Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 3/742 Spitzer Space Telescope − General Observer Proposal #30491 A Complete Picture of the Dust in the Small Magellanic Cloud: Following up Spitzer Imaging with Spectroscopic Observations Principal Investigator: Alberto Bolatto Institution: University of California at Berkeley Technical Contact: Alberto Bolatto, University of California at Berkeley Co−Investigators: Snezana Stanimirovic, U.C. Berkeley Karin Sandstrom, U.C. Berkeley Joshua Simon, Caltech J.D. Smith, U. of Arizona James Ingalls, IPAC Bruce Draine, Princeton University Aigen Li, University of Missouri−Columbia Frank Israel, University of Leiden Francois Boulanger, Institute d’Astrophysique Spatiale James Jackson, Boston University Jacco van Loon, Keele University Monica Rubio, Universidad Nacional de Chile Adam Leroy, U.C. Berkeley Ronak Shah, Boston University Caroline Bot, IPAC Science Category: local group galaxies Observing Modes: IrsMap IrsStare Hours Approved: 105.6 Abstract: We request Spitzer Space Telescope time to obtain wide−field spectroscopic maps of several regions in the Small Magellanic Cloud. This survey is complementary to the imaging information obtained by the Spitzer survey of the SMC (S3MC), and it is designed to sample a variety of environments. We will use these data to unravel the life−cycle, distribution, abundance, and composition of PAHs and dust throughout the SMC, linking spectral variations to the measured IRAC/MIPS SEDs. IRS spectroscopy will allow us to relate variations in PAH and dust chemistry and excitation (such as size, structure, hydrogenation, and ionization state) to the physical conditions and astrophysical processes present in the mapped regions. This study will provide strong constraints on theoretical dust models, in addition to producing information on the abundance, life cycle, and evolution of PAHs and VSGs. Ultimately, this research will help constrain the properties of the ISM in primordial galaxies at high redshifts.This project takes advantage of the uniquely new ability of Spitzer, which is capable of obtaining sensitive spectral maps covering large areas with a modest investment of time. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 4/742 Spitzer Space Telescope − General Observer Proposal #3316 The Small Magellanic Cloud: A Template for the Primitive Interstellar Medium Principal Investigator: Alberto Bolatto Institution: University of California at Berkeley Technical Contact: Alberto Bolatto, University of California at Berkeley Co−Investigators: Snezana Stanimirovic, University of California at Berkeley Frank Israel, Leiden Observatory James Jackson, Boston University Adam Leroy, University of California at Berkeley Aigen Li, University of Arizona Ronak Shah, Boston University Joshua Simon, University of California at Berkeley Lister Staveley−Smith, Australia Telescope/CSIRO Science Category: local group galaxies Observing Modes: IracMap MipsScan Hours Approved: 48.8 Abstract: The Small Magellanic Cloud constitutes an excellent laboratory to study the properties of the dust in a low metallicity environment. We propose to obtain images of the entire SMC in all IRAC and MIPS wavebands, a feat only possible because of Spitzer’s unparalleled sensitivity. With these observations we will quantify the distribution and properties of very small grains and PAHs throughout the SMC in relation to their environment. These data will allow us to constrain theoretical dust models, and provide information on the abundance, distribution, ionization state, composition, and evolution of PAHs and VSGs. MIPS observations will probe the distribution of small and large dust grains, and in combination with ground−based observations, will be used to provide an independent estimate of the amount of molecular gas in the SMC. Ultimately, this research will help constrain the properties of the ISM in primordial galaxies at high redshifts. The SMC images will be publicly released within 6 months of the last observations, for the benefit of the entire astronomical community and to allow other groups to perform follow−up observations. Thursday March 25, 2010 xgal_covers.txt 2/371
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 5/742 Spitzer Space Telescope − General Observer Proposal #3680 Ejecta and Interstellar Dust in Magellanic Clouds Supernova Remnants Principal Investigator: Kazimierz Borkowski Institution: North Carolina State University Technical Contact: Kazimierz Borkowski, North Carolina State University Co−Investigators: William Blair, Johns Hopkins University Parviz Ghavamian, Johns Hopkins University Sean Hendrick, North Carolina State University Knox Long, Space Science Telescope Institute John Raymond, Harvard University Stephen Reynolds, North Carolina State University Ravi Sankrit, Johns Hopkins University Chris Smith, National Optical Astronomy Observatory Frank Winkler, Middlebury College Science Category: local group galaxies Observing Modes: IracMap MipsPhot Hours Approved: 21.4 Abstract: Stellar explosions govern the interstellar dust lifecycle. In the early Universe, supernovae (SN) injected the first heavy elements into the interstellar medium (ISM). A significant fraction of ejecta was dust. Dust is destroyed today in supernova remnant’s (SNR) blast waves. Our current understanding of both formation of dust in SNe and destruction of dust in blast waves is poorly understood. We propose to observe a complete sample of SNRs in Magellanic Clouds (MCs) with the Spitzer Space Telescope (SST) in order to dramatically advance our knowledge of these processes. Heavy−element ejecta have been detected in more than one third of all SNRs in MCs, mostly in X−rays. Dust within these ejecta is collisionally heated by electrons and ions, and reradiates the absorbed energy in the far−IR. We propose deep MIPS and IRAC imaging of all MC SNRs with heavy−element ejecta in order to detect and study ejecta dust. We will determine dust temperature, dust mass, and its spatial distribution within ejecta. We will also detect dust in the ISM swept by SNR blast waves. This dust is destroyed by sputtering in hot X−ray emitting plasmas. We will learn about dust destruction by measuring the dust/gas mass ratio behind blast waves through a combined IR−X−ray analysis. Sputtering preferentially destroys small dust grains, modifying the grain size distribution. This strongly affects thermal dust emission in the IRAC bands which is produced by small grains. We will learn about the destruction of small grains by observing spatial variations of IRAC band ratios behind blast waves. An unbiased survey of all SNRs in MCs is necessary for understanding of dust destruction. We propose 24 micron MIPS imaging of all MC SNRs, and 70 micron MIPS imaging of X−ray bright SNRs. The proposed MIPS and IRAC imaging of MC SNRs will provide us with unique information about ejecta dust in a large sample of SNRs and about destruction of the ISM dust. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 6/742 Spitzer Space Telescope − Archive Research Proposal #40568 Star Clusters in M31: Stellar Populations and Mass Loss Principal Investigator: Jean Brodie Institution: University of California, Santa Cruz Technical Contact: Jean Brodie, University of California, Santa Cruz Co−Investigators: Jay Strader, University of California, Santa Cruz Jacco van Loon, Keele University Science Category: local group galaxies Dollars Approved: 48294.0 Abstract: We propose an imaging study of massive star clusters in M31 using archival Spitzer imaging with IRAC and MIPS. We have two distinct goals: (1) Estimate cluster ages, metallicities, and reddenings through panchromatic FUV to mid−IR imaging, and (2) Assess the production rate and lifetime of dust in the intracluster medium (ICM) as a function of cluster properties. Our results will give important constraints on the star formation history of M31 and on mass loss in stellar clusters. Thursday March 25, 2010 xgal_covers.txt 3/371
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