Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 375/742 Spitzer Space Telescope − General Observer Proposal #20369 Spitzer Imaging and Spectroscopy of Collisional Ring Galaxies Principal Investigator: Philip Appleton Institution: Caltech Technical Contact: Philip Appleton, Caltech Co−Investigators: Lee Armus, SSC−Caltech Joseph Mazzarella, IPAC−Caltech Barry Madore, Carnegie Observatories (OCIW) Curtis Struck, Iowa State University Seppo Laine, SSC−Caltech Thomas Jarrett, SSC−Caltech Beverly Smith, East Tennessee State University Armando Gil de Paz, Carnegie Observatory (OCIW) William Reach, SSC−Caltech Vassilis Charmandaris, Cornell University Steven Lord, HSC−Caltech Kirk Borne, George Mason University Science Category: interacting/merging galaxies Observing Modes: IracMap IrsMap IrsStare MipsPhot Hours Approved: 12.0 Abstract: We propose Spitzer imaging and IRS spectroscopy of a sample of twelve collisional ring galaxies. These galaxies exhibit radially−expanding massive− star forming rings which are believed to be the gravitational response of the target disk to a head−on collision of a companion through its center. Among the most luminous kinds of galaxy found by GALEX in the UV, these collisional systems are particularly suitable for studying interstellar dust under a wide variety of excitation conditions and metallicities. Spitzer imaging and MIR−spectroscopy, in combination with a large body of ancillary data and models, will allow us to: 1) determine the SEDs of massive star formation knots around the rings from the UV to the far−IR, and 2) investigate how the properties of dominant dust grain populations vary with the large range of conditions seen in the rings, 3) investigate how the strength of PAH−−features varies with metallicity, and 4) search for (dust enshrouded) secondary star formation sites inside the rings predicted to be triggered by the collapse of molecular clouds in the wake of the ring passage. Understanding the response of dust grains to a wide range of excitation conditions in collisional systems will contribute to our understanding of the rest−frame mid−IR properties of high redshift galaxies seen in deep Spitzer surveys. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 376/742 Spitzer Space Telescope − General Observer Proposal #50764 The Search for Powerful Molecular Hydrogen Emission in Hickson Compact Groups Principal Investigator: Philip Appleton Institution: Caltech Technical Contact: Philip Appleton, Caltech Co−Investigators: Patrick Ogle, SSC−caltech Robert Antonucci, UC Santa Babara Francois Boulanger, IAS Paris Vassilis Charmandaris, U. of Crete Eiichi Egami, U. of Arizona Pierre Guillard, IAS Paris Emeric Le Floc’h, IfA hawaii Lourdes verdes−Montenegro, IdAA Min Yun, UMASS Science Category: interacting/merging galaxies Observing Modes: IracMap IrsMap IrsStare MipsPhot Hours Approved: 48.1 Abstract: We propose to search for powerful molecular hydrogen emission in 29 Hickson Compact Groups of galaxies. The proposal is the first systematic attempt to understand the new class of H2−powerful galaxies, called MOHEGs, which have recently been discovered by Spitzer. These galaxies are characterized as having huge luminosities emitted in the pure−rotational lines of H2 in the MID−IR, and are very likely shock excited. This proposal targets the very environments in which MOHEGs have been discovered, and will for the first time attempt to understand the conditions that lead to this activity. The results will have lasting value for IR astronomy, providing a starting point for similar searches of H2 bright galaxies at high−z with the next generation of IR telescopes. Thursday March 25, 2010 xgal_covers.txt 188/371
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 377/742 Spitzer Space Telescope − General Observer Proposal #20193 IRS Spectral Mapping of Major Mergers Principal Investigator: Lee Armus Institution: Spitzer Science Center Technical Contact: Lee Armus, Spitzer Science Center Co−Investigators: J.D. Smith, University of Arizona Vassilis Charmandaris, University of Crete John Hibbard, NRAO Min Yun, University of Massachusetts Berhard Brandl, University of Leiden Jason Surace, SSC Seppo Laine, SSC Francois Schweizer, OCIW Tom Jarrett, IPAC Aaron Evans, SUNY Stony Brook Science Category: interacting/merging galaxies Observing Modes: IrsMap Hours Approved: 44.9 Abstract: Interactions and mergers are important drivers of galaxy evolution. Minor mergers can puff−up galactic disks, produce bars and rings, and facilitate on−going star−formation through delivery of fresh fuel to the parent galaxy. Major mergers, those between more or less equal mass galaxies, can completely disrupt the stellar and gaseous morphologies of both systems, transform spirals into massive ellipticals, and fuel both powerful starbursts and massive nuclear black holes. At high redshifts, mergers are responsible for the rapid rise in the number counts seen in deep imaging surveys, and the genesis of some of the most luminous galaxies observed. We propose to use the IRS on Spitzer in spectral mapping mode to study both the morphology and the spectral properties of the gas and dust in a sample of eight nearby, IR bright merging galaxies that span the range from early (NGC 4676, NGC 6621, and NGC 7592) to mid (NGC 2623, NGC 520 and NGC 6240) to late (NGC 3921 and NGC 7252) major mergers. With these data we will be able to measure the spatial variations and evolution in the hot and warm dust, search for buried AGN, and directly couple the dust and ionized gas properties, even in regions that are complete opaque in the optical. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 378/742 Spitzer Space Telescope − General Observer Proposal #50172 Spectroscopy of IR Galaxies Over The Merger Sequence Principal Investigator: Carrie Bridge Institution: Spitzer Science Center Technical Contact: Carrie Bridge, Spitzer Science Center Co−Investigators: Harry Teplitz, Spitzer Science Center Lee Armus, Spitzer Science Center Raymond Carlberg, University of Toronto Chris Conselice, Univeristy of Nottingham Phil Appleton, Spitzer Science Center Science Category: interacting/merging galaxies Observing Modes: IrsStare Hours Approved: 32.4 Abstract: Locally, ~50% of LIRGs and 95% of ULIRGs are driven by galaxy mergers, which provide the primary means of triggering star formation and AGN activity. However, at z>0.7 the dominate mechanisms responsible for the IR emission in LIRG galaxies may be different from those locally, as only 30% of z=0.7 LIRGs exhibit merger signatures and the remaining 70% appear to be undisturbed spiral galaxies. Although the merger process itself is the same at both high and low redshift, the galaxies involved in the mergers are not. At higher redshift, galaxies have higher gas mass fractions, meaning more fuel for star formation and AGN, can have smaller bulges, and are less likely to have bar structures. These differences can affect the onset, strength and relative contribution to their IR luminosity from starbursts and AGN. Using the CFHTLS−Deep Catalog of Interacting Galaxies we have identified 24 (>1mJy at 24um) early to late stage IR bright mergers, between 0.45
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Extragalactic abstracts - IRSA - California Institute of Technology

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