Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 383/742 Spitzer Space Telescope − Guaranteed Time Observer Proposal #50696 Completing MIPS imaging for the Spitzer Interacting Galaxy study Principal Investigator: Giovanni Fazio Institution: Harvard−Smithsonian Astrophysical Observatory Technical Contact: Matthew Ashby, Harvard−SAO Co−Investigators: Andreas Zezas, CfA Howard Smith, CfA Matt Ashby, CfA Tom Cox, CfA Jiasheng Huang, CfA Chris Mihos, Case Western Luigi Spinoglio, IFSI−CNR, Rome Zhong Wang, CfA Steve Willner, CfA Eduardo Gonzalez−Alfonso, Universidad de Alcala Jason Surace, IPAC Science Category: interacting/merging galaxies Observing Modes: MipsPhot Hours Approved: 2.8 Abstract: We propose to complete the MIPS coverage of a coherent set of Spitzer observations of a large representative sample of 110 nearby interacting galaxies. Galaxy interactions is a complex process that involves time−dependent scenarios affecting the evolution of all the participants. However, existing projects focus on sometimes small samples of galaxies chosen because they have the most active star formation, are bright in well−known optical emission line diagnostics, or otherwise obviously distinguished. The 110 galaxies we propose to study form a sample independent of obvious current activity; instead, it is based on physical proximity and relative velocity such that the pair is a likely candidate for interaction. We also limit the sample to relatively nearby galaxies (cz < 4000 km/sec), so that detailed spatialy resolved measurements can be obtained from the existing data. All the objects have been observed with IRAC, IRS, and all but the ones we propose have been observed with MIPS. By combining morphological, photometric and spectroscopic analyses of this sample, we will map the star−forming activity and we will study its connection with AGN activity and the interaction type and severity. This approach distinguishes itself in that it systematically traces the changes in a large sample of galaxies covering a variety of interaction types. Comparisons with simulations of galaxy interactions, will provide constraints to the theoretical models, and the influence of environmental factors (e.g. the initial gas content or the massive halos) on the final outcome of the interaction, including the energetics of a possible AGN component. Since galaxy−galaxy interactions are more ubiquitous at earlier epochs, this study should also improve our understanding of the early history of galaxy evolution. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 384/742 Spitzer Space Telescope − Guaranteed Time Observer Proposal #21 Spectroscopic Study of Star Formation in Interacting Galaxies Principal Investigator: James R. Houck Institution: Cornell University Technical Contact: Bernhard Brandl, Sterrewacht Leiden Science Category: interacting/merging galaxies Observing Modes: IracMap IrsMap IrsStare MipsPhot Hours Approved: 36.0 Abstract: The objective of our program is to study the properties of starbursts triggered by closely interacting galaxies in different states of their merging process. The properties of the starbursts may vary with location, dynamics, age, metallicity, distribution of gas and dust in the overlap region, and the presence of AGN. We will use the 4 IRS modules to measure the excitation of the gas and solid−state features in the mid−infrared spectra of a sample of 11 relatively nearby, spatially resolved interacting systems. In addition we will use IRAC and MIPS on a subset of our sample for complementary imaging. Thursday March 25, 2010 xgal_covers.txt 192/371
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 385/742 Spitzer Space Telescope − Guaranteed Time Observer Proposal #40621 Spitzer/IRS View of Very Metal−pool Mergers Principal Investigator: Jim Houck Institution: Cornell University Technical Contact: Yanling Wu, Cornell University Co−Investigators: Yanling Wu, Cornell University Simon Pustilnik, Special Astrophysical Observatory of Russian Acade Alexei Kniazev, South African Astronomical Observatory Vassilis Charmandaris, University of Crete Science Category: interacting/merging galaxies Observing Modes: IrsMap IrsStare Hours Approved: 6.2 Abstract: We propose to study the mid−IR spectra of several candidate interacting/merging dwarf galaxies with very low−metallicity. They are representatives of a small group of local objects that best approximates the properties common to high−redshift low−mass young galaxy mergers: very metal−poor, gas−rich and interacting. Groundbased observations have identified the dwarf that show morpholog and velocity profiles characteristic of larger scale mergers. We propose to approach the problem via the rotational lines of warm molecular hydrogen. We will extend previous ISO and Spitzer investigations that have shown the H2 line to be effective markers of merging activity. We will use the H2 lines as indicators of strong shocks produced by merging activity. Here, we discuss the current data set and our approach to avoiding false positive "dwarf mergers." In addition we will also use this sample to study high−ionization lines of Ne and S. We will add these new data to our ongoing study of PAH emission in low−metallicity but high−excitation environments. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 386/742 Spitzer Space Telescope − General Observer Proposal #3550 Star Formation and Galaxy Evolution During a Supersonic Cluster Merger Principal Investigator: Christine Jones Institution: Smithsonian Astrophysical Observatory Technical Contact: Christine Jones, Smithsonian Astrophysical Observatory Co−Investigators: Maxim Markevitch, SAO Anthony Gonzalez, University of Florida Michael Pahre, SAO William Forman, SAO Science Category: interacting/merging galaxies Observing Modes: IracMap Hours Approved: 2.5 Abstract: 1E0657−56 (z=0.296), one of the hottest and most luminous X−ray clusters, is the only known example of a major supersonic cluster merger. The Chandra image of this merging cluster shows a sharp bow shock that leads the merging ‘‘bullet’’ subcluster. Not only are the cluster’s X−ray properties unique, but the merger is occurring in the plane of the sky. This fortuitous geometry allows us to calculate, without model dependent geometrical assumptions, the ambient density, temperature, and pressure that the merging galaxies experience. We also know which galaxies have traversed the cluster core and, since the merger velocity is measured from the X−ray observations, the time since these galaxies traversed the core. Because the gas velocity is discontinuous at the shock, the galaxies behind it will experience one third the ram pressure exerted on galaxies ahead of the shock. Therefore, Spitzer IRAC observations of this supersonic merger will, for the first time, provide star formation rates for galaxies at a well measured time after experiencing known external pressures. In particular, we will study the effects of changing external pressure on the star formation rates of galaxies ahead, within, and directly behind the shock using the 6.2um PAH feature, redshifted into the IRAC 8.0um bandpass. Combining Spitzer observations with X−ray and ground−based images (and spectroscopy) will yield new insights into galaxy evolution during cluster mergers. Thursday March 25, 2010 xgal_covers.txt 193/371
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