Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 619/742 Spitzer Space Telescope − General Observer Proposal #40044 A MIPS Survey of a Representative Sample of Galaxy Groups Principal Investigator: John Mulchaey Institution: Carnegie Institution of Washington Technical Contact: John Mulchaey, Carnegie Institution of Washington Co−Investigators: Trevor Ponman, University of Birmingham Somak Raychaudhury, University of Birmingham Jesper Rasmussen, University of Birmingham Chandreyee Sengupta, RRI Frazer Pearce, University of Nottingham Science Category: galaxy clusters and groups(low−z) Observing Modes: MipsScan Hours Approved: 36.6 Abstract: Most galaxies in the universe are members of groups. Groups are, therefore, an important laboratory for studying the processes associated with galaxy formation and evolution. To better understand the group environment and its role on galaxy evolution, we are carrying out the first detailed optical, X−ray and HI study of an unbiased sample of nearby groups. Each group in our sample is being observed with the IMACS wide−field multi−object spectrograph on the Magellan I telescope, XMM−Newton and the GMRT. Our existing data suggests that a large fraction of group galaxies are undergoing active star formation and that the level of star formation is linked to the evolutionary stage of the group itself. However, our current star formation estimates may be significantly underestimated due to dust obscuration and the fact that our spectroscopic slits cover only the central regions of each galaxy. To obtain more robust estimates of the star formation properties, we propose a MIPS 24 and 70 micron imaging survey of our group sample. The proposed MIPS observations will probe to very low star formation rates (0.1 solar mass per year) allowing for an accurate census of the star formation activity in each system. The combination of our existing IMACS, XMM and GMRT data with the proposed MIPS observations will allow us to address the following questions:1) How do the star formation rates of galaxies in groups vary with the evolutionary state of the group?, 2) Are dusty starbursts common in galaxy groups?, 3) How have the galaxy populations in groups evolved over time? and 4) What mechanisms drive galaxy evolution in groups? Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 620/742 Spitzer Space Telescope − General Observer Proposal #50475 A Spitzer Survey of the NGC 2563 Group of Galaxies Principal Investigator: John Mulchaey Institution: Carnegie Institution of Washington Technical Contact: John Mulchaey, Carnegie Institution of Washington Co−Investigators: Jacqueline van Gorkom, Columbia University Ann Zabludoff, University of Arizona Eric Wilcots, University of Wisconsin Paul Martini, Ohio State University Jesper Rasmussen, Carnegie Institution of Washington Science Category: galaxy clusters and groups(low−z) Observing Modes: IracMap MipsScan Hours Approved: 18.1 Abstract: We propose an IRAC and MIPS imaging survey of the NGC 2563 group of galaxies. As one of the nearest X−ray groups, this system is an ideal target to study the role of galaxy−intragroup medium interactions in galaxy evolution. We have been awarded a large program with Chandra to trace the hot baryons in this group and have used the VLA to measure the HI properties of the group members down to very low gas masses. The proposed Spitzer observations will be used to map out the dusty ISM, study the old stellar populations and quantify the star formation properties of the group members. Combined with our extensive optical, HI and X−ray data, the Spitzer data will provide a complete census of the major baryonic components in this group. A key element of our program is that we are studying the group population out to the virial radius of the system. Our program has been designed to provide the first comprehensive study of the galaxies in an X−ray group and in many ways is the group equivalent to the extensive studies of richer systems like the Virgo and Coma clusters. Thursday March 25, 2010 xgal_covers.txt 310/371
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 621/742 Spitzer Space Telescope − General Observer Proposal #20760 IRAC Imaging of the Most Distant X−ray Massive Galaxy Cluster at z=1.4 Principal Investigator: Christopher Mullis Institution: University of Michigan Technical Contact: Christopher Mullis, University of Michigan Co−Investigators: Piero Rosati, European Southern Observatory Hans Boehringer, Max−Planck Institut fur extraterrestrische Physik Axel Schwope, Astrophysikalisches Institut Potsdam Georg Lamer, Astrophysikalisches Institut Potsdam Rene Fassbender, Max−Planck Institut fur extraterrestrische Physik Peter Schuecker, Max−Planck Institut fur extraterrestrische Physik Veronica Strazzullo, European Southern Observatory Science Category: galaxy clusters and groups Observing Modes: IracMap Hours Approved: 4.0 Abstract: We propose to obtain deep IRAC imaging of the most distant X−ray−luminous cluster of galaxies found to date. XMMU J2235.3−2557 was first detected as an extended XMM−Newton X−ray source and then spectroscopically confirmed at z=1.393 with the VLT−FORS2. Based on its high X−ray luminosity, ICM gas temperature, and optical/NIR richness, this galaxy cluster is very likely the most distant and most massive (z>1) structure yet identified. The proposed IRAC observations will measure the rest−frame near−IR flux of the z=1.4 cluster galaxies. This flux is known to be strongly correlated with the underlying stellar mass. We will construct the rest−frame near−IR luminosity function, derive the stellar mass function, and perform SED fitting to constrain galaxy ages and masses at the largest look−back times ever probed with clusters. With these diagnostics extracted from the high−density cluster environment, combined with complementary measures in the field population, we will directly test the predictions of competing models of galaxy formation. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 622/742 Spitzer Space Telescope − General Observer Proposal #30659 A Census of Star Formation in Brightest Cluster Galaxies: Is Star Formation the Ultimate Fate of the Cooling Gas? Principal Investigator: Christopher O’Dea Institution: Rochester Institute of Technology Technical Contact: Christopher O’Dea, Rochester Institute of Technology Co−Investigators: Alastair Edge, University of Durham Andy Fabian, University of Cambridge Brian McNamara, Ohio University Steven Allen, Stanford Alice Quillen, University of Rochester Mark Voit, Michigan State University Stefi Baum, Rochester Institute of Technology Richard Wilman, University of Durham William Sparks, STScI Paul Goudfrooij, STScI Duccio Macchetto, STScI Carolin Crawford, University of Cambridge Roderick Johnstone, University of Cambridge David Frayer, IPAC Craig Sarazin, University of Virginia Joel Bregman, University of Michigan George Rieke, University of Arizona Eiichi Egami, University of Arizona Science Category: galaxy clusters and groups Observing Modes: IracMap MipsPhot Hours Approved: 33.2 Abstract: We propose a comprehensive IRAC and MIPS survey of a sample of X−ray selected low redshift brightest cluster galaxies with high H−alpha luminosities to determine the star formation properties of the key class of galaxy. The giant ellipticals in cluster cores have long been regarded as old, quiescent galaxies free of dust and star−formation. However, recent optical, sub−mm, and Spitzer mir−far IR observations have shown that this is not the case in the cores of cooling flows. Instead, substantial masses of both molecular gas (1E9−11 solar masses) and dust (1E7−8 solar masses) are found. Spitzer IRAC and MIPS observations of a few clusters have suggested that the BCGs with high X−ray luminosity and short cooling times or equivalently high H−alpha luminosities exhibit IR luminosities consistent with dust heated by star formation at rates of tens of solar masses per year (Egami et al 2006). These star formation rates are now consistent with the revised X−ray derived mass deposition rates offering the exciting possibility of a solution to the conundrum of cooling flows. These observations also revealed that the one source in their sample which hosted a powerful radio source had a star formation rate much lower than the inferred mass deposition rate, consistent with feedback from the central AGN lowering the mass inflow rate. These results are based on observationsof only a few clusters. With the observations proposed here we will be able to explore the relationship between the ICM, cooling flows, star formation, and AGN activity in BCGs and put these tentative results on firm statistical footing. We will obtain constraints on the fate of cooling gas, heating and cooling processes in the ICM, the nature of star formation in the central galaxies, and the activity of the central massive black hole. We anticipate that for this data set will be of great interest to a large number of researchers and will reduce our proprietary period. Thursday March 25, 2010 xgal_covers.txt 311/371
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Extragalactic abstracts - IRSA - California Institute of Technology

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