Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 399/742 Spitzer Space Telescope − General Observer Proposal #20187 Local Benchmarks for the Evolution of Interacting Galaxies Principal Investigator: C. Kevin Xu Institution: California Institute of Technology Technical Contact: C. Kevin Xu, California Institute of Technology Co−Investigators: Roc Cutri, California Institute of Technology, IPAC Donovan Domingue, Georgia College & State University Yu Gao, UMASS Jiasheng Huang, Harvard−Smithsonian Center for Astrophysics Carol Lonsdale, California Institute of Technology, IPAC Nanyao Lu, California Institute of Technology, IPAC/SSC Joe Mazzarella, California Institute of Technology, IPAC Jason Surace, California Institute of Technology, IPAC/SSC Science Category: interacting/merging galaxies Observing Modes: IracMap MipsPhot Hours Approved: 35.3 Abstract: We propose to obtain IRAC and MIPS maps for a sample of close major−merger pairs of galaxies selected from the joint 2MASS/SDSS−DR3 database. This is to provide a highly accurate and unbiased local benchmark for studies on evolution of interacting galaxies. The parent sample (46 pairs) is {\\bf complete}, consisting of all physical pairs (in 3000 deg$^2$) with the primary brighter than K=12.5, projected separations of ${\\rm 5 \\leq r \\leq 20 h^{−1}}$ kpc and stellar mass ratios $\\leq 2.5$ (‘major−mergers’). Other samples of local interacting galaxies selected from photographic plates are severely biased. The existing Spitzer programs on local IR selected galaxies and on Arp peculiar galaxies won’t be able to constrain the average SFR of interacting galaxies as a population. Similarly, the low density of local interacting galaxies means that existing Spitzer areal surveys such as SWIRE won’t be able to provide such a local sample. The K−band luminosity function and the differential pair fraction for these pairs provide the local benchmark for the density evolution of interacting galaxies. With the proposed Spitzer observations, we aim to obtain in the first time the unbiased statistics on the SFR and SF strength (SFR per unit stellar mass) of local binary galaxies. This will provide the local benchmark for the luminosity evolution of interacting galaxies. The proposed sample (26 pairs, 52 galaxies) includes all S+S and E+S pairs in the parent sample which have measured redshifts for both components (i.e. spectroscopically confirmed pairs). Multiband (ugrizJHK) images and optical spectrographs available in the SDSS−DR3 and 2MASS database, and the UV images taken from the GALEX All−Sky survey will provide additional information for the star formation activities in these sources. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 400/742 Spitzer Space Telescope − General Observer Proposal #20140 The Spitzer Interacting Galaxies Survey : Investigating the connection between activity and galaxy interactions Principal Investigator: Andreas Zezas Institution: Harvard−Smithsonian Center for Astrophysics Technical Contact: Andreas Zezas, Harvard−CfA Co−Investigators: Howard Smith, Harvard−Smithsonian Center for Astrophysics Matthew Ashby, Harvard−Smithsonian Center for Astrophysics Eduardo Gonzales−Alfonso, Universidad de Alcala de Henares, Sarah Higdon, Cornell Jiasheng Huang, Harvard−Smithsonian Center for Astrophysics Chris Mihos, Case Western Reserve University Luigi Spinoglio, IFSI−CNR, Rome, Italy Jason Surace, Caltech−IPAC Zhong Wang, Harvard−Smithsonian Center for Astrophysics Steve Willner, Harvard−Smithsonian Center for Astrophysics Thomas Cox, Harvard−Smithsonian Center for Astrophysics Mike Pahre, Harvard−Smithsonian Center for Astrophysics Science Category: interacting/merging galaxies Observing Modes: IracMap IrsStare MipsPhot Hours Approved: 49.0 Abstract: We propose a sensitive, coherent study of a representative sample of 110 nearby interacting galaxies. Our goal is to investigate, using a large statistically meaningful sample, how galaxy interactions induce galactic activity either in the form of widespread star−formation or AGN activity. We will use deep IRAC, IRS and MIPS observations to penetrate the obscuration that characterizes galactic nuclei and star−forming regions in order to map the star−forming activity throughout the galaxies and detect and measure AGN activity. This in concert with simulations of galaxy interactions will allow us to address questions like : (1) how do interactions trigger star−formation; (2) how large concentrations of gas and dust in the central regions may promote or hide AGN activity and (3) if and how star−forming and AGN activity relates with the parameters of the interaction. Our team includes experts in Spitzer post−pipeline data reduction, analysis and theoretical modeling. Although we plan an extensive analysis and modeling effort, we intend the release the data to the community with no proprietary period once the sample is completed. Thursday March 25, 2010 xgal_covers.txt 200/371
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 401/742 Spitzer Space Telescope − Theoretical Research Proposal #50093 X−ray Effects on Spitzer IRS Emission−Line Diagnostics Principal Investigator: Nicholas Abel Institution: University of Cincinnati Technical Contact: Nicholas Abel, University of Cincinnati Co−Investigators: Philip Stancil, University of Georgia Shobita Satyapal, George Mason University Science Category: AGN/quasars/radio galaxies Dollars Approved: 50000.0 Abstract: Recent investigations into x−ray irradiated atomic and molecular gas (XDRs) present a challenge to interpreting IRS observations of AGNs, ULIRGs, and protoplanetary disks. XDR models predict strong [Ne II], [Ar II], and [S III] emission, spectral diagnostics which are usually assumed to emerge from H II regions. These diagnostics are widely used to infer physical properties such as galaxy energetics, density, and the shape of the spectral energy distribution. A non−H II region component represents a gap between observation and theory. IRS observations cannot distinguish between XDR and H II emission, due to insufficient spectral resolution. Without sufficient resolution, the best way to separate out the H II and XDR components of [Ne II], [Ar II], and [S III] in the IRS spectrum is to calculate the contribution of each region to the total intensity. To date, no XDR + H II region calculation exists. The goal of this proposal is to understand the role of XDRs and H II regions to important IRS spectral diagnostics. We will determine the effect of the XDR on the IRS spectroscopy by including important XDR processes into the spectral synthesis code Cloudy. These processes include charge transfer reactions between multiply ionized Ne, S, and Ar with H and H2, collisional excitation of [Ne II], [Ar II], and [S III] with H and H2, and other high energy atomic and molecular processes. We will use these theoretical tools to study, over a wide range of physical conditions, the contribution XDRs makes to the overall emission of important IRS emission−line diagnostics. In so doing, we will provide a way to separate out the XDR and H II components in IRS observations, increasing the scientific return of Spitzer. The theoretical improvements will make Cloudy the only computer simulation capable of modeling H II regions and XDRs self−consistently. In addition, since Cloudy is a publicly available code, the results of this proposal will be immediately available to the astrophysical community. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 402/742 Spitzer Space Telescope − Directors Discretionary Time Proposal #239 AGN Spectral Energy Distributions of GLAST Telescope Network Program Objects Principal Investigator: Jeff Adkins Institution: Deer Valley High School Technical Contact: Mark Lacy, Spitzer Science Center Co−Investigators: Linda Stefaniak, Allentown High School Steve Rapp, Linwood Holton Governor’s School Doris Daou, Spitzer Science Center Science Category: AGN/quasars/radio galaxies Observing Modes: IracMap MipsPhot Hours Approved: 0.4 Abstract: The Gamma−Ray Large Area Space Telescope (GLAST) has a proposed observing list that includes AGNs and Polars bright enough to be observed optically by amateurs and students. This observing list is maintained by the "GLAST Telescope Network" (GTN) and includes a number of objects that have yet to be observed by the Spitzer Space Telescope. Our project will observe one of these objects with the Spitzer MIPS and the IRAC instruments to determine their Spectral Energy Distribution (SED), which will be compared to a computer model of disk emission in order to determine what component of the SED is due to the disk and what component is due to synchrotron radiation induced by the jets. In addition we will observe our program objects prior to, simultaneously with, and after Spitzer observes them. This gives a direct connection from Spitzer research to student activities in the classroom. Thursday March 25, 2010 xgal_covers.txt 201/371
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Extragalactic abstracts - IRSA - California Institute of Technology

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