Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 723/742 Spitzer Space Telescope − Archive Research Proposal #20407 Gas, Dust, and Star Formation in Wolf−Rayet Galaxies Principal Investigator: Roy Gal Institution: University of California, Davis Technical Contact: Roy Gal, University of California, Davis Co−Investigators: Iranderly Fernandes, Instituto Nacional de Pesquisas Espaciais, Divisao Aurea Garcia−Rissmann, Laboratorio Nacional de Astrofisica/MCT Reinaldo de Carvalho, Instituto Nacional de Pesquisas Espaciais, Divisao Science Category: starburst galaxies Dollars Approved: 66835.0 Abstract: Starbursts, and particularly Wolf−Rayet galaxies, are objects with violent star formation that cannot be maintained for a Hubble time. They provide important clues to understanding galaxy formation and evolution mechanisms, since massive stars play an important role in the nucleosynthesis of heavier elements and the transfer of mechanical energy to the interstellar medium. Understanding how gas collapses to generate bursts of star formation in galaxies, and how star cluster evolution occurs to form the relation between central black hole mass and galaxy bulge properties is one of the key subjects in modern astrophysics. We propose to use existing high− and low− resolution IRS observations to investigate the gas properties and stellar populations of a sample of local Wolf Rayet galaxies, using mid−infrared diagnostic diagrams. The mid−IR has the advantage of not being subject to the huge extinction that affects UV and optical observations, especially in objects with strong star formation where the young clusters are embedded in a thick dust shorud. We will probe the star formation/AGN processes in these environments through the analysis of fine structure line ratios, PAH emission and the derivation of photo−ionization parameters. These results will be compared with those derived from spectra available in the SDSS database and targeted long−slit observations, revealing the limitations of traditional shorter wavelength observations. Realistic photoionization models will be used to analyze a broad range of physical parameters and peculiarities of the observed regions. Correlations between the massive stellar spectral signatures and gas abundance, or gas excitation, will enable estimation of the number of such stars in the observed regions. The heterogeneous character of the sample, including active and non−active galaxies, will allow us to test evolutionary scenarios proposed for AGN, an important test for the Unified Model of AGN. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 724/742 Spitzer Space Telescope − General Observer Proposal #20390 Star Formation and Dust in Nearby Lyman Break Galaxy Analogs Discovered by GALEX Principal Investigator: Charles Hoopes Institution: Johns Hopkins University Technical Contact: Charles Hoopes, Johns Hopkins University Co−Investigators: Timothy Heckman, Johns Hopkins University David Schminovich, Columbia University Stephane Charlot, Max−Plank−Institut fur Astrophysik Guinevere Kauffmann, Max−Plank−Institut fur Astrophysik D. Christopher Martin, California Institute of Technology R. Michael Rich, University of California at Los Angeles Samir Salim, University of California at Los Angeles Mark Seibert, California Institute of Technology Science Category: starburst galaxies Observing Modes: IracMap MipsPhot Hours Approved: 15.8 Abstract: We have used the ultraviolet all−sky imaging survey currently being conducted by the Galaxy Evolution Explorer (GALEX) to identify for the first time a rare population of low−redshift starbursts with properties remarkably similar to high−redshift Lyman Break Galaxies. These compact UV−luminous galaxies (UVLGs) resemble Lyman Break Galaxies in terms of size, UV luminosity, surface brightness, mass, metallicity, kinematics, and color. They have characteristic "ages" (stellar mass/SFR) of only a few hundred Myr. This population of galaxies is thus worthy of study in its own right and as a sample of local analogs of Lyman Break Galaxies. We propose to obtain far−infrared and mid−infrared fluxes for a sample of the 31 nearest and brightest compact UVLGs using MIPS and IRAC. With these data we will 1) determine the total star formation rate using the far−IR+UV luminosity, 2) probe the dust content and the relation between UV reddening and IR flux in these galaxies, 3) explore the relationship between PAH emission features and star−formation rates in the extreme environment of UVLGs, 4) construct the IR to UV SED and compare with extensive spectral evolution models to determine the star formation history and total stellar mass, and 5) calibrate techniques to study the properties of high−redshift Lyman Break Galaxies. These data will provide important information on star formation in the present−day universe, and will shed new light on the earliest major episodes of star formation in high−redshift galaxies. Thursday March 25, 2010 xgal_covers.txt 362/371
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 725/742 Spitzer Space Telescope − Guaranteed Time Observer Proposal #30680 A Complete IRS Sample of PAH−rich Star Forming Dwarves in the SWIRE ELAIS N1 Field Principal Investigator: James R. Houck Institution: Cornell University Technical Contact: Sarah Higdon, Cornell University Co−Investigators: James Higdon, Cornell University Duncan Farrah, Cornell University Carol Lonsdale, UCSD Jason Marshall, Cornell University Thomas Nikola, Cornell University Gordon Stacey, Cornell University Science Category: starburst galaxies Observing Modes: IrsStare Hours Approved: 6.6 Abstract: Understanding galaxy formation is at the foundation of extragalactic astronomy. Galaxies are thought to be assembled via mergers of small dwarf−like systems at high redshift. One of the best ways of providing observational constraints to the models is through a better understanding of local examples of these "building blocks", star forming dwarf galaxies. We have exploited the SWIRE legacy database to perform an unbiased search for extreme star forming PAH−rich dwarf galaxies. We wish to observe a complete and flux−limited 8 um selected sample of 27 PAH−rich dwarf galaxies in the ELAIS N1 field with the Infrared Spectrograph. This proposal is part of a much larger study of the PAH−rich dwarf galaxy population. However, the Spitzer observations are critical for our project as this is a mid−infrared selected sample and we need to compare the mid−infrared properties with Spitzer surveys of known galaxy type. Only Spitzer enables us to measure the PAH features; directly observe the low−J rotational molecular hydrogen lines; and the fine structure lines in a practically extinction−free wavelength range. These observations will characterize the physical properties of the star−forming regions, e.g., star formation rate, excitation, electron density, warm molecular gas mass. Please note that this is a COMPLETE SURVEY OF 27 PAH−RICH DWARVES. The SPITZER TIME request is SPLIT between this GTO proposal (SJH_PDGT), which has my total GTO time allocation of 6.6 hrs for 4 sources AND a GO proposal (SJH_PDGO) to observe the remaining 23 SOURCES in 37.9 hrs. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 726/742 Spitzer Space Telescope − Guaranteed Time Observer Proposal #40038 Infrared Spectra of a Complete Bright Galaxy Sample Defined by Spitzer Principal Investigator: James Houck Institution: Cornell University Technical Contact: Daniel Weedman, Cornell University Co−Investigators: Emeric Le Floc’h, University of Hawaii Kate Brand, Space Telescope Science Institute Science Category: starburst galaxies Observing Modes: IrsStare Hours Approved: 23.6 Abstract: A complete, flux−limited sample needing IRS low−resolution observations has been defined for 121 sources chosen from the IRS GTO Bootes Survey and from the Spitzer First Look Survey. Samples are defined to 10 mJy and to 6 mJy at 24u. We have already obtained spectra for 26 galaxies having 24u fluxes > 10 mJy, and GO observations exist for 13 sources in the total sample of 121. Of these 26 sources, 15 show strong PAH emission features characteristic of starbursts, 3 show deep silicate absorption features, and 8 show AGN emission lines or featureless infrared spectra. Redshifts range from 0.017 to 2.41, and continuum luminosities at rest−frame 6u have 2x10^{41} ergs per s < vLv(6u) < 6.3x10^{46} ergs per s., indicating that such a sample covers the full range of infrared−luminous populations of extragalactic sources. New IRS GTO observations are proposed for 33 sources for a total of 23.6h GTO time. These GTO sources will complete the 10 mJy sample for both Bootes and the FLS and initiate a 6 mJy Bootes sample with 12 sources. A companion GO proposal for the remaining 49 sources in the 6 mJy Bootes sample will complete that sample. The proposed GTO and GO observations will assemble enough sources to study unbiased luminosity functions and evolution for infrared−luminous galaxies of various types. Thursday March 25, 2010 xgal_covers.txt 363/371
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Extragalactic abstracts - IRSA - California Institute of Technology

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