Extragalactic abstracts - IRSA - California Institute of Technology

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Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 643/742 Spitzer Space Telescope − General Observer Proposal #50720 Mid−Infrared Imaging of the z=0.9 Super−Cluster RCS2319 Principal Investigator: Tracy Webb Institution: McGill University Technical Contact: Tracy Webb, McGill University Co−Investigators: Mike Gladders, University of Chicago Erica Ellingson, University of Colorado, Boulder Howard Yee, Univesity of Toronto Adam Muzzin, Yale University David Gilbank, University of Waterloo Amelia Hicks, University of Virgina Science Category: galaxy clusters and groups(high−z) Observing Modes: IracMap MipsPhot Hours Approved: 9.8 Abstract: The Red−Sequence Cluster Survey (RCS) has recently discovered a rare grouping of three massive (~5x10^14 M) galaxy clusters, at a spectroscopically confirmed redshift of z = 0.9. With separations of ~5 Mpc, this structure is a clear example of the ancestors of today’s most massive galaxy clusters. The richest cluster of the three was observed with Spitzer in Cycles 3 and 4 as part of a large program (40 clusters), designed to study the evolution of clusters and cluster galaxies; here we request time to obtain similar data on the second two clusters within the super−structure. Infrared imaging with Spitzer IRAC and MIPS will facilitate a comprehensive study of the galaxy population within this structure by (1) tracing stellar mass; (2) quantifying the dust−enshrouded activity; (3) separating star−forming systems from dusty AGN; and (4) constraining star formation rates and total luminosities of cluster galaxies. Key to the success of this program is the wealth of data we have obtained at other wavelengths including 1000’s of spectra in the supercluster field, and deep X−ray and radio imaging with Chandra and the VLA over the entire area. Together, these data afford the unique opportunity to fully characterize the galaxy population within the unambiguous progenitor of the massive local clusters. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 644/742 Spitzer Space Telescope − General Observer Proposal #3440 Dust Emission in the Intra−Group Medium (IGM) of Stephan’s Quintet Principal Investigator: C. Kevin Xu Institution: California Institute of Technology Technical Contact: C. Kevin Xu, California Institute of Technology Co−Investigators: Phil Appleton, Caltech, SSC/IPAC Michael Dopita, Australian National University Gao Yu, UMASS Nanyao Y. Lu, Caltech, SSC/IPAC Cristina Popescu, MPIK, Germany Jack Sulentic, University of Alabama Richard Tuffs, MPIK, Germany Min Yun, UMASS Science Category: galaxy clusters and groups Observing Modes: IrsStare MipsPhot Hours Approved: 7.0 Abstract: Stephan’s Quintet (SQ) is the best studied example of the compact group phenomenon and provides the first solid evidence for diffuse IGM dust emission. We propose MIPS 70um and 160um observations in the raster mapping mode, and IRS observations with SH, LH, SL 1st−order and SL 2nd−order modules in the staring mode. The observations will search for clues to the origin of diffuse IGM dust emission that we detected with ISO. They will also set constraints to physical models for IGM dust destruction in the large scale shock that was triggered by a high speed collision (~ 1000 km/sec) between an intruder galaxy and the IGM. A 6’ x 6’ area will be mapped with MIPS to study the spatial distribution and heating mechanism of the diffuse dust. In addition two positions in the shock front will be observed with IRS to probe PAH destruction and the physical conditions in the ionized medium of the shock. The observations will shed new light on the so−called ‘feedback’ processes governing the exchange of mass, metals and energy between galaxies and their external environment. Thursday March 25, 2010 xgal_covers.txt 322/371
Spitzer_Approved_Extragalactic Mar 25, 10 16:24 Page 645/742 Spitzer Space Telescope − General Observer Proposal #50610 Charting Cluster Mass Build−up using Luminous IR Galaxies Principal Investigator: Min Yun Institution: University of Massachusetts Technical Contact: Min Yun, University of Massachusetts Co−Investigators: Grant Wilson, University of Massachusetts Giovanni Fazio, CfA Jiasheng Huang, CfA Matthew Ashby, CfA David Hughes, INAOE, Mexico Itziar Aretxaga, INAOE, Mexico James Lowenthal, Smith College Thushara Perera, University of Massachusetts Kimberly Scott, University of Massachusetts Jason Austermann, University of Massachusetts Josh Younger, Harvard University Science Category: galaxy clusters and groups(high−z) Observing Modes: IracMap MipsPhot Hours Approved: 94.6 Abstract: An important legacy of Spitzer telescope is that it has established the increasing importance of IR luminous (LIRG) and ultraluminous IR galaxies (ULIRGs) in the cosmic star formation and mass assembly history to z>1. Hierarchical models of galaxy formation and evolution and the popular notion of ‘‘downsizing’’ suggest that so−called "submillimeter galaxies" (SMGs) with $L(IR)=10^{12−13}L_odot$ likely play an important role in the mass assembly history at z>1−2, particularly in high density environments. Using the AzTEC instrument on James Clerk Maxwell Telescope (JCMT) and Atacama Submillimeter Telescope Experiment (ASTE) telescope in Chile, we have constructed a new data base that includes 1000 SMGs (>2 times larger than all previous SMG surveys combined) covering both ‘‘blank’’ and biased/overdensity fields. The main aim of this Spitzer proposal is to map the process by which clusters build up their mass using luminous IR galaxies identified using MIPS 24 micron and AzTEC 1100 micron surveys and to put the SMG phenomenon in the broader context of galaxy and large scale structure evolution. Spitzer_Approved_Extragalactic Printed_by_SSC Mar 25, 10 16:24 Page 646/742 Spitzer Space Telescope − General Observer Proposal #3482 IRAC Imaging of a Proto Galaxy Cluster at z~3 Principal Investigator: Wil van Breugel Institution: UC Merced Technical Contact: Spencer Stanford, University of California, Davis Co−Investigators: Spencer Stanford, University of California, Davis George Miley, Leiden University Bram Venemans, Leiden University Andrew Zirm, Leiden University Huub Rottgering, Leiden University Jaron Kurk, Arcetri Observatory Steve Croft, Lawrence Livermore National Laboratory Science Category: galaxy clusters and groups Observing Modes: IracMap Hours Approved: 28.1 Abstract: We propose to obtain deep IRAC images in all four bands of a z~3 proto galaxy cluster. We have spectroscopically identified 31 star forming galaxies at the redshift of a z=3.16 radio galaxy, MRC0316−257. The IRAC data will sample the rest frame near−IR in the member galaxies, allowing an estimate to be made of the stellar masses. Combined with our existing optical and near−IR photometry, the IRAC data will allow us to search for non−star−forming galaxies in the protocluster, which should be easily detectable if their stellar populations formed at z ~ 5 or greater. Our target lies in the redshift gap between the z ~ 2 and z ~ 4 protoclusters targetted by GTO programs in Cycle 1. So by combining our data with those in the archive, we will be able to determine the formation history of massive galaxies in clusters as they virialize from z ~ 4 to 2, and test the predictions of the hierarchical vs monolithic collapse scenarios. Thursday March 25, 2010 xgal_covers.txt 323/371
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Extragalactic abstracts - IRSA - California Institute of Technology

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