Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 35/742 Spitzer Space Telescope − General Observer Proposal #20080 Infrared Spectroscopy of SN 1987A Principal Investigator: Elisha Polomski Institution: University of Minnesota Technical Contact: Elisha Polomski, University of Minnesota Co−Investigators: Diane Wooden, NASA/Ames Research Center Charles Woodward, University of Minnesota Robert Gehrz, University of Minnesota Ben Sugerman, Space Telescope Science Institute Science Category: local group galaxies Observing Modes: IrsMap IrsStare Hours Approved: 4.5 Abstract: We propose to conduct deep spectroscopic observations of SN 1987A with the IRS instrument on the Spitzer Space Telescope. Supernova 1987A in the Large Magellanic Cloud was the brightest and nearest supernova in almost 400 years and has been intensely scrutinized with both ground and space−based observatories (for a review see Arnett et al. 1989; Sugerman et al. 2005). Since its outburst the remnant has faded significantly and no infrared spectroscopy (with the exception of our Spitzer GTO observations), and only limited IR photometry has been possible since day 2000 (Bouchet et al. 2004; Wooden et al. 1993; Dwek et al. 1992). We will focus our study on determining the dust mass and mineralogy as well as the physical state and composition of the circumstellar material and the ejecta. These observations will provide insight into the abundances of heavy elements in Type II SN ejecta and the relative importance of SN for the production of dust. The spectral evolution of the SN 1987A was studied until 1990, when it became too faint for all IR instrumentation. Our observations will be an important contribution to nearly 20 years of temporal monitoring of this object. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 36/742 Spitzer Space Telescope − General Observer Proposal #3400 A Local Group Inventory of Simple Stellar Populations Principal Investigator: Michael Rich Institution: University of California − Los Angeles Technical Contact: David Reitzel, University of California, Los Angeles Co−Investigators: Flavio Fusi Pecci, INAF − Osservatorio Astronomico Bologna Livia Origlia, INAF − Osservatorio Astronomico Bologna Luciana Federici, INAF − Osservatorio Astronomico Bologna David B. Reitzel, UCLA Soo−Chang Rey, Caltech Carla Cacciari, INAF − Osservatorio Astronomico Bologna Science Category: local group galaxies Observing Modes: IracMap Hours Approved: 32.2 Abstract: Globular clusters, as aggregates of coeval stars with the same chemical abundance, are the best examples of Simple Stellar Populations and ideal templates for studying the evolution of stellar populations and for a correct interpretation of integrated colors (spectral energy distributions) of distant galaxies, with a crucial impact on cosmology. These templates, however, need to be calibrated over the widest possible wavelength range, from the far UV to the mid−IR, in order to take properly into account the contribution of all stellar components, including the coolest ones that were so far poorly known for lack of adequate observations. We propose to use Spitzer/IRAC imaging to characterize a sample of Local Group globular clusters defined to span a wide range in age and abundance. These clusters are meant to provide a grid of templates for the above purposes. Globular clusters in the LMC and SMC, chosen to span a wide range in age, will be resolved into stars. In the Fornax dwarf spheroidal galaxy, clusters are found with [Fe/H] = −2 yet with widely varying horizontal branch morphology (e.g. mass loss history). We propose also to image a set of globular clusters in M31, selected to span a wide range in abundance and different environmental conditions across the body of the galaxy. In addition to these populations, we propose to image the bulges of M31 and M32, which have been resolved into stars in the near−IR. While not strictly simple stellar populations, the bulges may give insight into similarities and differences between galaxy and globular cluster populations, and will provide an important test and verification in the application of stellar population synthesis models using the new and complete grid of templates we are proposing to assemble. Thursday March 25, 2010 xgal_covers.txt 18/371
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 37/742 Spitzer Space Telescope − Guaranteed Time Observer Proposal #30203 Extended Dust in M31: MIPS Imaging to the HI Edge Principal Investigator: George Rieke Institution: The University of Arizona Technical Contact: Karl Gordon, The University of Arizona Co−Investigators: Karl Gordon, Univ. of Arizona Charles Engelbracht, Univ. of Arizona Joannah Hinz, Univ. of Arizona Karl Misselt, Univ. of Arizona Chris Willmer, Univ. of Arizona David Thilker, Johns Hopkins Univ. Robert Braun, ASTRON, Netherlends Science Category: local group galaxies Observing Modes: MipsScan Hours Approved: 14.3 Abstract: We are proposing to extend the existing MIPS/GTO map of M31 from 1x3 degrees to approximately 1x5 degrees. The existing MIPS map covers the optical disk of M31 and clearly shows extended infrared emission to the edge of the current map along the major axis. HI observations of M31 also show that the HI disk extends well beyond the optical disk of M31, and the extended emission detected by MIPS supports an extended gas *and* dust disk of M31. The MIPS observation proposed here will complete the MIPS mapping of M31 out to the HI edge. Such observations will reveal the spatial distribution of cold dust in the extended HI disk. The spatial correlation of the MIPS emission with existing HI and GALEX ultraviolet images of M31 will probe the origin of the extended dust disk. Is it due to local star formation, fountains from inner disk star formation, interactions, or primordial infall? The answer(s) to these questions will provide insight on galaxy evolution and similar observations of more distant galaxies with MIPS. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 38/742 Spitzer Space Telescope − Guaranteed Time Observer Proposal #40591 Dissecting the IR SED of a Galaxy: Spectroscopy of Regions in M33 Principal Investigator: George Rieke Institution: University of Arizona Technical Contact: Karl Gordon, University of Arizona Co−Investigators: Karl Gordon, U. of Arizona Karl Misselt, U. of Arizona Charles Engelbracht, U. of Arizona Pauline Barmby, Harvard/CFA Science Category: local group galaxies Observing Modes: IrsMap Hours Approved: 18.5 Abstract: We propose to dissect the mid−IR SED of the Local Group galaxy M33 using IRS spectra to learn the physical properties of the different regions that contribute to the total mid−IR flux of M33. M33 is an ideal galaxy to study the relative contributions of different sources to the total flux in the disks of galaxies as it is the closest late type spiral. The IRS spectra will provide diagnostics of the excitation conditions in both the bright HII regions and the fainter diffuse regions. Although compact sources dominate our visual impression of galaxies, the diffuse regions make up over 50% of the total flux of M33 from 8 to 160 micron. A similar portion is likely to hold for other spirals: these relatively unstudied regions therefore make an major contribution to the SED and total IR power from spiral galaxies. For example, these diffuse regions also dominate the IR color−color space of M33 that was used to pick the diffuse targets for this proposal. Since the total IR power and SED colors are the most widely used parameters to characterize the integrated IR emission of galaxies, understanding of the behavior of the diffuse regions is an essential step toward improving our understanding of IR galaxies. Thursday March 25, 2010 xgal_covers.txt 19/371
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