Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 391/742 Spitzer Space Telescope − General Observer Proposal #20440 The Relationship of Dust Emission to the Interaction History of NGC 6876 and NGC 6872 in the Pavo Group Principal Investigator: Marie Machacek Institution: Smithsonian Astrophysical Observatory Technical Contact: Marie Machacek, Smithsonian Astrophysical Observatory Co−Investigators: Christine Jones, Smithsonian Astrophysical Observatory William R. Forman, Smithsonian Astrophysical Observatory Science Category: interacting/merging galaxies Observing Modes: IracMap Hours Approved: 0.3 Abstract: The Pavo group, with dominant elliptical galaxy NGC 6876 and large spiral galaxy NGC 6872, hosts a rich spectrum of interactions between between the galaxies and the group IGM, as evidenced by tidally distorted arms and stellar bridges in the spiral, a probable binary black hole at the nucleus of the dominant elliptical, and a hot, expansive X−ray trail between NGC 6872 and NGC 6876 caused by the high velocity motion of the large spiral through the Pavo group core. We propose to use IRAC observations in all four channels to study the dust distributions in and near NGC 6876 and NGC 6872 in the Pavo group to determine the relationship of dust to other stellar and ISM tracers of the interaction, such as X−ray, Halpha, and HI emissions. These observations will resolve ambiguities in current interaction models for the Pavo system and sharpen our understanding of the physical consequences of such interactions on the evolution of galaxy groups. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 392/742 Spitzer Space Telescope − General Observer Proposal #40118 Star Formation in the Tidal Streams of the M81 Group Principal Investigator: Susan Neff Institution: NASA Goddard Space Flight Center Technical Contact: Susan Neff, NASA Goddard Space Flight Center Co−Investigators: Zhong Wang, Smithsonian Astrophysical Observatory Min Yun, University of Massachusetts David Thilker, Johns Hopkins University Rene Walterbos, New Mexico State University Christina Chiappini, Trieste Universtiy Todd Tripp, University of Massachusetts Rob Kennicutt, Cambridge University Thomas Cox, Smithsonian Astrophysical Observatory Paul Ho, Smithsonian Astrophysical Observatory Science Category: interacting/merging galaxies Observing Modes: IracMap MipsScan Hours Approved: 67.0 Abstract: We propose to obtain sensitive wide−field MIR and FIR images of the central part of the M81 galaxy group, particularly of the tidal streams surrounding and connecting the four most massive members of the group (M81, M82, NGC3077 and NGC 2976). These observations will be compared with existing or planned observations at other wavelenths, and will be used to explore the recent star formation activity, associated radiation field, and details of the galaxy transformation processes throughout the group. We will use IRAC and MIPS to obtain images of the emission from PAHs and warm dust as well as from any old stars present in the tidal streams between the galaxies. Our observations should be sufficiently sensitive to detect star formation activity expected from a few times 10^20 cm^−2 HI column density, and will cover most of the 3degree diameter region imaged in 21cm HI. By combining the Spitzer images with our imaging data from ultraviolet (GALEX), optical/NIR (SDSS, 2MASS, Ha survey), CO (FCRAO), and HI (VLA, GBT, DRAO) surveys, we will be able to conduct an extensive, quantitative analysis of the spatial distribution of and relationships between 1) the total star formation present in the streams (both hidden and directly visible), 2) *all* of the cold gas and dust, 3) the ionizing radiation field, 4) the galaxies’ interaction history including formation of tidal dwarf galaxies, and 5) the recent star formation chronology in the streams. Spitzer data is crucial to this analysis because it provides information on obscured star formation and dust that is otherwise unavailable. The high quality of extant data, as well as dynamical models of the interactions, make the M81 group an exceptional laboratory for exploring star formation processes outside of galaxy disks. The M81 group is one of the few systems where this sort of analysis can be made with spatial resolution better than 100pc. Thursday March 25, 2010 xgal_covers.txt 196/371
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 393/742 Spitzer Space Telescope − General Observer Proposal #50454 Mid−Infrared Imaging of the Taffy Colliding Galaxy Pairs UGC 813/6 and Arp 261 Principal Investigator: Beverly Smith Institution: East Tennessee State University Technical Contact: Beverly Smith, East Tennessee State University Co−Investigators: Curt Struck, Iowa State University Mark Hancock, East Tennessee State University Mark Giroux, East Tennessee State University Jeong−Sun Hwang, Iowa State University Science Category: interacting/merging galaxies Observing Modes: IracMap MipsPhot Hours Approved: 4.0 Abstract: In Taffy galaxies, a head−on collision between two gas−rich equal−mass galaxies has occurred, stripping out a large quantity of gas from the disks, and creating a radio continuum−bright bridge between the two galaxies. To better understand the physics of dust formation, excitation, and destruction, an examination of the dust properties in these unusual systems would be useful. We propose to use Spitzer to obtain mid−infrared images of two candidate Taffy systems, UGC 813/6 and Arp 261. We will use these images to search for dust associated with the bridge, and to test for PAH destruction or dust heating by shocks during the impact. We will compare the data for these two systems with archival Spitzer data for the first Taffy galaxy discovered, UGC 12914/5. We will also compare with results from a Spitzer imaging survey of nearby interacting galaxies that we have recently completed, and with numerical simulations of the collisions between the galaxies. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 394/742 Spitzer Space Telescope − General Observer Proposal #50689 SAINTS: Star Formation and the ISM in Nearby Tidal Streams Principal Investigator: Beverly Smith Institution: East Tennessee State University Technical Contact: Beverly Smith, East Tennessee State University Co−Investigators: Sarah Higdon, Georgia Southern University Mark Hancock, East Tennessee State University James Higdon, Georgia Southern University Curt Struck, Iowa State University Science Category: interacting/merging galaxies Observing Modes: IracMap IrsStare MipsPhot Hours Approved: 30.8 Abstract: We propose to obtain high quality mid−infrared spectra of a sample of nearby tidal dwarf galaxies and tidal streams. At the present time, the properties of the interstellar matter in tidal features are not well−known. We will determine the strengths of the PAH features relative to the dust continuum, the hardness of the ISRF from the [Ne III]/[Ne II] and [S IV]/[S III] line ratios, the quantity of warm molecular gas from the H2 lines, as well as the neon and sulfur abundances. We will compare these quantities to those of normal dwarf and spiral galaxies. We have already acquired considerable data for most of our sample, including Spitzer broadband images, GALEX UV images, optical images, and HI maps. Tidal features may contribute significantly to the intergalactic medium, and some may evolve into independent galaxies. Since interactions are more common at high redshift, studying nearby examples are important for interpreting the results of high redshift surveys. Thursday March 25, 2010 xgal_covers.txt 197/371
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Extragalactic abstracts - IRSA - California Institute of Technology

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