Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 575/742 Spitzer Space Telescope − Directors Discretionary Time Proposal #488 Infrared Properties of a Control Sample of Brightest Cluster Galaxies Principal Investigator: Megan Donahue Institution: Michigan State University Technical Contact: Megan Donahue, Michigan State University Co−Investigators: Christopher O’Dea, Rochester Institute of Technology G. Mark Voit, Michigan State Univeristy Kenneth Cavagnolo, Michigan State University Science Category: galaxy clusters and groups Observing Modes: MipsPhot Hours Approved: 1.7 Abstract: Many cluster cores have been observed by Spitzer. However, most of these cores host Brightest Cluster Galaxies (BCGs) with unusual properties, such as large H−alpha luminosities, significant radio sources, or on−going interactions and mergers. We have identified a control sample of six BCGs lacking any of these signatures, in clusters of similarly high mass and X−ray luminosity. Our previous X−ray studies of clusters of galaxies have found that the central gas entropy, an observable quantity from the X−ray data corresponding to kT/n_elec^(2/3), is a direct indicator of gas with short cooling times.The presence of low−entropy X−ray gas in the cores of clusters of galaxies is strongly correlated with the presence of BCGs with star formation or radio sources. Toward the aim of establishing a scientifically solid control sample of BCGs, we are proposing observations of these six BCGs, in clusters whose central gas entropy ranges from low (~10 keV cm^2) to quite high(~300 keV cm^2), at z=0.03−0.09 and L_x>1E44 erg/s. This control sample will allow us to make specific tests of the effects of central entropy and direct comparisons between BCGs which harbor active AGN and star formation and those that do not. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 576/742 Spitzer Space Telescope − General Observer Proposal #40387 Unmasking the Strong Evolution of Cluster Starbursts Principal Investigator: Alan Dressler Institution: Carnegie Institution of Washington Technical Contact: Alan Dressler, Carnegie Institution of Washington Co−Investigators: Augustus Oemler, OCIW Jane Rigby, OCIW Lei Bai, Steward Observatory, Univ of Arizona George Rieke, Steward Observatory, Univ of Arizona Science Category: galaxy clusters and groups(high−z) Observing Modes: MipsPhot Hours Approved: 27.5 Abstract: We propose 24 um observations of galaxies in 3 rich clusters at 0.33 < z < 0.43. We target large volumes in these clusters −−− out to 5 Mpc from the cluster center −− in order to study the star formation history of the infalling galaxies that are building the clusters. Intermediate−redshift clusters are known to include a large population of star−forming galaxies, unlike the passive galaxies of today’s clusters. More remarkably, these starforming galaxies are typically star−bursting rather than continuously−star−forming, a behavior driven by either the cluster environment, or by cosmic evolution, or both. The Spitzer MIPS observations are essential for measuring how much star formation is hidden by dust from our optical spectral diagnostics, and especially for identifying true post−starburst galaxies. For the two principal clusters of our proposal, we bring near−complete spectroscopic samples from IMACS/Magellan that provide ~2000 spectra with redshifts per field, ~250 of which are cluster or supercluster members −− the infalling population. The complete sample allows us to compare the cluster/supercluster population with similar ‘‘field’’ galaxies −− both isolated and in groups. For these two cluster fields, ~1300 foreground and background galaxies are in the redshift range of interest. These are targets for 24 um measurements as much as the cluster galaxies, since a comparison of similar environments, in the outskirts of clusters and in the true field, will test what effect, if any, the cluster is exerting on star forming history of these galaxies. Thursday March 25, 2010 xgal_covers.txt 288/371
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 577/742 Spitzer Space Telescope − General Observer Proposal #50492 Constraining the power output of central galaxies into cluster cores Principal Investigator: Alastair Edge Institution: Durham University Technical Contact: Alastair Edge, Durham University Co−Investigators: Richard Wilman, University of Oxford Andrew Fabian, University of Cambridge Hans Bohringer, MPE Christopher O’Dea, Rochester Mark Swinbank, Durham University Stefi Baum, Rochester Alice Quillen, Rochester Jaehong Park, Rochester Carolin Crawford, University of Cambridge Roderick Johnstone, University of Cambridge Philippe Salome, IRAM, Gernoble George Privon, Rochester Eiichi Egami, University of Arizona Science Category: galaxy clusters and groups(low−z) Observing Modes: IracMap Hours Approved: 8.1 Abstract: The cores of clusters of galaxies are now recognised to be amongst the most dynamic environments known. The high pressure and density of the intracluster medium in the centre of the most massive clusters of galaxies provides a number of astrophysical puzzles. Can AGN provide all of the energy required to prevent large−scale cooling of gas in a cluster core? How long to AGN exist in their active phase? Do all brightest galaxies in cluster cores have an active phase? This proposal draws on results from two programmes that are about to complete data collection. The first is the ESO X−ray Cluster Elliptical Spectral Survey, EXCESS, which is a VLT programme of 446 spectra of every brightest cluster galaxy in the REFLEX X−ray cluster sample. This investment of 192 hours of VLT time has revealed the largest sample of optically line luminous objects known to date. The second program is P30659 (PI O’Dea) that has targeted 63 optically line luminous BCGs in the northern hemisphere and has clearly identified that the most extreme objects show evidence for strong star−formation and/or active galaxy. We propose to observe the 21 optically line luminous EXCESS BCGs with IRAC to provide a definitive sample of these rare objects. These data will inform future HST, APEX, VLT, ALMA and JWST observations of these enigmatic objects. We have already made 12 new CO detections from newly identified EXCESS BCGs with the IRAM 30m telescope and ancipate that this optical spectral library will be the basis of many multi−wavelength studies in the next decade. We request IRAC and MIPS 24um observations as the observations of the O’Dea sample clearly show an excess at 8 and 24um that correlates well with the fluxes at longer wavelengths. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 578/742 Spitzer Space Telescope − General Observer Proposal #50251 IRS Spectroscopic Follow−up of Spitzer Brightest Cluster Galaxy Surveys Principal Investigator: Eiichi Egami Institution: Steward Observatory, University of Arizona Technical Contact: Eiichi Egami, Steward Observatory, University of Arizona Co−Investigators: Christopher O’Dea, Rochester Institute of Technology Alastair Edge, University of Durham Alice Quillen, University of Rochester Stefi Baum, Rochester Institute of Technology Science Category: galaxy clusters and groups(low−z) Observing Modes: IrsStare Hours Approved: 35.1 Abstract: Infrared properties of brightest cluster galaxies (BCGs) are of great interest since they may be related to the intracluster gas cooling process in cluster cores (e.g., cooling flows). Spitzer’s great sensitivity has made it possible for the first time to study the infrared properties of a large number of cluster BCGs systematically. Some interesting results have already emerged from our surveys: (1) infrared−luminous BCGs are only found in the cluster cores with extremely short gas cooling times (
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