The mass of the galaxy lensing Q0957 + 561 - Limits on H0

Details The mass of the galaxy lensing Q0957 + 561 - Limits on H0 The mass of the galaxy lensing Q0957 + 561 - Limits on H0

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aipc..222..459r&link_type=abstract

In: After the first three minutes; Proceedings of the 1st Astrophysics Workshop, Univ. of Maryland, College Park, Oct. 15-17, 19

Astronomy and Astrophysics

Astrophysics

Elliptical Galaxies, Galactic Clusters, Galactic Mass, Gravitational Lenses, Quasars, Astronomical Models, Astronomical Spectroscopy, Hubble Constant, Image Analysis

Scientific paper

The double quasar Q0957 + 561 A B is believed to be a gravitational lens image formed by a galaxy at z = 0.36 (Young et al., 1979). The object is a single QSO at z = 1.41 with a double image produced by the intervening galaxy. Deep images taken by Young et al., reveal a rich cluster of galaxies whose brightest member is nearly superposed on Q0957 + 561B. Vanderriest et al., 1989, have been monitoring the flux from the images A and B of the lensed quasar. A time delay between the two images has been obtained with a highly significant correlation peak. Falco et al. (1985) have presented a two-component model for the lens where the components approximate the bending due to the elliptical galaxy plus a cluster. Their analysis shows that the one-dimensional velocity dispersion of the elliptical galaxy and the time delay can be used to constrain the value of H0. In the present work, the velocity dispersion of the galaxy lensing Q0957 + 561 was measured, and this measurement and the corresponding bounds on H0 are reported.

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