Time delay in the Einstein ring PKS 1830-211

Details Time delay in the Einstein ring PKS 1830-211 Time delay in the Einstein ring PKS 1830-211

May 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...444..561v&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 444, no. 2, p. 561-566

Astronomy and Astrophysics

Astronomy

33

Gravitational Lenses, Image Processing, Radio Astronomy, Time Lag, Calibrating, Flux Density, Galactic Mass, Mass Distribution, Red Shift, Very Large Array (Vla)

Scientific paper

We present radio observations of the gravitational lens PKS 1830-211 at 8.4 and 15 GHz acquired using the Very Large Array. The observations were made over a 13 month period. Significant flux density changes over this period provide strong constraints on the time delay between the two lensed images and suffest a value of 44 +/- 9 days. This offers new direct evidence that this source is indeed a gravitational lens. The lens distance is dependent upon the model chosen, but reasonable limits on the mass of the lensing galaxy suggest that it is unlikely to be at a redshift less than a few tenths, and may well be significantly more distant.

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