Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aprs.conf...91m&link_type=abstract
Astrophysical Phenomena Revealed by Space VLBI, Proceedings of the VSOP Symposium, held at the Institute of Space and astronauti
Astronomy and Astrophysics
Astrophysics
3
Scientific paper
We have observed the gigahertz-peaked spectrum source 0108+388 with the VLBA at a range of frequencies above and below the spectral peak. The activity that dominates the radio emission from 0108+388, which is also classified as a Compact Symmetric Object, is thought to be less than 1000 years old. Here we present evidence for a disk of gas in the central tens of parsecs that causes free-free absorption at low frequencies and may have triggered the recent onset of radio frequency activity. The spectral index maps obtained from our observations reveal that the radio spectra of a large area of the map turn over at about the same frequency, indicating that the turnover is due to foreground free-free absorption, rather than synchrotron self-absorption. The morphologies of the spectral index maps further show that the absorbing material is non-uniform and is suggestive of an edge-on disk centered on the core of the active galaxy. A rough model of free-free absorption by a disk of gas that fits the observed opacity maps is obtained.
Crawford Fronefield III
Marr Jackson M.
Taylor Greg B.
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