Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 595/742 Spitzer Space Telescope − General Observer Proposal #3228 Effects of Cooling Gas, Star Formation, Active Nuclei, and Mergers in Clusters of Galaxies Principal Investigator: William Forman Institution: Smithsonian Astrophysical Observatory Technical Contact: William Forman, Smithsonian Astrophysical Observatory Co−Investigators: Christine Jones, SAO Michael Pahre, SAO Jan Vrtilek, SAO Eugene Churazov, MPA Science Category: galaxy clusters and groups Observing Modes: IracMap Hours Approved: 2.9 Abstract: Spitzer IRAC imaging observations of the two brightest extragalactic X−ray sources, the clusters Virgo/M87 and Perseus/NGC1275 provide an opportunity to sensitively inventory the mass content in cluster cores and to determine the distribution of cool material. While the mass cooling from the hot gas phase has been shown to be smaller than the simple ‘‘cooling flow’’ model, significant amounts of gas are cooling. Many clusters show extended emission line regions, excess blue light from young stars, and dust. Combining images of the X−ray emitting gas, HST and ground−based imaging of the emission line gas, and sensitive radio observations with the high angular resolution of Spitzer IRAC observations will address the perplexing properties found in the central galaxies of rich clusters. Resolved images of cool material around the central galaxies M87/Virgo and NGC1275/Perseus promise new insights in understanding 1) the relationship between galaxy mergers, the matter that they inject into the central regions of clusters, and the onset of activity in the central galaxy, 2) the mass deposition rate in ‘‘cooling flows’’ 3) the origin of the dust associated with the emission line structures and 4) the effects of relativistic plasma, ejected by the central black hole, on the cooling gas and on star formation from this gas. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 596/742 Spitzer Space Telescope − General Observer Proposal #50608 The nature of LIRGs in rich clusters at z~0.5 Principal Investigator: James Geach Institution: Durham University Technical Contact: James Geach, Durham University Co−Investigators: Ian Smail, Durham Sean Moran, Caltech Tommaso Treu, UCSB Richard Ellis, Caltech Alastair Edge, Durham Science Category: galaxy clusters and groups(high−z) Observing Modes: IrsMap Hours Approved: 14.0 Abstract: We propose low resolution mid−IR spectroscopy of members of the rich cluster MS0451−03 at z=0.55 which are bright at 24um, and fall in the luminous infrared galaxy class (LIRG). This cluster is not as rich in active galaxies as others we have studied at this redshift, and we postulate that this cluster−to−cluster scatter could be partially due to the varying efficiency of processes related to global cluster properties on quenching star formation in infalling field spirals. We will test whether the LIRGs in MS0451−03 are powered by starbursts or active galactic nuclei (AGN), and whether their properties differ from an identically selected sample in the cluster CL0024+16, containing a larger population of LIRGs. If the hot ICM of MS0451−03 is more effective at switching off star formation (e.g. via ram pressure stripping), then these LIRGs may be the most gas−rich or intensely star forming galaxies that have survived cluster infall. We may also expect a higher fraction of AGN, since these are likely to be more difficult to ‘switch−off’ via pressure stripping. Understanding the nature of LIRGs in distant clusters is important, because these galaxies are a potential progenitor population of S0 galaxies, abundant in the cores of local rich clusters. Thursday March 25, 2010 xgal_covers.txt 298/371
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 597/742 Spitzer Space Telescope − General Observer Proposal #30718 Spitzer Observations of a GRB−Selected Galaxy Cluster at z=1.8 Principal Investigator: Michael Gladders Institution: Carnegie Observatories Technical Contact: Edo Berger, Carnegie Observatories Co−Investigators: Edo Berger, Carnegie Observatories Ivo Labbe, Carnegie Observatories Science Category: Galaxy Clusters and Groups Observing Modes: IracMap MipsPhot Hours Approved: 5.1 Abstract: We propose IRAC 3.8−8 micron and MIPS 24 micron imaging of a z~1.8 galaxy cluster discovered in association with the short gamma ray burst GRB 050813. This apparent cluster, nominally the highest redshift (by far!) bona−fide cluster known to date, appears as a spatial/color overdensity of ultra−red EROs which is overdense compared to the field by a factor of 40. This unique cluster sits at a redshift which bridges the actively star−forming proto−clusters seen around AGN at higher redshift, and lower redshift collapsed clusters, and we expect to see this transformation in action. The Spitzer will allow us to confirm the reality of this cluster, refine the photometric redshifts, and examine in detail the cluster galaxy population with respect to stellar populations, dust and AGN content, and correlate these to morphology (via in−hand HST−ACS imaging). Detailed modeling of the stellar population of the GRB host galaxy itself (a cluster member) will also set the strictest possible current limits on GRB progenitor lifetimes. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 598/742 Spitzer Space Telescope − General Observer Proposal #40593 Quenched Star Formation in the Bullet Cluster Principal Investigator: Anthony Gonzalez Institution: University of Florida Technical Contact: Anthony Gonzalez, University of Florida Co−Investigators: Sun Chung, University of Florida Christine Jones, Harvard−Smithsonian Center for Astrophysics Doug Clowe, Ohio University Science Category: galaxy clusters and groups(low−z) Observing Modes: IracMap MipsPhot Hours Approved: 5.4 Abstract: We propose to obtain MIPS and IRAC imaging out to the virial radius for the bullet cluster, 1E0657−56, to quantify the impact of a supersonic cluster merger upon star formation in cluser galaxies. Using existing Cycle 2 IRAC observations of the cluster core, we have identified a strong correlation between PAH emission and the projected location of galaxies relative to the shock front. The proposed observations will enable us to both extend this analysis to a wider area, improving the statistics, and establish a more direct link to star formation using 24 micron emission. This data set will be used in conjunction with our extensive multiwavelength data sets, including H−alpha equivalent widths from optical spectroscopy, to provide a complete view of star formation in this unique system. Thursday March 25, 2010 xgal_covers.txt 299/371
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