Redshift measurements of the brightest cluster galaxies of the gravitational lens 0957 + 561

Details Redshift measurements of the brightest cluster galaxies of the gravitational lens 0957 + 561 Redshift measurements of the brightest cluster galaxies of the gravitational lens 0957 + 561

Feb 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.254p..27g&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 254, Feb. 1, 1992, p. 27P-31P.

Astronomy and Astrophysics

Astronomy

28

Galactic Clusters, Gravitational Lenses, Red Shift, Astronomical Spectroscopy, Cross Correlation, Data Acquisition, Galactic Mass, Luminosity

Scientific paper

The results of a spectroscopic survey of the brightest objects in a field centered on the gravitational lens system 0957 + 561 are presented. Redshift measurements have been used to separate field galaxies from members of the lensing cluster at z = 0.355, allowing the determination of a luminosity-weighted center for the cluster and a tentative value for its radial velocity dispersion of about 550 km/s. These data also provide evidence that there may be an additional group or cluster of galaxies at z = 0.503.

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