Density Profiles of Massive Clusters at Large Radii

Details Density Profiles of Massive Clusters at Large Radii Density Profiles of Massive Clusters at Large Radii

Feb 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000noao.prop..158w&link_type=abstract

NOAO Proposal ID #2000A-0158

Physics

Scientific paper

We propose to use Mosaic imaging and weak gravitational lensing analysis to make mass profiles to large radius of two of the most interesting galaxy clusters in the Universe. RXJ1347 is the most luminous X-ray cluster and MS1054 is a massive, X-ray hot cluster whose very existence at z=0.83 has been used to argue against Ω=1. Preliminary mass profiles from BTC data show sharp cutoffs at 2-3 Mpc radius. This appears to be a more rapid drop in density than predicted by Navarro, Frenk & White (1997) from N-body CDM simulations. If correct, it may be the first observational evidence for under-dense shells surrounding massive clusters; infalling matter may not be quickly replaced by matter from yet larger radii in some scenarios. However, the limited BTC data in hand need to be augmented in terms of depth and wavelength coverage before such a conclusion can be made with confidence. Finishing these observations will have an additional guaranteed science impact: Mosaic observations of these clusters will also serve as mass calibration for the Deep Lens Survey.

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