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arXiv 1902.01657astro-ph.GA
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探测硬X射线选择巨射电星系的再启动活动

Probing restarting activity in hard X-ray selected giant radio galaxies

G. Bruni, F. Ursini, F. Panessa, L. Bassani, A. Bazzano, A. J. Bird, E. Chiaraluce, D. Dallacasa, M. Fiocchi, M. Giroletti, L. Hernandez-Garcia, A. Malizia, M. … 展开作者

G. Bruni, F. Ursini, F. Panessa, L. Bassani, A. Bazzano, A. J. Bird, E. Chiaraluce, D. Dallacasa, M. Fiocchi, M. Giroletti, L. Hernandez-Garcia, A. Malizia, M. Molina, L. Saripalli, P. Ubertini, T. Venturi

摘要:

巨型射电星系(GRG)的大小超过0.7 Mpc,是宇宙中最大的个体天体。到目前为止,它们为什么会达到如此巨大的延伸仍然不清楚。其中一种设想表明,它们是喷气式飞机活动多次发生的结果。将INTEGRAL+Swift AGN总体与射电目录(NVSS,FIRST,SUMSS)进行交叉相关,我们发现22%的源是GRG(比从射电目录中选择的源高4倍)。值得注意的是,80%的样本显示出重新开始无线电活动的迹象。X射线的性质与这种情况是一致的,源是在一个高吸积,高亮度的状态相对于以前的活动负责无线电波瓣。

英文摘要:

With their sizes larger than 0.7 Mpc, Giant Radio Galaxies (GRGs) are the largest individual objects in the Universe. To date, the reason why they reach such enormous extensions is still unclear. One of the proposed scenarios suggests that they are the result of multiple episodes of jet activity. Cross-correlating the INTEGRAL+Swift AGN population with radio catalogues (NVSS, FIRST, SUMSS), we found that 22% of the sources are GRG (a factor four higher than those selected from radio catalogues). Remarkably, 80% of the sample shows signs of restarting radio activity. The X-ray properties are consistent with this scenario, the sources being in a high-accretion, high-luminosity state with respect to the previous activity responsible for the radio lobes.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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