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Date and Time of the Query: 2019-04-21 T08:04:07 PDT
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For refcode 2001ApJ...561L..41R:
Retrieve 1751 NED objects in this reference.
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Copyright by American Astronomical Society. Reproduced by permission
2001ApJ...561L..41R Infrared Mass-to-Light Profile throughout the Infall Region of the Coma Cluster K. Rines, M. J. Geller, M. J. Kurtz, A. Diaferio, T. H. Jarrett, and J. P. Huchra Received 2001 August 13; accepted 2001 September 20; published 2001 October 9 ABSTRACT Using a redshift survey of 1779 galaxies and photometry from the Two Micron All Sky Survey covering 200 deg^2^, we calculate independent mass and light profiles for the infall region of the Coma Cluster of galaxies. The redshift survey is complete to K_s_ = 12.2 (622 galaxies), 1.2 mag fainter than M_K_s__^*^ at the distance of Coma. We confirm the mass profile obtained by Geller, Diaferio, and Kurtz. The enclosed mass-to-light ratio measured in the K_s_ band is approximately constant to a radius of 10 h^-1^ Mpc, where M/L_K_s__ = 75 +/- 23 h M_sun_/L_sun_, in agreement with weak-lensing results on similar scales. Within 2.5 h^-1^ Mpc, X-ray estimates yield similar mass-to-light ratios (67 +/- 32 h). The constant enclosed mass-to-light ratio with radius suggests that the K-band light from bright galaxies in clusters traces the total mass on scales <~10 h^-1^ Mpc. Uncertainties in the mass profile imply that the mass-to-light ratio inside r_200_ may be as much as a factor of 2.5 larger than that outside r_200_. These data demonstrate that the K-band light is not positively biased with respect to the mass; we cannot rule out antibias. These results imply that {OMEGA}_m_ = 0.17 +/- 0.05. Estimates of possible variations in M/L_K_s__ with radius suggest that the density parameter is no smaller than {OMEGA}_m_ ~ 0.08. Subject headings: cosmology: observations - dark matter - galaxies: clusters: individual (Coma) - galaxies: kinematics and dynamics - galaxies: photometry
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