Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...291..411a&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 291, no. 2, p. 411-419
Astronomy and Astrophysics
Astrophysics
31
Elliptical Galaxies, Galactic Clusters, Gravitational Lenses, Quasars, Stellar Spectrophotometry, Data Processing, Distance, Hubble Constant, Red Shift
Scientific paper
Redshift measurements for 38 objects as well as VRI photometric data for approximately 200 objects have been obtained in the field of the multiply imaged QSO 0957+561. The data analysis leads to the identification of a cluster at average z = 0.355 surrounding the central lens galaxy G1, with a velocity dispersion 715 + or - 130 km/s. This cluster is identified as a poor to medium-rich cluster, dominated by a giant elliptical galaxy (G1), and with a large fraction of late type galaxies. Another group or cluster, located at about 2 min from G1 and centered on G5, is identified at a redshift of 0.5, in accordance with previous results. The high degree of contamination along the line-of-sight is also examined. The consequences of these observational results for the modeling of the lens and the evaluation of the Hubble constant H0 are briefly discussed.
Angonin-Willaime Marie-Christine
Soucail Genevieve
Vanderriest Ch.
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