Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...20717009f&link_type=abstract
American Astronomical Society Meeting 207, #170.09; Bulletin of the American Astronomical Society, Vol. 37, p.1428
Astronomy and Astrophysics
Astronomy
Scientific paper
High angular resolution observations of two gravitational lens systems were obtained with the VLBA. The purpose of the observations was to search for millarcsecond-scale structure in the lensed images. We present the results of the observations of CLASS B2045+265 and CLASS B1608+656. We found precise positions for the lensed images in both systems as well as for the radio-loud lensing galaxy in the B2045+265 system. We also detect possible extended structure in the brightest lensed image in the B2045+265 system, but the remaining images appear to be unresolved. The B1608+656 system was observed at four frequencies, 1.6, 5.0, 8.4 and 15.0 GHz, allowing us to determine the spectra of the lensed images. In contrast, the B2045+265 system was only observed at 5.0 GHz. The new data will be incorporated into improved models of the lens mass distribution in the two systems.
Fassnacht Chris D.
Flack C. E.
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