Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991acaps..10..306s&link_type=abstract
(Acta Astrophysica Sinica, vol. 10, no. 4, 1990, p. 306-310, 312-314) Chinese Astronomy and Astrophysics (ISSN 0275-1062), vol.
Astronomy and Astrophysics
Astronomy
Active Galactic Nuclei, Extragalactic Radio Sources, Quasars, Radio Galaxies, Radio Jets (Astronomy), Stellar Cores, Charge Coupled Devices, Radio Telescopes, Statistical Analysis
Scientific paper
A rapid brightening in the core of 3C 120 was observed in the I and R bands using a 1-m telescope fitted with a CCD. The mean brightening rate was faster than 0.7 mag/d, with short, bright emission features appearing around the core in the early stage of the brightening. Observations were also made of PKS 0349-27, 3C 98, and PKS 0634-20. It was found that protrusions on the outer edge of PKS 0349-27 tend to incline in the clockwise direction and that the extensions of 3C 98 and PKS 0634-20 extend in the northwest and north-south (mainly north) directions, respectively.
Li Zhi-Ping
Sun Kai
Zhang Wen-Yuan
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