Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 679/742 Spitzer Space Telescope − Guaranteed Time Observer Proposal #50586 Star Formation Rates and Metallities at z=1 Principal Investigator: George Rieke Institution: The University of Arizona Technical Contact: Jane Rigby, University of Arizona Co−Investigators: Jane Rigby, Carnegie Observatories Benjamin Weiner, Steward Observatory Delphine Marcillac, Steward Observatory Almudena Alonso−Herrero, Instituto de Estructura de la Materia, Spain Chad Engelbracht, Steward Observatory Eiichi Egami, Steward Observatory Science Category: ULIRGS/LIRGS/HLIRGS Observing Modes: IrsMap MipsPhot Hours Approved: 19.9 Abstract: We have two goals in this proposal. Deep 24 micron Spitzer surveys are widely used to study the evolution of star formation rate (SFR) with redshift. Such studies depend critically on the conversion from observed mid−IR flux density to total IR luminosity, and then to SFR. Our first goal is to test this conversion at z~1 on galaxies similar in luminosity to those that dominate the faint source counts. Our test is centered on measuring Brackett alpha line strengths in three z=1 galaxies whose fluxes have been strongly amplified by gravitational lensing. We have or will be obtaining 70 micron measurements of these same galaxies to constrain their far infrared spectral energy distributions. We will combine our sample with three unlensed, more luminous z=1 galaxies from a companion GTO proposal (50323). The two samples will test critically the IR to SFR conversions. Our second goal is to measure the metallicities for these three lensed galaxies. We already have measurements of the [Ne II] and [Ne III] lines in our LL1 spectra. By combining these results with the Br alpha and with measurements of Pa alpha, [Ne II], and [Ne III] in local LIRGs (from another of our GTO programs), we will determine the neon abundances. Neon should track the overall metallicities closely because it is synthesized in massive stars and does not deplete onto grains. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 680/742 Spitzer Space Telescope − Directors Discretionary Time Proposal #1096 Dust in ULIRG environments Principal Investigator: Henrick Spoon Institution: Cornell University Technical Contact: Henrick Spoon, Cornell University Science Category: ULIRGS/LIRGS/HLIRGS Observing Modes: IrsStare Hours Approved: 10.0 Abstract: ISO spectroscopy has revealed that the spectra of ULIRGs are not simply an ultra−luminous blend of AGN and starburst spectra. Instead, the 5−15 micron spectra show clear signs of ice and silicate absorption features, which distort their mid−infrared spectra. Especially puzzling are the ’modified’ PAH emission features seen in the ISO−CAM−CVF spectra of the more luminous and distant ULIRGs. We propose to study the effects of ice and silicate absorption on the spectra of ULIRGs from the Tran et al. ISO ("ZZ−ULIRG") sample. This sample is supplemented with less luminous galaxies, which ISO has shown to be very dusty. Our goal is to obtain full low−res spectra for the complete sample and full high−res spectra for most of them. Thursday March 25, 2010 xgal_covers.txt 340/371
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 681/742 Spitzer Space Telescope − General Observer Proposal #40244 Absorption line diagnostics of hidden star formation in ULIRGs Principal Investigator: Henrik Spoon Institution: Cornell University Technical Contact: Henrik Spoon, Cornell University Co−Investigators: Fred Lahuis, Leiden Observatory Alexander Tielens, NASA Ames Research Center Lee Armus, Caltech/SSC Marco Spaans, Groningen University Masatoshi Imanishi, National Astronomical Observatory of Japan Science Category: ULIRGS/LIRGS/HLIRGS Observing Modes: IrsStare Hours Approved: 14.9 Abstract: Ultraluminous infrared galaxies (ULIRGs) have the power output of quasars, yet emit nearly all their energy in the mid and far−infrared part of the spectrum. Over the last 10 years, much effort has focussed on identifying tracers of AGN and star formation activity in the infrared in order to quantify the origin of the infrared luminosity in these systems. Recently, we discovered the presence of warm (200−600K) dense (~10^6 cm−3) molecular gas through acetylene, hydrogen cyanide, and carbon dioxide gas−phase absorption lines in the IRS spectra of (U)LIRGs. In the Galaxy these lines are characteristic for the ’Hot Core’ phase of deeply embedded protostars. Consequently, we attribute these lines to a phase of deeply embedded star formation. While these features are most readily recognized in the spectra of highly dust enshrouded (U)LIRGs, they are also seen in ULIRGs with unambiguous evidence for an AGN. Hence, such deeply embedded star formation seems to be a general characteristic of (U)LIRG nuclei. Here we propose to use the IRS on Spitzer to search for these molecular absorption lines in a wider sample of ULIRG nuclei to determine the frequency and importance of this hitherto unrecognized phase of hidden star formation and characterize the physical conditions of the absorbing dense gas. These spectra, combined with existing high signal−to−noise observations of (U)LIRGs will allow us to place our observations of hidden star formation in ULIRGs in the context of evolution of infrared galaxies as a whole. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 682/742 Spitzer Space Telescope − General Observer Proposal #3746 A spectroscopic study of local hyperluminous infrared galaxies Principal Investigator: Aprajita Verma Institution: Max−Planck−Institut fuer extraterrestrische Physik Technical Contact: Aprajita Verma, MPE Co−Investigators: Matthias Tecza, University of Oxford Matthew Lehnert, MPE Lutz Dieter, MPE Eckhard Sturm, MPE Science Category: ULIRGS/LIRGS/HLIRGS Observing Modes: IrsStare Hours Approved: 15.4 Abstract: While IRAS revealed a plethora of ultraluminous infrared galaxies (ULIGs L_IR > 10^10 L_solar), the high luminosity component (L_IR > 10^13 L_solar) is relatively rare in number. Often selected with techniques biased towards AGN, Hyperluminous infrared galaxies (HyLIGs) are intriguing sources displaying a variety of optical spectroscopic types, and too faint for any meaningful spectroscopic investigation with instruments to date. Their colossal infrared luminosities imply a highly obscured starburst and/or AGN power source where the majority of the4 UV/optical photons are absorbed and re−radiated by dust across the infrared wavelength range. The presence of dust means the galaxy’s emission suffers extinction. This is particularly important as it implies optical spectroscopy probes only the unobscured components of these systems. With the advent of the SST, these rare sources are spectroscopically accessible for the first time at the wavelengths where they are bright and suffer from low extinction. Spectroscopic data from the Infrared Space Observatory (ISO) reveal that the mid−infrared is rich with spectral features: continuum and features from a range of dust grains residing in different phases of interstellar matter within a galaxy; subtle absorption features from silicates and water ice and hydrocarbons; and lines originating from ions, atoms and molecules. However HyLIGs were beyond the reach of ISOs sensitivity. With the Spitzer Space Telescope (SST) we may now probe into the constituent media and physical processes occurring within these luminous galaxies, for which our knowledge to date is broadly confined to coarsely sampled SEDs. Thursday March 25, 2010 xgal_covers.txt 341/371
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Extragalactic abstracts - IRSA - California Institute of Technology

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