Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 623/742 Spitzer Space Telescope − General Observer Proposal #3384 Mid−Infrared Spectroscopy of Massive Cluster Cooling Flows Principal Investigator: Robert O’Connell Institution: University of Virginia Technical Contact: Robert O’Connell, University of Virginia Co−Investigators: Brian McNamara, Ohio University Michael Wise, MIT Megan Donahue, Michigan State University Mark Voit, Michigan State University Paul Nulsen, Center for Astrophysics Science Category: galaxy clusters and groups Observing Modes: IrsMap IrsStare Hours Approved: 14.5 Abstract: Cooling flows in X−ray bright clusters of galaxies can deposit large amounts of cooled intracluster gas on the galaxies at their centers. A wide variety of UV/optical/IR signatures of deposition have been found, including evidence for cooled gas and dust and for star formation at rates of ~10−300 M_sun/yr. Recent Chandra and XMM−Newton soft X−ray spectroscopy shows that the energy balance of the intracluster gas is strongly affected by heating from a highly efficient feedback mechanism, which is not yet identified. We propose to obtain Spitzer/IRS mid−IR spectral maps to explore the deposition process in five archetypal cluster cooling flows. Our specific interests include assessing the relation of the dust to the cooling flow and obtaining greatly improved estimates of the star formation rates for comparison to the deposition rates. The basic mechanisms of cooling and energy feedback which can be studied in the mid−IR in these systems are relevant to a wide range of galaxy astrophysics. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 624/742 Spitzer Space Telescope − General Observer Proposal #40460 Shocked Baryons and Star Formation in a High−Redshift Protocluster Principal Investigator: Patrick Ogle Institution: Spitzer Science Center Technical Contact: Patrick Ogle, Spitzer Science Center Co−Investigators: Phil Appleton, NHSC−Caltech Dario Fadda, NHSC−Caltech Nick Seymour, Spitzer Science Center Science Category: galaxy clusters and groups(high−z) Observing Modes: IrsMap Hours Approved: 42.8 Abstract: The origin of hot baryons in the massive intracluster media of galaxy clusters is an unsolved mystery. We will map the potential sources of hot baryons in a high−redshift, radio−selected galaxy protocluster. We propose a very deep (6 hr/pixel), 2 square arcminute spectral map of the redshift z=2.156 protocluster surrounding the MRC 1138−262 radio galaxy. Spitzer IRS LL observations will map star formation, AGN activity, and shocked molecular hydrogen in a large number of cluster galaxies. The recent Spitzer discovery of massive, high luminosity molecular hydrogen emission in galaxy clusters and radio galaxies motivates our search. High−velocity galaxy collisions, starburst super−winds, relativistic radio jets, and cluster accretion shocks are all potential mechanisms for shocking, disrupting, and removing the cool baryons in galaxy potential wells and ejecting them into the intracluster medium. Spitzer is sensitive to all of these processes through detection of the pure−rotational lines of molecular hydrogen and PAH emission from luminous, star−forming infrared galaxies and AGNs. Thursday March 25, 2010 xgal_covers.txt 312/371
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 625/742 Spitzer Space Telescope − General Observer Proposal #3475 A MIPS Investigation of Cold Dust Surrounding Gas−Rich Dwarf Galaxies in the Virgo Cluster Principal Investigator: Cristina C. Popescu Institution: Max Planck Institut fuer Kernphysik Technical Contact: Cristina Popescu, University of Central Lancashire Co−Investigators: Richard J. Tuffs, Max Planck Institut fuer Kernphysik, Astrophysics Barry F. Madore, Observatories of the Carnegie Institution of Washi Armando Gil de Paz, Observatories of the Carnegie Institution of Washi Heinrich J. Voelk, Max Planck Institut fuer Kernphysik Science Category: galaxy clusters and groups Observing Modes: MipsPhot Hours Approved: 11.4 Abstract: We propose deep MIPS raster maps of extended fields centered on 11 gas−rich dwarf galaxies in the Virgo Cluster. The MIPS maps will elucidate the nature of the very cold dust outside the optical extent of these galaxies, as discovered by us with ISOPHOT. The 11 targets were selected either because they exhibit 170 micron emission from cold dust extending beyond the optical body of the galaxies (by factors of up to more than 3.5), and/or because they have extremely high 170/100 flux density ratios. The superior sensitivity and improved angular resolution of MIPS will allow us to obtain the first 2D maps of the extended 160 micron cold dust emission with detailed morphological information. The same large fields will also be mapped at 70 micron to obtain a spatial template of the cirrus emission which is the dominant source of confusion at 160 micron. The resulting deep MIPS maps at 160 micron will constitute a unique probe for distinguishing between the different scenarios for the wider existence, origin and heating mechanisms of the extended cold dust. We propose to exploit the excellent sensitivity of MIPS at 24 and 70 micron to measure the expected warm dust emission from the HII regions within these galaxies. This will probe the link − if any − between the dust powered within the optical disk and dust external to this disk. Comparison with CO, submm and optical broad/narrow band maps (all data already obtained and reduced by us) of the optical body of the dwarfs will be used to completely characterize the dust and gas content as well as the star formation properties and stellar mass of the central galaxy. Our observations will throw light on the relation of the dwarf galaxies to their ambient medium. They will also be important in a cosmological context, since gas−rich dwarf galaxies may prevail at the earliest epochs, making a higher contribution to the total FIR output of the early Universe than previously expected. The total AOR time for the proposed MIPS observations is 11.4 h. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 626/742 Spitzer Space Telescope − Guaranteed Time Observer Proposal #50589 Unveiling the Effects of Environment on Star Formation in Galaxy Groups Principal Investigator: George Rieke Institution: The University of Arizona Technical Contact: Krystal Tyler, University of Arizona Co−Investigators: Ivelina Momcheva, University of Arizona Krystal Tyler, University of Arizona Lei Bai, University of Arizona Marcia Rieke, University of Arizona Ann Zabludoff, University of Arizona Delphine Marcillac, University of Arizona John Mulchaey, Carnegie Institution of Washington Science Category: galaxy clusters and groups(high−z) Observing Modes: MipsPhot Hours Approved: 22.3 Abstract: As galaxies evolve, they are subject to a menagerie of violent events that can disrupt or entirely subdue ongoing star formation. Nowhere is this more apparent than in high−density environments. Clustering due to hierarchical formation results in interactions between galaxies and the intracluster medium, leading to the demise of star formation and the rise of red sequence galaxies. However, correlations between local density and galaxy properties like morphology, star formation rate, and color exist from the largest clusters down to the poorest groups. It is likely, since the majority of galaxies lie in groups, that global trends in fundamental properties are driven by this environment. That is, the strong observed decline in star formation rate from z ~ 1 is likely to be directly related to processes affecting group galaxies. Despite this, groups are rarely studied, especially compared to the massive amounts of data available for clusters. Indeed, if we wish to study the effect of density on galaxy evolution, we need to focus on all densities. We propose to observe 48 groups of galaxies at intermediate redshifts (0.12 < z < 0.82), the era where strong evolution and transformation are expected for groups, with MIPS at 24−microns. This waveband is ideal for studying obscured star formation in galaxies, which is especially useful for our intermediate redshift range, where other star formation indicators, such as H−alpha and [OII] emission lines, become difficult to acquire and/or correct for obscuration. We will combine our groups with additional data for nearby groups and those at z ~ 1, as well as data for clusters at similar redshifts, to study the effects of a wide variety of densities on galaxy evolution from z ~ 1 to the present. Thursday March 25, 2010 xgal_covers.txt 313/371
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Extragalactic abstracts - IRSA - California Institute of Technology

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