Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 651/742 Spitzer Space Telescope − General Observer Proposal #50305 Mid−IR spectroscopy of hot and dusty, luminous high−z star forming galaxies Principal Investigator: Scott Chapman Institution: Caltech Technical Contact: Scott Chapman, Caltech Co−Investigators: Andrew Blain, Caltech Karin Menendez−Delmestre, Caltech Bruno Letarte, Caltech George Helou, SSC Ian Smail, Durham Rob Ivison, ROE, Edinburgh David Trethewey, Cambridge, IoA Mark Swinbank, Durham Science Category: ULIRGS/LIRGS/HLIRGS Observing Modes: IrsStare IrsPeakupImage Hours Approved: 53.8 Abstract: We have identified a population of high−redshift microJy radio sources which have rest−UV/optical spectra characteristic of dusty luminous starbursts, and whose radio emission implies ~1000M/yr star formation rates, but which have no detectable submm emission from cool dust. These galaxies have S(24um)=0.1−1mJy similar to submm galaxies, and typically have enormous molecular gas reservoirs (confirmed through CO3−2 detections). Resolved radio morphologies with 3kpc scale sizes completes the picture: we propose that these "optically faint radio galaxies" (OFRGs) are a new class of luminous dusty starburst with hotter dust temperatures than the similarly high−redshift ultraluminous submm galaxies. We propose Spitzer−IRS to observe the 10 confirmed star−forming OFRGs in our accepted molecular gas CO(3−2) study at the IRAM Plateau−de−Bure interferometer. We will probe the intense mid−IR emission from these galaxies for signatures of their power source, and to understand whether the aromatic features are sensitive to the more intense ionization fields in OFRGs compared with SMGs. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 652/742 Spitzer Space Telescope − General Observer Proposal #20239 MIPS 70− & 160−micron Imaging of an IRS Sample of Ultra−luminous Infrared Galaxies at z~2 Principal Investigator: Philip Choi Institution: Spitzer Science Center Technical Contact: Philip Choi, Spitzer Science Center Co−Investigators: Lin Yan, Spitzer Science Center David Frayer, Spitzer Science Center Harry Teplitz, Spitzer Science Center Lee Armus, Spitzer Science Center Anna Sajina, University of British Columbia George Helou, Spitzer Science Center Jason Surace, Spitzer Science Center Dario Fadda, Spitzer Science Center Ranga Ram Chary, Spitzer Science Center Science Category: ULIRGS/LIRGS/HLIRGS Observing Modes: MipsPhot Hours Approved: 40.4 Abstract: We propose to obtain MIPS 70− and 160−micron imaging of a mid−IR selected sample of high redshift (z~2), ultra−luminous infrared galaxies (ULIRGS). This sample was first identified in the Extragalactic First Look Survey and has since been detected with follow−up IRS spectroscopy. In addition to the IRS spectroscopy, an extensive dataset that includes IRAC, MIPS 24−micron imaging, SCUBA and MAMBO photometry and Keck spectroscopy will soon be fully assembled. The proposed addition of FIR imaging to the current dataset will allow us to 1) Directly measure the total infrared luminosity of these systems; 2) Identify the AGN vs. Starburst energetic nature of these sources based on the mid−IR emission−to−bolometric luminosity and MIR slope diagnostics; 3) Combine with SCUBA and MAMBO observations to derive total cold dust temperatures and masses; and 4) Compare this population of distant MIR−selected ULIRGs to the known SCUBA populations. Thursday March 25, 2010 xgal_covers.txt 326/371
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 653/742 Spitzer Space Telescope − Theoretical Research Proposal #50278 Polyatomic Molecule Synthesis on Dust Grain Analogues Using Superthermal Atoms Principal Investigator: Ara Chutjian Institution: Jet Propulsion Laboratory Technical Contact: Ara Chutjian, Jet Propulsion Laboratory Co−Investigators: Pascale Ehrenfreund, Leiden Institute of Chemistry John MacAskill, Jet Propulsion Laboratory Stojan Madzunkov, Jet Propulsion Laboratory Science Category: ULIRGS/LIRGS/HLIRGS Dollars Approved: 75000.0 Abstract: This proposal focuses on the physical and chemical processes catalyzed by dust grains that can lead to the formation of larger bio−forming polyatomic molecules through a new experimentally−accessible reaction channel involving fast, ground−state atoms. The fast−atom source at JPL will be used to study molecular formation with well−characterized beams of superthermal H, D, and O atoms (energies of 0.1 to 50 eV) colliding with species frozen (4.8 K) on interstellar dust grain analogues. At these atom−grain energies chemical reaction barriers are overcome and new reaction channels are opened. Simulated are conditions in prestellar cores, YSOs, circumstellar envelopes, cool dark clouds, and protoplanetary disks; from shock−heated regions to cooler and UV−shielded nebulae in the accretion phase. The results of this work will allow one to explain the presence, within these objects, of molecules such as CO2, CH3OH, and H2CO with abundances in excess of that predicted from gas−phase or thermal (closed−channel) gas−grain collisions alone. The laboratory−generated species will be compared to those detected by the Spitzer IRS. One can then correlate the superthermal−atom reactions in the laboratory to the presence of polyatomic species in those astrophysical objects that can harbor superthermal atoms. Predictions can be made, and heretofore undetected absorption/emission lines can be searched. Polyatomic formation has recently been demonstrated at JPL by creating abundant CO2 molecules via the reaction O(3P) + CO(adsorbed at 4.8 K) −−> CO2, at O(3P) energies of 2, 5, 10, and 14 eV. The CO2 was detected using temperature−programmed desorption/mass spectrometry. This is the first observation anywhere of molecule production using superthermal atoms. Methanol (CH3OH) and ethanol (CH3CH2OH) have also been synthesized in the system O+CO/CH4 (mixed ice at 4.8 K). This work will be expanded to study formation of H2CO, HCOOH (formic acid), CH3NH2 (methyl amine) and the simplest amino acid CH2NH2COOH (glycine). Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 654/742 Spitzer Space Telescope − General Observer Proposal #40640 The most extreme starbursts in the local Universe Principal Investigator: Steve Croft Institution: University of California, Davis Technical Contact: Steve Croft, University of California, Davis Co−Investigators: Wim de Vries, UC Davis Edward Laag, UC Riverside Gabriela Canalizo, UC Riverside Mark Lacy, SSC Wil van Breugel, LLNL / UC Merced Bob Becker, UC Davis Science Category: ULIRGS/LIRGS/HLIRGS Observing Modes: MipsPhot Hours Approved: 31.4 Abstract: We select galaxies with extreme star formation rates (SFR > 200 solar masses per year) in a volume−limited (0.1 < z < 0.3) sample from the Brinchmann et al. (2004) study of star−forming galaxies in the local Universe. Such galaxies are predicted to have infrared (IR) luminosities greater than 10^12 solar luminosities, and as such are the optically−selected counterparts to ultraluminous infrared galaxies (ULIRGs). We propose to obtain MIPS 24, 70 and 160 micron observations of this sample to study the luminosities, SEDs, and dust temperatures of the host galaxies, their merger companions, and other galaxies in their environs. We will look for evidence (from SEDs) of hidden "Type 2" AGN, and correlate merger fraction, merger stage (from optical images), and AGN fraction with other properties such as IR luminosity and color. Trends within the sample, as well as comparison with IR−selected ULIRGs, will shed light on the evolutionary processes linking extreme star formation, AGN fueling, and the fate of gas and dust in the mergers which are believed to lead to the formation of large elliptical galaxies. The extreme SFRs in our sample are more familiar from high−redshift systems such as sub−mm galaxies, Lyman break galaxies, and distant radio galaxies. This is an excellent opportunity to study with unprecedented detail and sensitivity the local analogs of these systems which were so important in the evolution of galaxies in the early Universe. Thursday March 25, 2010 xgal_covers.txt 327/371
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Extragalactic abstracts - IRSA - California Institute of Technology

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