The Expanding Radio Lobe of 3C 84 Revealed by VSOP Observations
The Expanding Radio Lobe of 3C 84 Revealed by VSOP Observations
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DOI：
10.1093/pasj/58.2.261
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发表时间：
2006-04
影响因子：
2.3
通讯作者：
K. Asada;S. Kameno;Zhi-qiang Shen;S. Horiuchi;D. Gabuzda;M. Inoue
中科院分区：
文献类型：
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作者：
K. Asada;S. Kameno;Zhi-qiang Shen;S. Horiuchi;D. Gabuzda;M. Inoue
用VSOP观测观测到了NGC1275中与明亮射电源3C84有关的年轻射电叶的膨胀和内部自行。这些自行与经典双射电源的演化情景是一致的。视膨胀速度为(0.50±-0.09)c。2001年射电波瓣的年龄估计为(45.7±-8.9)岁，与Romney等人先前估计的年龄一致。(1982)。5 GHz总磁通密度在50年代末S出现增加，在80年代中期出现几个峰值，目前正处于衰变阶段。总通量密度的衰减可以自然地用射电叶膨胀引起的绝热冷却来解释，以前测量的频谱指数表明发射来自射电叶表面。
The expansion and inner proper motions of a young radio lobe associated with the bright radio source 3C 84 in the Seyfert galaxy NGC 1275 have been detected by VSOP observations. These proper motions are consistent with the evolution scenario of classical double radio sources. The apparent expansion velocity is (0.50 +/- 0.09) c. The age of the radio lobe is estimated to be (45.7 +/- 8.9) yr in 2001, which is in agreement with the age previously estimated by Romney et al. (1982). The total flux density at 5 GHz increased at the end of the 1950's, marked several peaks in the middle of: the 1980's, and is presently in a decay phase. The decay of the total flux density can naturally be explained by an adiabatic cooling due to expansion of the radio lobe, and previously measured spectral indices Suggest that the emission comes from the surface of the radio lobe.