Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 571/742 Spitzer Space Telescope − Legacy General Observer Proposal #20708 A Public Deep IRAC Survey in the Extended CDF−South Principal Investigator: Pieter van Dokkum Institution: Yale Technical Contact: Pieter van Dokkum, Yale Co−Investigators: Pat McCarthy, Carnegie, Pasadena Megan Urry, Yale Hans−Walter Rix, MPIA, Heidelberg Ivo Labbe, Carnegie, Pasadena Marijn Franx, Leiden Eric Gawiser, Yale Jiasheng Huang, CfA Niel Brandt, Penn State Mark Dickinson, NOAO Garth Illingworth, UC Santa Cruz Casey Papovich, U of Arizona Eric Bell, MPIA, Heidelberg Paulina Lira, U de Chile Sukyoung Yi, Oxford Rychard Bouwens, UC Santa Cruz Ned Taylor, Leiden Danilo Marchesini, Yale Science Category: AGN/quasars/radio galaxies Observing Modes: IracMap Hours Approved: 122.9 Abstract: The 0.5 x 0.5 deg area surrounding the CDF−South is the only cosmological survey field that has multi−wavelength coverage from X−rays to the thermal infrared and whose size exceeds the correlation length of massive galaxies at 1
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 573/742 Spitzer Space Telescope − General Observer Proposal #20606 The evolution of early−type galaxies in nearby clusters: breaking the age−metallicity degeneracy with Spitzer IRS Blue Peak−Up Imaging Principal Investigator: Alessandro Bressan Institution: INAF Padova Astronomical Observatory Technical Contact: Alessandro Bressan, INAF Padova Astronomical Observatory Co−Investigators: Pasquale Panuzzo, INAF Padova Roberto Rampazzo, INAF Padova Lucio Buson, INAF Padova Marcel Clemens, INAF Padova Jose Ramon Valdes, INAOE Gian Luigi Granato, INAF Padova Laura Silva, INAF Trieste Luigi Danese, SISSA Science Category: galaxy clusters and groups Observing Modes: IracMap IrsPeakupImage Hours Approved: 48.9 Abstract: We have shown with Cycle 1 observations that Spitzer has the capability of disentangling age and metallicity in old stellar populations. By looking to the broad emission feature left by dust enshrouded asymptotic giant branch stars above 9.7 microns, Spitzer IRS can provide direct evidence that the colour− magnitude relation of Virgo ellipticals is mainly driven by metallicity. However, with the IRS spectrograph we can only probe the bright tail of the colour−magnitude relation, and only in the nearest cluster. We propose to use IRS Blue Peak−Up, the only Spitzer band that looks directly in the core of that spectral feature, to reach fainter galaxies. We will perform a thorough investigation of early type galaxies along the colour−magnitude relation in Virgo and in Coma clusters. These observations, when coupled with already existing IRAC and Optical−NIR observations, will allow a) an unbiased census of the stellar populations in cluster early type galaxies; b) an estimate of the AGB material recycled into the ISM in these systems; c) a direct check of the universality of the colour− magnitude relation on a wide range of magnitudes; d) a spatial study of the stellar populations within the galaxies, e.g. investigating differences between bulge and disk populations within S0; e) the most secure reference frame with which to compare the evolution of early type galaxies in other environments (groups and field). Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 574/742 Spitzer Space Telescope − Archive Research Proposal #50416 Star Formation and AGN Feedback in Brightest Cluster Galaxies Principal Investigator: Megan Donahue Institution: Michigan State University Technical Contact: Megan Donahue, Michigan State University Co−Investigators: G. Mark Voit, Michigan State University Kenneth Cavagnolo, Michigan State University Robert O’Connell, University of Virginia Science Category: galaxy clusters and groups(low−z) Dollars Approved: 100000.0 Abstract: Feedback from active galactic nuclei at the centers of galaxies clusters has become crucial to our understanding of star formation in brightest cluster galaxies (BGCs). X−ray observations have long suggested that intracluster gas should be condensing and forming stars at the centers of galaxy clusters. However, observed levels of star formation in these systems are only 1%−10% of the cooling rate expected from early X−ray imaging. Now Chandra observations are showing clear signs of AGN feedback in the form of cavities in the X−ray gas, indicating that AGNs somehow act to limit star formation in BCGs. Yet, in many BGCs star formation still continues at a reduced level, and there are now abundant observations in the Spitzer archive that can help us study it. We are therefore proposing a Spitzer archival program to compare the IR signatures of star formation in BCGs with X−ray observations of those same systems that provide information about the history of AGN feedback, in order to clarify the relationship between star formation and feedback in the universe’s largest galaxies. Thursday March 25, 2010 xgal_covers.txt 287/371
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