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Akihiro Doi, Yasuhiro Murata, Nanako Mochizuki, Hiroshi Takeuchi, Keiichi Asada, Takayuki J. Hayashi, Hiroshi Nagai, Katsunori M. Shibata, Tomoaki Oyama, Takaaki Jike, Kenta Fujisawa, Koichiro Sugiyama, Hideo Ogawa, Kimihiro Kimura, Mareki Honma, Hideyuki Kobayashi, Shoka Koyama, Multifrequency VLBI Observations of the Broad Absorption Line Quasar J1020 4320: Recently Restarted Jet Activity?, Publications of the Astronomical Society of Japan, Volume 65, Issue 3, 25 June 2013, 57, https://doi.org/10.1093/pasj/65.3.57
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Abstract
This paper reports on very-long-baseline interferometry observations of the radio-loud broad absorption line (BAL) quasar J1020|$ +$| 4320 at 1.7, 2.3, 6.7, and 8.4 GHz using the Japanese VLBI network (JVN) and European VLBI network (EVN). The radio morphology is compact with a size of |$ \sim$| 10 pc. The convex radio spectrum has been stable over the last decade; an observed peak frequency of 3.2 GHz is equivalent to 9.5 GHz in the rest frame, suggesting an age on the order of |$ \sim$| 100 years as a radio source, according to an observed correlation between the linear size and the peak frequency of compact steep spectrum (CSS) and giga-hertz peaked spectrum (GPS) radio sources. A low-frequency radio excess suggests a relic of past jet activity. J1020|$ +$| 4320 may be one of the quasars with recurrent and short-lived jet activity during a BAL-outflowing phase.