Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 379/742 Spitzer Space Telescope − General Observer Proposal #3360 The Connection between ULXs and Infrared Star−Forming Regions in the Merging Pair of Galaxies NGC 4485/90 Principal Investigator: Edward Colbert Institution: Catholic University of America Technical Contact: Edward Colbert, Catholic University of America Co−Investigators: Ann Hornschemeier, Johns Hopkins University Timothy Roberts, University of Leicester Sangeeta Malhotra, Space Telescope Science Institute Martin Ward, University of Leicester Science Category: interacting/merging galaxies Observing Modes: IracMap IrsMap Hours Approved: 9.3 Abstract: We propose IRAC imaging of the starburst galaxy system NGC 4485/90, and pointed IRS spectral mapping for eight locations within the galaxies. NGC 4485/90 houses an extraordinarily large number of Ultra−luminous X−ray sources (ULXs), and has a dense array of HII star−forming (SF) regions. We will use IRAC images to study correlation statistics between the the six ULXs and nearby IR−luminous SF regions. The IRS spectral mapping data is to be taken for rectangular regions centered on the six ULXs, and for two comparison regions in NGC 4490. These spectra will be used to measure physical characteristics (e.g. density, excitation) of the gas in the SF regions and to diagnose properties (e.g. luminosity, hardness) of the components of the ionizing radiation. Our proposed Spitzer observations will help distinguish between competing models for ULXs, and will greatly complement on−going X−ray spectral diagnostic work, which is currently only possible for very X−ray bright ULXs. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 380/742 Spitzer Space Telescope − General Observer Proposal #3544 IRAC and MIPS Observations of the Interacting Galaxies IC 2163 and NGC 2207 Principal Investigator: Debra Elmegreen Institution: Vassar College Technical Contact: Debra Elmegreen, Vassar College Co−Investigators: Bruce Elmegreen, IBM T.J. Watson Research Center Michele Kaufman, Ohio State University Kartik Sheth, CalTech Elias Brinks, Instituto Nacional de Astrofisica Magnus Thomasson, Onsala Space Observatory Curt Struck, Iowa State University Science Category: interacting/merging galaxies Observing Modes: IracMap MipsPhot Hours Approved: 1.8 Abstract: We propose IRAC and MIPS observations of the interacting galaxies IC 2163 and NGC 2207 in order to find and measure the properties of embedded young massive clusters (YMC), determine the luminosities and masses of clusters and gas in an extraordinary region that may contain a black hole inside a YMC, measure the dust temperatures and column densities in dozens of clouds in NGC 2207 that were also observed in HI and in extinction using IC 2163 as a background source, and look for the IR counterparts of enhanced radio continuum ridges that are associated with galactic−scale tidal shocks. The results should clarify an observation that is peculiar to these galaxies and a few other sources of enhanced YMC formation relative to lower mass clusters. The data could also reveal the first evidence of mutual disk scraping in a grazing collision. As this galaxy pair is among the most thoroughly observed and modeled of all interacting (non−merger) systems, the SST observations combined with our other data and models will allow us to determine the history of tidal deformations, gas flow, and star formation over the 40 My since perigalacticon. Thursday March 25, 2010 xgal_covers.txt 190/371
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 381/742 Spitzer Space Telescope − Guaranteed Time Observer Proposal #30860 MIPS Observations of Four Infrared Bright Nearby Galaxies Principal Investigator: Giovanni Fazio Institution: Harvard−Smithsonian Astrophysical Observatory Technical Contact: Zhong Wang, Smithsonian Astrophysical Observatory Co−Investigators: Zhong Wang, Harvard−Smithsonian Center for Astrophysics Jason Surace, SSC Steve Willner, CfA Mathew Ashby, CfA Jiasheng Huang, CfA Howard Smith, CfA Mike Pahre, CfA Science Category: interacting/merging galaxies Observing Modes: MipsPhot Hours Approved: 0.3 Abstract: We propose to observe four nearby infrared lumnious galaxies with MIPS as part of our existing GTO program on Interacting/starburst galaxies. These four galaxies were omitted in earlier programs only for techincal reasons and their addition to the body of data already collected is an important final step to bring the observational part of this GTO program to completion. We already obtained high quality IRAC data of these galaxies and MIPS data would help us determine the bolometric luminosities of individual regions in them, and provide better estimates of the local star formation rate. These four galaxies sample relative late stages of the merger process and are expected to offer further clues to the final outcome of the merger process, as well as the detailed distribution of star forming activities and their potential relationship to the formation of active galactic nucleii found near the center region. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 382/742 Spitzer Space Telescope − Guaranteed Time Observer Proposal #32 Probing a Sample of Interacting and Ultraluminous Galaxies Principal Investigator: Giovanni Fazio Institution: Harvard−Smithsonian Astrophysical Observatory Technical Contact: Zhong Wang, Smithsonian Astrophysical Observatory Science Category: interacting/merging galaxies Observing Modes: IracMap MipsPhot MipsScan Hours Approved: 23.1 Abstract: Galaxies closely interacting (or merging) with each other may trigger a wide range of activities, including star formation. These could profoundly alter the course of ordinary galactic evolution. Some of these objects are spectacular nearby examples of galaxy−galaxy interactions. Others, known as ULIGs (ultraluminous infrared galaxies), are among the most luminous objects in the local universe. High sensitivity, high resolution infrared data are essential in studying these galaxies, because a majority of them are found to be rich in gas and dust, making extinction a significant limiting factor at shorter wavelengths. We propose to image a limited sample of interacting and ultraluminous galaxies with IRAC and MIPS. Our main goal is to accurately measure the amount and extent of star forming activities and to explore their relationship to the dynamics of gravitational interaction. Thursday March 25, 2010 xgal_covers.txt 191/371
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Extragalactic abstracts - IRSA - California Institute of Technology

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