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arXiv 2109.02189astro-ph.GA
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复合星系SDSS J103911-000057的长期变率:真正的2型AGN的候选者

Long-term variability of the composite galaxy SDSS J103911-000057: A candidate of true Type-2 AGN

XueGuang Zhang, YingFei Zhang, PeiZhen Cheng, BaoHan Wang, YiLi Lv, HaiChao Yu

摘要:

在手稿中,复合星系SDSS J103911-000057(=SDSS J1039)被认为是真正的2型活动星系核的更好候选者,没有隐藏的BLR。在SDSS J1039中没有检测到宽发射线,而仅检测到窄发射线,这可以通过F检验技术和EW小于13.5nm的预期宽发射线(99%置信水平)得到很好的证实。同时,在SDSS J1039中,可信度高于7sigma的活动星系核幂律分量是首选。此外,SDSS J1039的长期变化可以很好地描述的DRW过程的内在变化的时间尺度$τ\sim100{\rm days}$,类似于正常的类星体。并且,根据SDSS J1039中BH质量的msig关系,以及活动星系核连续发光度与H $α$总发光度的相关性,在对BLR的Virialization假设下,如果存在预期的宽H $α$,则可以重建出线宽约为$300-1000{\rm km~s^{-1}}$,线通量约为$666\times10^{-17}{\rm erg~s^{-1}~cm^{-2}}$的宽H $α$。提供了强有力的证据来拒绝内在可能的宽H $α$被SDSS J1039中的SDSS频谱的噪声淹没的可能性。此外,SDSS J1039的[O~{ \sc iii}]线光度与连续光度之间的相关性与正常宽线活动星系核的一致,表明SDSS J1039被归类为暗态的变貌活动星系核的可能性被很好地排除。因此,根据目前的知识,SDSS J1039是真正的2型活动星系核的更好候选者。

英文摘要:

In the manuscript, the composite galaxy SDSS J103911-000057 (=SDSS J1039) is reported as a better candidate of true Type-2 AGN without hidden BLRs. None broad but only narrow emission lines detected in SDSS J1039 can be well confirmed both by the F-test technique and by the expected broad emission lines with EW smaller than 13.5Å~ with 99\% confidence level. Meanwhile, a reliable AGN power law component is preferred with confidence level higher than 7sigma in SDSS J1039. Furthermore, the long-term variability of SDSS J1039 from CSS can be well described by the DRW process with intrinsic variability timescale $τ\sim100{\rm days}$, similar as normal quasars. And, based on BH mass in SDSS J1039 through the msig relation and on the correlation between AGN continuum luminosity and total H$α$ luminosity, the expected broad H$α$, if there was, could be re-constructed with line width about $300-1000{\rm km~s^{-1}}$ and with line flux about $666\times10^{-17}{\rm erg~s^{-1}~cm^{-2}}$ under the Virialization assumption to BLRs, providing robust evidence to reject the probability that the intrinsic probable broad H$α$ were overwhelmed by noises of the SDSS spectrum in SDSS J1039. Moreover, the SDSS J1039 does follow the same correlation between continuum luminosity and [O~{\sc iii}] line luminosity as the one for normal broad line AGN, indicating SDSS J1039 classified as a changing-look AGN at dim state can be well ruled out. Therefore, under the current knowledge, SDSS J1039 is a better candidate of true Type-2 AGN.

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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