A technique for using radio jets as extended gravitational lensing probes

Details A technique for using radio jets as extended gravitational lensing probes A technique for using radio jets as extended gravitational lensing probes

Jan 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...367l...1k&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 367, Jan. 20, 1991, p. L1-L4. Research supported by NSERC.

Astronomy and Astrophysics

Astronomy

21

Galactic Mass, Gravitational Lenses, Mass To Light Ratios, Radio Jets (Astronomy), Dark Matter, Magnetohydrodynamic Waves, Quasars, Radio Sources (Astronomy), Red Shift

Scientific paper

A new and potentially powerful method of measuring the mass of a galaxy (or dark matter concentration) which lies close in position to a background polarized radio jet is proposed. Using the fact that the polarization angle is not changed by lensing, an 'alignment-breaking parameter' is defined which is a sensitive indicator of gravitational distortion. The method remains sensitive over a wide redshift range of the gravitational lens. This technique is applied to the analysis of polarimetric observations of the jet of 3C 9 at z = 2.012, combined with a newly discovered 20.3 mag foreground galaxy at z = 0.2538 to 'weigh' the galaxy and obtain an approximate upper limit to the mass-to-light ratio.

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