Physics
Scientific paper
Jan 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001iaus..205..144s&link_type=abstract
Galaxies and their Constituents at the Highest Angular Resolutions, Proceedings of IAU Symposium #205, held 15-18 August 2000 at
Physics
1
Scientific paper
Powerful radio jets from active galactic nuclei (AGNs) are one of the most energetic events in the universe because the total energy of typical radio jets amounts to ~ 1060 ergs. Although the huge energy of the radio jets is thought to be powered either by gas accretion onto a central, supermassive black hole or by release of the rotational energy of the hole, the genesis of powerful radio jets has not yet been fully understood. The best way toward understanding the radio jets appears to observe the very inner region close to the central engine. Mapping the central 10 pc region of the nearby radio galaxy NGC 6251 with a 0.2 pc resolution using very long baseline radio interferometer (VLBI) at two radio frequencies, 5 GHz and 15 GHz, we have found the sub-parsec-scale counterjet for the first time in this radio galaxy. This discovery allows us to investigate the jet acceleration based on the relativistic beaming model. This provides an evidence for the sub-parsec-scale acceleration of the radio jet in powerful radio galaxies.
Inoue Makoto
Kaburaki Osamu
Kameno Seiji
Ohyama Yoichi
Sasao Tetsuo
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