NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-18 T06:01:08 PDT
Help | Comment | NED Home

For refcode 1988AJ.....95..999C:
Retrieve 265 NED objects in this reference.
Please click here for ADS abstract

NED Abstract

Copyright by American Astronomical Society. Reproduced by permission
1988AJ.....95..999C LINEAR CLUSTERS OF GALAXIES: A194 G. N. F CHAPMAN, M. J. GELLER, AND J. P. HUCHRA Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts 01238-1205 Received 8 September 1987; revised 7 December 1987 ABSTRACT We have measured 160 new redshifts for galaxies within 5^deg^ of A194: we list these along with 108 other redshifts in this field. A194 is a "linear" cluster according to Rood and Sastry (1971) and Struble and Rood (1982, 1984). With 74 cluster members, we can show that the galaxy distribution in A194 is inconsistent with a spherically symmetric King model, even though the model provides a good fit to the azimuthally averaged distribution. The cluster has a well-defined axis. From the virial theorem, we find that the mass-to-light ratio of A194 is M/L_B_ = 190 h M_sun_/L_sun_, lower than the mean M/L_B_ ~ 340 for groups in the CfA redshift survey (Huchra and Geller 1982; Geller 1984) and similar to the values obtained for two other linear clusters (A999 and A1016; Chapman, Geller, and Huchra 1987). We propose a nonparametric test for galaxy- cluster alignment. We use this test along with a {chi}^2^ test to search for alignment (or antialignment) of galaxy major axes with the axis of A194. The data are consistent with isotropy. We find no evidence for luminosity segregation, or for significant differences in the velocity or surface distributions of galaxies as a function of morphological type. If the "pancake" model for cluster formation is correct, it is surprising that a flattened system like A194 shows no sign of the predicted galaxy alignments. We use H_0_ = 100 km s^-1^ Mpc^-1^ throughout.
Retrieve 265 NED objects in this reference.
Please click here for ADS abstract

Back to NED Home