A gravitationally-lensed ring in MG 1549 + 3047

Details A gravitationally-lensed ring in MG 1549 + 3047 A gravitationally-lensed ring in MG 1549 + 3047

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....105..847l&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 105, no. 3, p. 847-852.

Astronomy and Astrophysics

Astronomy

40

Elliptical Galaxies, Gravitational Lenses, Mass Distribution, Mass To Light Ratios, Radio Sources (Astronomy), Red Shift, Charge Coupled Devices, Radio Galaxies, Very Large Array (Vla)

Scientific paper

We report the discovery of a new gravitational lens in the radio source MG 1549 + 3047. The source has a compact core and two lobes, with a faint optical counterpart to the core. The brighter lobe is shaped like a ring, and centered on a foreground galaxy with known redshift. The radio structure of the ring can be reproduced by distorting a typical radio lobe through a simple elliptical gravitational lensing potential, which models the mass distribution in the foreground galaxy. From a preliminary lens model, we show that the mass distribution follows the observed luminosity, and we predict a central velocity dispersion of about 230 km/sec. This corresponds to a blue mass-to-light ratio of about 18h solar units. The lens appears to be an ordinary elliptical galaxy, and the many multiply-imaged structures make MG 1549 + 3047 well-suited to directly determine its mass distribution.

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