Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 611/742 Spitzer Space Telescope − General Observer Proposal #50393 Investigating the Triggers of Starburst Activity in Galaxy Clusters Principal Investigator: Dale Kocevski Institution: University of California, Davis Technical Contact: Dale Kocevski, University of California, Davis Co−Investigators: Harald Ebeling, University of Hawaii Cheng−Jiun Ma, University of Hawaii Science Category: galaxy clusters and groups(high−z) Observing Modes: IracMap MipsScan Hours Approved: 16.0 Abstract: The physical processes responsible for driving the transformation of star−forming field galaxies to passively evolving cluster members are still poorly understood. Several mechanisms have been proposed, some of which would directly suppress star formation activity, while others would instead trigger a burst of star formation that subsequently consumes most of a galaxy’s gas supply. We can directly test for this latter class of mechanisms by searching for a starburst population of galaxies in and around clusters. Furthermore since many of the proposed processes are most effective at different galaxy and gas densities, the location and properties of the local environments in which these galaxies are found will help constrain the mechanism which trigger their activity. We propose 3.6−8 micron IRAC and 24 micron MIPS observations of the massive, relaxed cluster MACS J1423.8+2404 at z=0.54 in order to carry out a comparative study with our pending observations of the morphologically disturbed cluster MACS J0717.5+3745 at z=0.55. While the two systems have nearly identical global properties, there is ongoing galaxy accretion into MACS J0717.5+3745 through a large−scale filament connected to the system, whereas no such activity or signs of significant substructure are detected in MACS J1423.8+2404. We intend to use the observations to map the distribution of any galaxies undergoing a starburst phase from the cluster core out to the field population. The distinct environments offered by the two clusters, one with actively infalling galaxies and the other with a more virialized population, will allow us to better isolate the effects that these conditions have on triggering starburst activity. Furthermore, similarities in the global properties of the two clusters, such as system redshift and mass, will enable us to disentangle the role of large−scale versus local environment in driving galaxy evolution in these systems. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 612/742 Spitzer Space Telescope − General Observer Proposal #20277 The Unique Cluster Lens SDSS1004+4112 Principal Investigator: Christopher Kochanek Institution: The Ohio State University Technical Contact: Christopher Kochanek, The Ohio State University Co−Investigators: Nicholas Morgan, The Ohio State University Xinyu Dai, The Ohio State University Thomas Broadhurst, Tel Aviv University Masamune Oguri, Department of Astrophysical Sciences, Princeton Un Science Category: galaxy clusters and groups Observing Modes: IracMap Hours Approved: 6.8 Abstract: SDSS1004+4112 is a unique example of a cluster lens because of its relatively high lens redshift (zlens=0.68), the existence of multiply imaged quasars for which time delays are measured, the presence of a significant number of multiply imaged background galaxies, and a quasar host galaxy that is so magnified that it can be observed in the mid−IR. By combining a deep 4−channel IRAC image with a NICMOS mosaic of the central, multiply−imaged region of the cluster, we will study the quasar host galaxy, search for low−mass substructure in the cluster, obtain accurate photometric redshifts for lensed arcs, discover very red lensed arcs and develop an accurate mass model for the cluster. Then we will combine all the data to obtain a competitive constraint on the cosmological model. Thursday March 25, 2010 xgal_covers.txt 306/371
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 613/742 Spitzer Space Telescope − General Observer Proposal #20451 A Mid−Infrared Survey of Gravitational Lenses Principal Investigator: Christopher Kochanek Institution: The Ohio State University Technical Contact: Christopher Kochanek, The Ohio State University Co−Investigators: Nicholas Morgan, The Ohio State University Xinyu Dai, The Ohio State University Emilio Falco, Smithsonian Astrophysical Observatory Science Category: galaxy clusters and groups Observing Modes: IracMap Hours Approved: 8.7 Abstract: We will use mid−IR IRAC images of six gravitational lenses to understand a basic problem of gravitational lenses −− why simple lens models explain the image positions but not the image fluxes. We know from models of lensed quasar host galaxies observed by HST that the problem does not lie in our models for the gravitational potential of the main lens galaxy. For optical and near−IR data, the explanation can be propagation effects (dust), microlensing by stars in the lens galaxy, or what is known as cold dark matter (CDM) substructure (satellites) of the lens galaxy. The mid−IR fluxes are immune to both dust and microlensing −− the wavelength is to long to be bothered by dust and the emission region is to large to be bothered by microlensing. If the mid−IR flux ratios are still unexplained by simple lens models, the cause must be the predicted (and much debated) CDM substructure. Thus, the SST/IRAC observations will provide a simple test of a basic prediction of cold dark matter models for the formation of galaxies. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 614/742 Spitzer Space Telescope − General Observer Proposal #50342 Exploring the Web : Galaxy Evolution in High−Redshift Superclusters Principal Investigator: Lori Lubin Institution: University of California Technical Contact: Lori Lubin, University of California Co−Investigators: Brian Lemaux, UC Davis Dale Kocevski, UC Davis Christopher Fassnacht, UC Davis Roy Gal, Institute for Astronomy Neal Miller, JHU Gordon Squires, SSC/Caltech Mark Lacy, SSC/Caltech Jason Surace, SSC/Caltech Science Category: galaxy clusters and groups(high−z) Observing Modes: IracMap MipsScan Hours Approved: 32.8 Abstract: We propose deep IRAC and MIPS mapping of the Cl 1324 supercluster at z = 0.7 which contains 7+ clusters and extends 22 Mpc x 100 Mpc. The supercluster is already the subject of a multi−faceted program including (1) deep r’i’z’JK imaging from the Palomar 5−m and UKIRT 3.8−m to measure optical/near−IR colors, (2) spectroscopy with DEIMOS on the Keck 10−m to measure stellar content and [OII] emission for over 400 supercluster members, and (3) high−angular−resolution Chandra and VLA observations to study the starburst and AGN populations. Based on comparisons with our well−studied (in the optical, mid−IR, radio, and X−ray) and similarly−sized Cl 1604 supercluster at z = 0.9, we find significant evolution over only ~1 Gyr, with substantially smaller contributions from [OII]−emitting and starburst galaxies in the Cl 1324 supercluster. Because dust will severely bias measurements made in the optical, we require 3.6−24 micron observations to measure accurately stellar mass, star formation rate, and nuclear/starburst activity in the member galaxies and determine the true extent of evolution over this timescale. With the combined observations of the Cl 1324 and Cl 1604 superclusters, we have the unique opportunity to constrain the effect of large scale environment on galaxy evolution, the physical mechanisms responsible for fueling starburst and nuclear activity, and the timescales of gas quenching and black−hole accretion. Thursday March 25, 2010 xgal_covers.txt 307/371
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Extragalactic abstracts - IRSA - California Institute of Technology

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