High-resolution radio observations are presented of the flat-spectrum, 1-arcsec double radio source 1830- 211. Optical CCD imaging in the I-band shows an ~22 - mag object coincident with the radio source position. We find that the unique nature of 1830 - 211 may be understood in terms of gravitational imaging of a background compact flat-spectrum radio source by a foreground galaxy. A lensing model is presented for the compact as well as the extended emission features, and possible tests to confirm the lens hypothesis are outlined.
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- September 1990