Systematic effects in lens inversions - Aleph(1) exact models for 0957 + 561

Details Systematic effects in lens inversions - Aleph(1) exact models for 0957 + 561 Systematic effects in lens inversions - Aleph(1) exact models for 0957 + 561

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...382...58k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 382, Nov. 20, 1991, p. 58-70. Research supported by University of Californi

Statistics

Computation

55

Computational Astrophysics, Gravitational Lenses, Astronomical Models, Elliptical Galaxies, Galactic Structure, Hubble Constant

Scientific paper

The systematic variations between models for the gravitational lens potential that satisfy the constraints exactly are presented. The systematic variations between the models allow for a range of time delays from approximately 0.1/h to 1.0/h yr for a fixed Einstein-de Sitter cosmology if the galaxy and the cluster satisfy the velocity dispersion constraints of sigma (g) in the range 240-320 km/s and sigma(c) in the range 500-1500 km/s, and the center of the cluster lies within 30 arcsec of the galaxy. Given the formal value for the velocity dispersion (303 +/-50 km/s) and the measured time delay (1.3 +/-0.1 yr), it is found that h is not greater than 0.6 +/-0.2, considering only the observational errors in the velocity dispersion.

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