Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 727/742 Spitzer Space Telescope − Guaranteed Time Observer Proposal #40050 Abundance gradients in NGC 6052 Principal Investigator: Jim Houck Institution: Cornell University Technical Contact: Daniel Devost, Cornell University Co−Investigators: Bernhard Brandl, Leiden University David Whelan, Cornell University Vianney Lebouteiller, Cornell University Jeronimo Bernard−Salas, Cornell University Shannon Guiles, Cornell University Science Category: starburst galaxies Observing Modes: IrsMap Hours Approved: 4.8 Abstract: There are hints in IRS low resolution data of NGC 6052 (Whelan et al. 2007) of the presence of a metallicity gradient. We propose here to investigate this in more detail by observing this galaxy for 5 hours using the SH module in mapping mode. If confirmed, this gradient would be the first one detected inside a dwarf star forming system other than the LMC. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 728/742 Spitzer Space Telescope − Guaranteed Time Observer Proposal #40101 Dust properties in the extremely metal−poor BCD: IZw18 − from IRS mapping Principal Investigator: Jim Houck Institution: Cornell University Technical Contact: Yanling Wu, Cornell University Co−Investigators: Yanling Wu, Cornell University Vassilis Charmandaris, University of Crete Leslie Hunt, INAF Jeronimo Bernard−Salas, Cornell University Vianney Lebouteiller, Cornell University Science Category: starburst galaxies Observing Modes: IrsMap IrsPeakupImage IrsStare Hours Approved: 8.4 Abstract: We propose to use the short−low and short−high modules of the IRS to map the extremely low−metallcity blue compact dwarf galaxy, IZw18. Having just 1/30th the solar metallicity, IZw18 has been studied extensively at nearly all wavelengths and has been considered a local analogue to the formation of primordial galaxies in the early universe. We aim at obtaining deep mid−IR spectra of the NW and SE clusters of the galaxy, which are known to display a variation in their broadband infrared colors, and use those spectra to study the physics of dust and radiation field in the galaxy. How different are the spectral slopes in these regions and what causes this difference? Are the metallicities derived from the infrared for these two regions also different and how do they compare to the optical? We will be able to answer these questions with the new proposed observation. Thursday March 25, 2010 xgal_covers.txt 364/371
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 729/742 Spitzer Space Telescope − Guaranteed Time Observer Proposal #73 IRS and MIPS observations of Starburst galaxies Principal Investigator: James R. Houck Institution: Cornell University Technical Contact: Daniel Devost, Cornell University Science Category: starburst galaxies Observing Modes: IrsMap Hours Approved: 12.2 Abstract: The observational properties of starburst galaxies are dominated by the light emitted by their young stellar population. Many starburst galaxies have high FIR fluxes which are the direct product of heating by the hot stars and re−emission in the 60−100 microns part of the spectrum. Starburst galaxies thus form an ideal laboratory to study star formation and its relationship to the physical properties of a galaxy and it’s ISM. A sample of 7 starburst galaxies for which physical properties have been derived from optical spectroscopy will be observed with IRS and MIPS. First, observations at 24 microns with MIPS imaging are planned to estimate fluxes and source position for IRS spectroscopy. Then, low resolution IRS observations will allow studies of the dust, PAH and PDR properties while high resolution spectroscopy will be performed on two bright unresolved sources to study high excitation lines. MIPS imaging at 160 microns is also planned to allow the deepest probing possible of the dust. The properties derived with these observations will be compared with the physical properties derived from the optical observations. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 730/742 Spitzer Space Telescope − Archive Research Proposal #30844 The Formation and Early Evolution of Star Clusters Principal Investigator: Kelsey Johnson Institution: University of Virginia Technical Contact: Kelsey Johnson, University of Virginia Co−Investigators: Amy Reines, University of Virginia William Vacca, NASA−Ames Andrea Gilbert, IGPP/LLNL Science Category: starburst galaxies Dollars Approved: 75460.0 Abstract: Super star clusters are one of the most extreme star forming environments in the universe, and an important mode of star formation during the cataclysmic events of galaxy merging and assembly. These clusters are also important agents of galactic evolution in the local universe, and can have violently disruptive effects on their host galaxies. Despite the importance of super star clusters throughout the universe, the physical conditions and environments required for their formation are almost completely unconstrained by existing observations. Based on a recently completed radio survey, we have identified a number of candidate extremely young (natal) super star clusters in a sample of nearby starburst galaxies. These sources are still embedded in their natal dust cocoons. We are proposing to add archival Spitzer data to our radio results in order to construct the SEDs of these thermal sources and determine their physical properties. By combining the radio, Spitzer mid−infrared, and near−IR data with 3−D radiation transfer codes, our proposed program will address critical issues related to the birth and early evolution of super star clusters. Using IRAC and MIPS imaging along with IRS spectroscopy, we will investigate the properties of the birth environments, the physical parameters of the embedded stellar clusters and their natal cocoons, and the timescales involved in their formation. The results from this project will ultimately provide insight into star formation and galactic evolution throughout the universe. Thursday March 25, 2010 xgal_covers.txt 365/371
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Extragalactic abstracts - IRSA - California Institute of Technology

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