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arXiv 2202.07199astro-ph.GA
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活动星系核的射电二分法

The radio dichotomy of active galactic nuclei

Hubing Xiao, Jingtian Zhu, Liping Fu, Shaohua Zhang, Junhui Fan

摘要:

活动星系核的射电二分法问题虽然提出了四十多年,但至今仍存在争议。为了解决这个古老的谜团,我们收集了一个活动星系核的光$B$波段和射电6厘米波段的数据,分析了射电响度${\rm log}R$。我们的研究结果表明,射电强(RL)活动星系核和射电静(RQ)活动星系核之间的${\rm log}R = \langle 1.37 \pm 0.02 \rangle$分离,表明存在RL/RQ二分法。首次提出将射电光度和射电响度结合起来作为活动星系核的双判据,将活动星系核划分为RL和RQ,避免了单判据情况下可能出现的误分类问题,并利用机器学习方法提出了双判据分界线${\rm log}L_{\rm 6cm} = -2.7{\rm log}R +44.3$。另外,RL/RQ二分法的关键是两类射电辐射的起源,通过射电6 cm光度与光学$B$波段光度的相关性研究,我们认为RL和RQ的射电辐射起源相同,如喷流和小喷流(中止喷流或外流)。

英文摘要:

The question of radio dichotomy in the active galactic nuclei (AGNs) is still in debate even it has been proposed for more than forty years. In order to solve the old riddle, we collect a sample of AGNs with optical $B$ band and radio 6cm wavelength data to analyze the radio loudness ${\rm log}R$. Our results indicate a separation of ${\rm log}R = \langle 1.37 \pm 0.02 \rangle$ between radio-loud (RL) AGNs and radio-quiet (RQ) AGNs, suggest the existence of an RL/RQ dichotomy. For the first time, we suggest combining radio luminosity and radio loudness as a double-criterion to divide AGNs into RLs and RQs to avoid misclassification problems that may happen in the single-criterion scenario, we propose the double-criterion dividing line ${\rm log}L_{\rm 6cm} = -2.7{\rm log}R +44.3$ by using a machine learning method. In addition, the key point of the RL/RQ dichotomy is the origin of radio emission for the two classes, we suggest the radio emission from RLs and RQs share the same origin, e.g. jets and mini-jets (aborted-jet or outflow), through a correlation study between radio 6cm luminosity and optical $B$ band luminosity.

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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