Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..apr.k3001w&link_type=abstract
American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As
Astronomy and Astrophysics
Astrophysics
Scientific paper
I will present recent VLBA observations of the parsec-scale jet, counterjet and accretions disk of NGC 4261 (3C270). We attribute a gap in the brightness of the counterjet to free-free absorption by the accretion disk. Our VLBA observations allow us to monitor the location and depth of the gap and check for motions in the jet and counterjet. These observations span a time of order that required for orbiting material in the disk to transit the counterjet, so we are able to search for clumps in the disk by monitoring the optical depth of the gap. The optical depth of the gap is stable to within 20 percent over 5 years, corresponding to an electron density in the disk that is constant to within 10 percent. The radio structure of NGC 4261 will be contrasted with that of NGC 6251. I will compare the accretion disk of NGC 4261 with those of other nearby radio galaxies.
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