Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 15/742 Spitzer Space Telescope − Guaranteed Time Observer Proposal #3 Brown Dwarf Galaxy Haloes Principal Investigator: Giovanni Fazio Institution: Harvard−Smithsonian Astrophysical Observatory Technical Contact: Matthew Ashby, Harvard−SAO Science Category: local group galaxies Observing Modes: IracMap Hours Approved: 32.4 Abstract: The form of matter in galaxy haloes inferred from dynamical studies (i.e., rotation curves) remains unknown. We propose to image four bright local edge−on spiral galaxies with IRAC to detect these haloes and (if possible) characterize the distribution of halo mass. IRAC observations will be at least an order of magnitude more sensitive than previous attempts to measure flux from galaxy haloes. Combining images from all four IRAC bands also provides a potential means of discriminating among possible constituents of the dark matter. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 16/742 Spitzer Space Telescope − Guaranteed Time Observer Proposal #40032 Mysterious PAHs in M31 Principal Investigator: Giovanni Fazio Institution: Smithsonian Astrophysical Observatory Technical Contact: Pauline Barmby, Smithsonian Astrophysical Observatory Co−Investigators: Pauline Barmby, SAO Steven Willner, SAO Howard Smith, SAO Matthew Ashby, SAO Karl Gordon, University of Arizona Els Peeters, University of Western Ontario/SETI Inst. Nick Devereux, Embry−Riddle Aeronautical University David Thilker, Johns Hopkins University Science Category: local group galaxies Observing Modes: IrsMap Hours Approved: 13.0 Abstract: Spitzer/IRS observations are the ideal tool to investigate puzzling ISO results on the spectra of PAHs in M31. The SINGS Legacy project has convincingly demonstrated that the 6−8um PAH bands dominate the mid−IR spectrum of star−forming galaxies, carrying a significant fraction of the total infrared luminosity. But ISOCAM spectro−imaging observations of M31 showed that the nucleus and bulge of this galaxy had very odd PAH spectra, bright at 11.3um and 12.7 microns but lacking the usual 6.2, 7.7 and 8.6 micron bands. The IRAC images clearly show that there is non−stellar emission in the 8 micron band in both the bulge and nucleus, as well as in the star−forming ring where the ISO spectra were more "normal". It has been suggested that the unusual ISO spectra are due to neutral (as opposed to the usual ionized) PAHs in regions with weak UV fields, possibly due to the presence of an AGN. We propose to map 11 regions in M31 with IRS spectral maps covering the wavelength range 5−20 microns (SL+LL2). The regions to be mapped include the nucleus, two regions observed by ISOCAM, and 9 other regions chosen for a range of dust temperatures, UV intensities and metallicities. We will measure the variation in relative strength of the PAH bands and its dependence on environment. M31 offers a unique laboratory for mapping PAH variations within a well−studied galaxy, furthering our understanding of these astrophysically important bands. Thursday March 25, 2010 xgal_covers.txt 8/371
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 17/742 Spitzer Space Telescope − Guaranteed Time Observer Proposal #50474 Mysterious Ionized Nuclear Spirals in M31 and M81 Principal Investigator: Giovanni Fazio Institution: Harvard−Smithsonian Astrophysical Observatory Technical Contact: Steven Willner, Center for Astrophysics Co−Investigators: Matthew Ashby, Harvard−Smithsonian Center for Astrophysics Pauline Barmby, University of Western Ontario Nick Devereux, Embry−Riddle Aeronautical University Howard Smith, Harvard−Smithsonian Center for Astrophysics Science Category: local group galaxies Observing Modes: IrsMap IrsPeakupImage Hours Approved: 9.0 Abstract: Despite decades of study, M31 and M81 remain enigmatic galaxies. Both harbor large (~ 1kpc), and luminous, H−alpha emission line spirals, the origin and excitation of which remains poorly understood. None of the usual sources of ionization, such as massive stars for example, can account for the observed H−alpha line emission. Evidently, there is some unconventional source of ionization present in the central region of M31 and M81 that could be present in other galaxies and other active galactic nuclei. However ubiquitous, this phenomenon can only be studied in very nearby galaxies like M31 and M81 where we can acquire observations with high angular resolution and sensitivity. We propose to use the Infrared Array Spectrometer aboard the Spitzer Space Telescope to obtain mid−infrared spectroscopic observations of the emission line spirals in M31 and M81. Specifically, we propose to sample the spatial distribution of [NeII] and [NeIII] line emission, as these lines will enable us to determine the spatial extent and the spectral shape of the ionizing radiation field that is responsible for exciting the emission line gas. The observations will allow us to distinguish between viable candidates for the ionization as diverse as hot, billion year old post AGB stars, mechanical shocks and hot x−ray gas. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 18/742 Spitzer Space Telescope − Legacy General Observer Proposal #40245 SAGE−SMC: Surveying the Agents of Galaxy Evolution in the Tidally−Disrupted, Low−Metallicity Small Magellanic Cloud Principal Investigator: Karl Gordon Institution: University of Arizona Technical Contact: Karl Gordon, University of Arizona Co−Investigators: Margaret Meixner (ES, SF, ISM, archive), STScI Robert Blum (ES), NOAO William Reach (ISM, SF, IRAC), IPAC/Caltech Barbara Whitney (SF, IRAC), Space Science Institute Jason Harris (SF), U. of Arizona Remy Indebetouw (SF, ISM, IRAC), U. of Virginia Alberto Bolatto (SF, ISM), U. of California−Berkeley Jean−Philippe Bernard (ISM, SF), Centre d’Etude Spatiale des Rayonnements Marta Sewilo (SF), U. of Wisconsin, Madison Brian Babler (IRAC), U. of Wisconsin−Madison Miwa Block (MIPS), U. of Arizona Caroline Bot (ISM, SF), Caltech/IPAC Steve Bracker (IRAC, SF), Univ. of Wisconsin−Madison Lynn Carlson (SF), Johns Hopkins Ed Churchwell (SF, IRAC), U. of Wisconsin−Madison Geoffrey Clayton (ISM, ES), Louisiana State University Martin Cohen (ISM, ES, Cal), UC Berkeley/RAL Charles Engelbracht (ISM, SF, MIPS), U. of Arizona Yasuo Fukui (ISM, SF), Nagoya University Varoujan Gorjian (SF), JPL/Caltech Sacha Hony (ISM, SF), CEA Saclay Joseph Hora (SF, ISM, IRAC), Harvard−Smithsonian CFA Frank Israel (ISM, SF), Leiden University Akiko Kawamura (SF, ISM), Nagoya University Adam Leroy (ISM, SF), MPIA Aigen Li (ISM, SF, ES), Univ. of Missouri−Columbia Suzanne Madden (ISM, SF), CEA Saclay Ciska Markwick−Kemper (ES), U. of Manchester Marilyn Meade (IRAC), U. of Wisconsin−Madison Karl Misselt (ISM, SF, MIPS), U. of Arizona Akira Mizuno (ISM, SF), Nagoya University Norikazu Mizuno (ISM, SF), Nagoya University Erik Muller (ISM, SF), CSIRO Joana Oliveira (SF), U. of Keele Knut Olsen (ES), CTIO/NOAO Toshikazu Onishi (SF, ISM), Nagoya University Roberta Paladini (SF, ISM), Caltech/IPAC Sean Points (ES, ISM), CTIO/NOAO Thomas Robitaille (SF), University of St Andrew Douglas Rubin (ISM), Wesleyan University Karin Sandstrom (ISM, SF), U. of California, Berkeley Shuji Sato (SF), Nagoya University Hiroshi Shibai (ISM, SF), Nagoya University Josh Simon (SF, ISM), Caltech Linda Smith (ISM, SF, ES), STScI/ESA Sundar Srinivasan (ES), Johns Hopkins/STScI Xander Tielens (ISM, SF, ES), NASA Ames Uma Vijh (ISM, SF, ES, archive), STScI Schuyler Van Dyk (ES, ISM), IPAC/Caltech Jacco Van Loon (ISM, SF, ES), U. of Keele Kevin Volk (ES), Gemini Dennis Zaritsky (SF), U. of Arizona Science Category: local group galaxies Observing Modes: IracMap MipsScan Hours Approved: 285.0 Thursday March 25, 2010 xgal_covers.txt 9/371
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Extragalactic abstracts - IRSA - California Institute of Technology

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