Galaxy mass deduced from the structure of Einstein ring MG1654 + 1346

Details Galaxy mass deduced from the structure of Einstein ring MG1654 + 1346 Galaxy mass deduced from the structure of Einstein ring MG1654 + 1346

Mar 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990natur.344...43l&link_type=abstract

Nature (ISSN 0028-0836), vol. 344, March 1, 1990, p. 43-45. Research supported by NSF and National Research Council.

Astronomy and Astrophysics

Astronomy

25

Galactic Mass, Galactic Structure, Quasars, Astronomical Models, Elliptical Galaxies, Gravitational Lenses, Luminosity, Radio Emission, Radio Interferometers

Scientific paper

High-resolution radiointerferometric observations of MG1654 + 1346, a radio quasar in near-perfect alignment with an elliptical galaxy have been made. It is shown that radio emission is distorted into a narrow Einstein ring that lies within a diamond-shaped region bounded by caustic lines. From the details of the ring structure, a new model for the lensing geometry is deduced which leads to a more accurate estimate of the mass of the lensing galaxy.

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