed studies of the dust and the infrared SEDs of these galaxies are critical for understanding these important evolutionary stages in galaxy formation. ULIRGs at z ~ 2−3 are luminous enough for both submm detection and Spitzer IRS spectroscopy, so much has been learned recently about their interstellar medium and IR SEDs. LBGs are too faint to be detected with submm imaging or IRS spectroscopy so little can be discovered about their dust content and IR SEDs prior to JWST and ALMA. Fortunately, there exist a few rare examples of LBGs which are strongly lensed by a foreground cluster or galaxy, and are magnified by factors of 10−30. We can therefore study in detail the infrared properties of this otherwise inaccessible population. Our group will obtain (in an approved Cycle−3 program) IRS spectroscopy of the most famous LBG, cB58, but it is clearly dangerous to draw wide−ranging conclusions about the LBG population based on this single object. We therefore propose for a detailed Spitzer study of the only other known bright lensed LBGs: the "Cosmic Eye" and the "8−O’clock Arc". The requested program uses IRS spectroscopy, IRS Peak−Up 16 micron, MIPS 70 micron, and IRAC imaging to fully characterize the gas and dust in the ISM of these galaxies and determine the shape of the IR SEDs. Together, the three lensed sources span the full range of star−formation rates and dust attenuation levels observed in LBGs. Therefore, we can correlate these properties with the infrared SEDs and emission−line properties (PAHs) and apply the correlations when examining the entire LBG population. Thursday March 25, 2010 xgal_covers.txt 167/371
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Extragalactic abstracts - IRSA - California Institute of Technology

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