NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-04-18 T23:50:11 PDT
Help | Comment | NED Home

For refcode 1993MNRAS.262..187W:
Retrieve 16 NED objects in this reference.
Please click here for ADS abstract

NED Abstract

Copyright by Royal Astronomical Society. 1993MNRAS.262..187W Statistics of lensing by clusters of galaxies I. Giant arcs Xiang-ping Wu, and Francois Hammer DAEC, Observatoire de Paris-Meudon, 92195 Meudon Principal Cedex, France Beijing Astronomical Observatory Chinese Academy of Sciences, Beijing 100080, People's Republic of China Accepted 1992 October 21. Received 1992 October 14; in original form 1991 November 15 ABSTRACT The statistical properties of gravitational lensing by rich distant clusters of galaxies are investigated. The sources of giant luminous arcs are assumed to be moderately luminous spirals similar to those found in deep blue redshift surveys. Arc properties (numbers, axis ratios, etc.) are found to depend strongly on the adopted cluster density profiles and hence provide sharp constraints on the models for matter distribution in clusters. Giant luminous arcs should be present in nearly half of the extremely rich clusters (L_x_ >= 9 x 10^44^ erg s^-1 or {sigma}_v_ >= 1300 km s^-1^), if described by the r^1/4^ law, with a lower incidence by a factor of ~4 for a modified Hubble profile. A considerably smaller number of giant luminous arcs, even fewer than the number of observed events, is predicted by an isothermal model for the cluster density profiles unless the matter is much more concentrated (core radius 10 times lower) than the luminous (optical/X-ray) matter. Extrapolating the current observational data, we estimate that there are over 100 giant luminous arcs (B <= 22.5 and axis ratio >= 10) over the whole sky. Our model also yields a distribution of the redshifts of the arc clusters peaking at z ~ 0.2-0.3, while most of the arc sources are expected at redshifts ranging from 0.5 to 1.3; both these results agree with the observational data. Using available lensing models to account for luminous arcs, we predict the existence of giant radio arcs, detectable in numbers ( ~100 down to 0.01 myJ) comparable to the estimated number of giant optical luminous arcs. Giant radio arcs might be a new class of objects, which could provide additional information on either the mass distribution of rich clusters or the redshift distribution of sub-mJy radio sources. Key words: galaxies: clustering - galaxies: general - gravitational lensing - radio continuum: galaxies.
Retrieve 16 NED objects in this reference.
Please click here for ADS abstract

Back to NED Home