Gralla, Megan B. and Culverhouse, Thomas and Hawkins, David and Lamb, James and Woody, David (2011) Sunyaev-Zel'dovich Effect Observations of Strong Lensing Galaxy Clusters: Probing the Overconcentration Problem. Astrophysical Journal, 737 (2). Art. No. 74. ISSN 0004-637X http://resolver.caltech.edu/CaltechAUTHORS:20110912-094802780
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We have measured the Sunyaev-Zel'dovich (SZ) effect for a sample of 10 strong lensing selected galaxy clusters using the Sunyaev-Zel'dovich Array (SZA). The SZA is sensitive to structures on spatial scales of a few arcminutes, while the strong lensing mass modeling constrains the mass at small scales (typically <30"). Combining the two provides information about the projected concentrations of the strong lensing clusters. The Einstein radii we measure are twice as large as expected given the masses inferred from SZ scaling relations. A Monte Carlo simulation indicates that a sample randomly drawn from the expected distribution would have a larger median Einstein radius than the observed clusters about 3% of the time. The implied overconcentration has been noted in previous studies and persists for this sample, even when we take into account that we are selecting large Einstein radius systems, suggesting that the theoretical models still do not fully describe the observed properties of strong lensing clusters.
|Additional Information:||© 2011 American Astronomical Society. Received 2010 November 4; accepted 2011 May 17; published 2011 August 8. Support for this work is provided by NSF through award AST-0838187 and PHY-0114422 at the University of Chicago. Support for CARMA construction was derived from the Gordon and Betty Moore Foundation, the Kenneth T. and Eileen L. Norris Foundation, the James S. McDonnell Foundation, the Associates of the California Institute of Technology, the University of Chicago, the states of California, Illinois, and Maryland, and the National Science Foundation. Ongoing CARMA development and operations are supported by the National Science Foundation under a cooperative agreement, and by the CARMA partner universities. S.M. acknowledges support from an NSF Astronomy and Astrophysics Fellowship; C.G. and S.M. from NSF Graduate Research Fellowships; D.P.M. from NASA Hubble Fellowship grant HF-51259.01 Support for T.M. was provided by NASA through the Einstein Fellowship Program, grant PF0-110077. Facility: CARMA|
|Subject Keywords:||galaxies: clusters: general; galaxies: clusters: intracluster medium|
|Classification Code:||PACS: 98.65.Cw, 98.62.Sb, 02.50.Ng|
|Official Citation:||Sunyaev-Zel'dovich Effect Observations of Strong Lensing Galaxy Clusters: Probing the Overconcentration Problem Megan B. Gralla et al. 2011 ApJ 737 74|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Jason Perez|
|Deposited On:||12 Sep 2011 17:14|
|Last Modified:||26 Dec 2012 13:40|
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