Journal Article10.1086/115177
Infall patterns around rich clusters of galaxies
Eniko Regos,Margaret J. Geller +1 more
143
TL;DR: In this article, an analytic model for the distribution of galaxies around a cluster core in redshift space is developed, and the high-density caustics in red-shift space are shown to appear as envelopes around rich clusters.
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Abstract: The pattern of infall velocities induced by a rich cluster of galaxies is considered, using an infall model based on the Friedmann solution to determine the exact implicit dependence of the peculiar velocity on the density enhancment and the mean cosmological mass density, Omega(0). An analytic model for the distribution of galaxies around a cluster core in redshift space is developed. The high-density caustics in redshift space are shown to appear as envelopes around rich clusters. Assuming that the galaxies trace the matter distribution, low Omega(0) models can explain observational data obtained for four clusters. The present results support the prediction that light traces mass in the infall region. 26 refs.
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Citations
CIRS: Cluster Infall Regions in the Sloan Digital Sky Survey. I. Infall Patterns and Mass Profiles
TL;DR: In this article, the authors used the fourth data release of the Sloan Digital Sky Survey (SDSS) to test the ubiquity of infall patterns around galaxy clusters and measure cluster mass profiles to large radii.
322
Measuring the ultimate halo mass of galaxy clusters: redshifts and mass profiles from the hectospec cluster survey (hecs)
Kenneth J. Rines,Kenneth J. Rines,Margaret J. Geller,Antonaldo Diaferio,Antonaldo Diaferio,Michael J. Kurtz +5 more
TL;DR: In this paper, the authors used the caustic technique to measure cluster mass profiles from galaxy redshifts obtained with the Hectospec Cluster Survey (HeCS), an extensive spectroscopic survey of galaxy clusters with MMT/Hectopec.
Infall Regions of Galaxy Clusters
TL;DR: In this paper, the amplitude of the velocity field of the infall regions of dark matter halos is used to estimate the mass of galaxy clusters within a few megaparsecs from the halo center.
188
Redshift-Distance Survey of Early-Type Galaxies. I. The ENEARc Cluster Sample
Mariangela Bernardi,Mariangela Bernardi,M. V. Alonso,L. N. da Costa,Christopher N. A. Willmer,Gary Wegner,Paulo S. Pellegrini,C. Rite,M. A. G. Maia +8 more
TL;DR: In this paper, the ENEARc subsample of the larger eNEAR survey of nearby early-type galaxies was used for the construction of a Dn-� distance relation for earlytype galaxies, which has been used to estimate galaxy distances and derive peculiar velocities for the E NEAR all-sky sample.
110
Complex Structure in Class 0 Protostellar Envelopes. III. Velocity Gradients in Non-axisymmetric Envelopes, Infall, or Rotation?
John J. Tobin,John J. Tobin,Lee Hartmann,Edwin A. Bergin,Hsin-Fang Chiang,Leslie W. Looney,Claire J. Chandler,Sébastien Maret,Fabian Heitsch +8 more
TL;DR: In this article, an interferometric kinematic study of morphologically complex protostellar envelopes based on observations of the dense gas tracers N2H + and NH3 is presented.