Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 635/742 Spitzer Space Telescope − General Observer Proposal #50210 Obscured starbursts in galaxy clusters: a MIPS survey of z=0.5 clusters Principal Investigator: Ian Smail Institution: Insitute for Computational Cosmology Technical Contact: Ian Smail, Insitute for Computational Cosmology Co−Investigators: Julie Wardlow, Durham University Jim Geach, Durham University Harald Ebeling, IfA, Hawaii Cheng−Jiun Ma, IfA, Hawaii Alastair Edge, Durham University Science Category: galaxy clusters and groups(high−z) Observing Modes: MipsScan Hours Approved: 35.2 Abstract: We propose panoramic MIPS 24um imaging of four intermediate redshift (z~0.5) clusters selected from the MACS X−ray Survey. We will combine these with observations of four clusters at the same epoch from our pilot study (which span a broader range in mass) to parameterize the evolutionary sequence of infalling field galaxies in terms of the cluster global structure. This analysis will distinguish between the role of global and local environment in determining the star formation histories of starburst galaxies entering the cluster potential from the low−density field. Our previous successful MIPS project has yielded some exciting results − in particular the existence of large populations of starburst galaxies in z~0.5 clusters with strong PAH emission − which have been completely overlooked by previous optical/near−IR surveys of these well−studied systems. These are potentially the missing link between distant spirals and the local passive S0 galaxies which are the dominant population in local clusters. Our initial results point to a strong dependence of star formation on specific cluster properties − either the dynamical state or the cluster mass (or equivalently temperature of the ICM). By specifically targeting four clusters with a narrow range in mass, but a wide range of structures, we aim to determine the key drivers of the variation in the starburst population within clusters. This will provide vital clues as to the physics of environmental transformations of galaxies: an important ingredient of current galaxy evolution models. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 636/742 Spitzer Space Telescope − General Observer Proposal #30263 Obscured activity and environment: a 24um survey of two well−studied clusters at z~0.5 Principal Investigator: Ian Smail Institution: Insitute for Computational Cosmology Technical Contact: Ian Smail, Insitute for Computational Cosmology Co−Investigators: James Geach, Durham University Alastair Edge, Durham University Richard Ellis, Caltech Tommaso Treu, UCSB Tadayuki Kodama, NAOJ Masayuki Tanaka, University of Tokyo Science Category: galaxy clusters and groups Observing Modes: MipsPhot Hours Approved: 15.6 Abstract: We propose to use MIPS to obtain high quality panoramic 24um mid−infrared imaging of galaxies within two rich clusters at z~0.5 which are part of an panoramic photometric survey using Subaru. Our survey traces the galaxy properties within the large scale structure around these massive clusters. In the outer regions of galaxy clusters critical processes take place which transform the properties of in−falling, star−forming spiral field galaxies and convert these to the passive, early−type galaxies which dominate the cluster population. In our optical survey of rich clusters at z=0.4−0.5 we have discovered a sharp dependence with local galaxy density in the apparent star formation activity within galaxies. This critical density threshold is characteristic of groups and filaments. We now propose to extend ourinvestigation of this behaviour using sensitive mid−infrared observations to trace the variation of obscured activity within the large−scale structure around these clusters. This will allow us to construct the evolutionary cycle for galaxies as they are accreted onto a cluster, by tracing the variation in their activity as a function of their environment. The results of our analysis will provide a clearer view of the physical processes responsible for creating the strong environmental variations in galaxy properties which underpin the local morphology−density relation. Thursday March 25, 2010 xgal_covers.txt 318/371
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 637/742 Spitzer Space Telescope − General Observer Proposal #40872 A Joint Spitzer/Lensing Survey − Exploring the Connection Between Hierarchical Assembly and Starburst Activity in Galaxy Clusters at z=0.2 Principal Investigator: Graham Smith Institution: University of Birmingham Technical Contact: Graham Smith, University of Birmingham Co−Investigators: Eiichi Egami, Steward Observatory Richard Ellis, California Institute of Technology Masahiro Takada, Tohoku University Toshifumi Futamase, Tohoku University James Taylor, University of Waterloo Arif Babul, University of Victoria Jean−Paul Kneib, OAMP, Marseilles Phil Marshall, UCSB John Carlstrom, University of Chicago Gus Evrard, University of Michigan Alexis Finoguenov, UMBC Pasquale Mazzotta, CfA Trevor Ponman, University of Birmingham Science Category: galaxy clusters and groups(low−z) Observing Modes: MipsPhot Hours Approved: 34.6 Abstract: We propose to conduct a wide−field Spitzer/MIPS 24um survey of 32 X−ray luminous galaxy clusters at z~0.2. These 32 are drawn from the 100 clusters under intense multi−wavelength study as part of the Local Cluster Substructure Survey (LoCuSS). All 32 have high quality wide−field weak lensing data from Subaru, supplemented by HST imaging of the cluster cores. Our primary science goal is to achieve a definitive survey of starburst activity in local clusters and to correlate the amount of obscured activity with dynamical state of the clusters. The combination of the proposed 25’x25’ MIPS 24um maps and our detailed lensing−based mass maps will be uniquely powerful for that purpose. The superb sensitivity of MIPS will allow us to detect LIRGs in the virialised region of each cluster in just ~1.2 hours per cluster; the structural analysis of the lensing mass maps will diagnose the amount and location of recent hierarchical infall into the clusters. We will therefore be able to quantify precisely the amount of obscured star formation in local clusters and to delineate how that activity relates to hierarchical assembly. Our results will therefore have a major impact on efforts to understand whether infalling spiral galaxies transform into S0 galaxies by gradual fading or via an intense starburst phase. For this huge statistical survey (several orders of magnitude larger than the state of the art), we request a modest 36 hours of observing time. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 638/742 Spitzer Space Telescope − General Observer Proposal #3506 Hot Dust in Cool Cores Principal Investigator: William Sparks Institution: Space Telescope Science Institute Technical Contact: William Sparks, Space Telescope Science Institute Co−Investigators: Megan Donahue, Michigan State University Chris O’Dea, Space Telescope Science Institute Duccio Macchetto, Space Telescope Science Institute Stefi Baum, Space Telescope Science Institute Paul Goudfrooij, Space Telescope Science Institute James Rhoads, Space Telescope Science Institute Sangeeta Malhotra, Space Telescope Science Institute Laura Ferrarese, Rutgers University Patrick Cote, Rutgers University Andres Jordan, Rutgers University James Pringle, University of Cambridge Science Category: galaxy clusters and groups Observing Modes: IracMap MipsPhot Hours Approved: 5.2 Abstract: With IRAC primarily, and MIPS to complement, we propose to obtain sensitive thermal imaging of hot dust in two archetypal, powerful X−ray clusters (cool−core clusters, aka cooling−flows). Dust is pivotal in connecting the diverse environments of these clusters. It provides a window for us to study the physics of interfaces between hot and cold ISM and the transport processes that may be absolutely fundamental in dictating the dominant physical process at work. In these clusters, hot, thermal plasma produces strong X−ray emission, gas a thousand times cooler radiates intense optical emission lines, while molecular and neutral gas are also known to be present, along with ultra−relativistic plasma associated with AGN, radio sources and jets. Recent dramatic observations have shown that all of these disparate aspects of cluster physics may be fundamentally connected, with transport processes and feedback mechanisms potentially critical in developing a consistent and coherent understanding of cluster physics. Thursday March 25, 2010 xgal_covers.txt 319/371
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Extragalactic abstracts - IRSA - California Institute of Technology

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