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arXiv 2302.09370astro-ph.GAastro-ph.HE
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检验超大质量黑洞的超爱丁顿吸积:PG 1119+120的反响映射

Testing Super-Eddington Accretion onto a Supermassive Black Hole: Reverberation Mapping of PG 1119+120

Fergus R. Donnan, Juan V. Hernández Santisteban, Keith Horne, Chen Hu, Pu Du, Yan-Rong Li, Ming Xiao, Luis C. Ho, Jesús Aceituno, Jian-Min Wang, Wei-Jian Guo, S… 展开作者

Fergus R. Donnan, Juan V. Hernández Santisteban, Keith Horne, Chen Hu, Pu Du, Yan-Rong Li, Ming Xiao, Luis C. Ho, Jesús Aceituno, Jian-Min Wang, Wei-Jian Guo, Sen Yang, Bo-Wei Jiang, Zhu-Heng Yao

AI总结:

本研究通过光谱和测光监测对类星体PG 1119+120进行反响映射,测得黑洞质量并分析其吸积流光变,发现其吸积呈超爱丁顿特征,观测结果与slim disc模型高度一致。

摘要:

我们测量了黑洞质量并研究了本地(z=0.0502)类星体PG 1119+120周围的吸积流。利用Calar Alto进行的光谱监测提供了Hβ延迟和谱线宽度,据此我们估计黑洞质量为log(M•/M☉)=7.0,不确定性约为0.4 dex。利用Las Cumbres Observatory进行的两年高频光度监测提供了7个光学波段的测光光变曲线,适用于密集的连续谱反响映射。我们识别出两种时间尺度上的光变。在100天时间尺度上的较慢光变在u'波段表现出额外流量和延迟增加,因此可归因于宽线区的弥漫束缚自由连续谱发射。我们归因于吸积盘再处理的较快光变则缺乏u'波段额外流量,其流量和延迟谱与τ∝λ^(4/3)(符合薄吸积盘T(R)∝R^(-3/4)温度结构的预期)或τ∝λ^2(符合slim disc的预期)相一致。将流量分解为可变(吸积盘)和恒定(宿主星系)成分后,我们发现吸积盘SED比预期更平,表现为fν~const。对SED建模预测爱丁顿比λ_Edd>1,其中平坦光谱可以由几乎没有尘埃消光的slim disc重现,或者由需要更多尘埃消光的薄吸积盘重现。尽管该吸积是超爱丁顿的,但其几何结构仍不清楚,然而在这些吸积率下高辐射压预期会形成slim disc,这与我们的观测完全一致。

英文摘要:

We measure the black hole mass and investigate the accretion flow around the local ($z=0.0502$) quasar PG 1119+120. Spectroscopic monitoring with Calar Alto provides H$β$ lags and linewidths from which we estimate a black hole mass of $\log \left(M_{\bullet}/\mathrm{M}_{\odot} \right) = 7.0$, uncertain by $\sim0.4$ dex. High cadence photometric monitoring over two years with the Las Cumbres Observatory provides lightcurves in 7 optical bands suitable for intensive continuum reverberation mapping. We identify variability on two timescales. Slower variations on a 100-day timescale exhibit excess flux and increased lag in the $u'$ band and are thus attributable to diffuse bound-free continuum emission from the broad line region. Faster variations that we attribute to accretion disc reprocessing lack a $u'$-band excess and have flux and delay spectra consistent with either $τ\propto λ^{4/3}$, as expected for a temperature structure of $T(R) \propto R^{-3/4}$ for a thin accretion disc, or $τ\propto λ^{2}$ expected for a slim disc. Decomposing the flux into variable (disc) and constant (host galaxy) components, we find the disc SED to be flatter than expected with $f_ν \sim \rm{const}$. Modelling the SED predicts an Eddington ratio of $λ_{\rm Edd} > 1$, where the flat spectrum can be reproduced by a slim disc with little dust extinction or a thin disc which requires more dust extinction. While this accretion is super-Eddington, the geometry is still unclear, however a slim disc is expected due to the high radiation pressure at these accretion rates, and is entirely consistent with our observations.

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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