Radio astronomy in silhouette: the nucleus of radio galaxies revealed via free-free absorption

Details Radio astronomy in silhouette: the nucleus of radio galaxies revealed via free-free absorption Radio astronomy in silhouette: the nucleus of radio galaxies revealed via free-free absorption

Jan 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001asthe..94...20k&link_type=abstract

The Astronomical Herald (ISSN 0374-2466), Vol. 94, No. 1, p. 20 - 27 (2001)

Astronomy and Astrophysics

Astronomy

Radio Astronomy, Radio Galaxies: Nuclei

Scientific paper

Modern Very-Long-Baseline Interferometers (VLBI) such as the VSOP (VLBI Space Observatory Programme) and the VLBA (VLB Array) unveiled distributions of cold dense plasma, which was sensed via free-free absorption process, in the parsec-scale vicinity of active galaxies. A VSOP observation of the GHz-Peaked Spektrum (GPS) source OQ 208 shows that the double lobe with a 10-pc separation is enshrouded with a cold dense plasma. At the center of an active galaxy NGC 1052, a 0.7 pc plasma torus is discovered by trichromatic VLBA observations. These results demonstrate significance of the free-free absorption as a probe of evolution and environment of young radio galaxies.

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