A central image of a gravitationally lensed quasar

Details A central image of a gravitationally lensed quasar A central image of a gravitationally lensed quasar

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aas...203.6804w&link_type=abstract

American Astronomical Society Meeting 203, #68.04; Bulletin of the American Astronomical Society, Vol. 35, p.1314

Astronomy and Astrophysics

Astronomy

Scientific paper

When a quasar is strongly lensed by a foreground galaxy, lens theory predicts that in many cases there should be a faint central image, corresponding to the central maximum in light-travel time. However, no central image has ever been securely identified, presumably due to extreme de-magnification by the large central densities of lens galaxies. We present the first secure identification of a central image, based on new and sensitive high-frequency radio observations of the lens system PMN J1632-0033. The properties of the central image place strong constraints on the mass distribution of the lens galaxy and an upper limit on the mass of its central black hole.

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