Multifrequency VLBI Observations of the Broad Absorption Line Quasar J1020+4320: Recently Restarted Jet Activity?

作者：Doi Akihiro^*; Murata Yasuhiro; Mochizuki Nanako; Takeuchi Hiroshi; Asada Keiichi; Hayashi Takayuki J; Nagai Hiroshi; Shibata Katsunori M; Oyama Tomoaki; Jike Takaaki; Fujisawa Kenta; Sugiyama Koichiro; Ogawa Hideo; Kimura Kimihiro; Honma Mareki; Kobayashi Hideyuki; Koyama Shoko

来源：Publications of the Astronomical Society of Japan, 2013, 65(3): 57.

DOI：10.1093/pasj/65.3.57

• galaxies: active
• galaxies: jets
• galaxies: quasars: absorption lines
• galaxies: quasars: individual (SDSS J102027.20+432056.2)
• radio continuum: galaxies

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 similar to 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 similar to 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.

• 出版日期2013-6-25
• 单位中国科学院国家天文台