The Hubble parameter - an upper limit from QSO 0957 + 561 A, B

Details The Hubble parameter - an upper limit from QSO 0957 + 561 A, B The Hubble parameter - an upper limit from QSO 0957 + 561 A, B

Dec 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...141..318b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 141, no. 2, Dec. 1984, p. 318-322. Sponsorship: Deutsche Forschungsgemeinschaf

Astronomy and Astrophysics

Astrophysics

42

Galactic Clusters, Gravitational Lenses, Hubble Constant, Quasars, Astronomical Models, Cosmology, Maxima, Time Lag

Scientific paper

An analytical discussion is conducted concerning the time delay due to a galaxy and cluster in general, approximating first the projected cluster mass distribution by a uniform density disk. Attention is then given to the gravitational field of the cluster, which is characterized in terms of three-parameter quadrupole shear as suggested by Falco et al. (1984). It is found that the additional time delay caused by a cluster depends on its focusing properties. For the case of the double quasar QSO 0957 + 561 A, B, the cluster contributes positively to the focusing.

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