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arXiv 2109.05036astro-ph.GA
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从ZTF调查中选出的AGN的连续混响映射中的吸积盘尺寸

Accretion Disk Sizes from Continuum Reverberation Mapping of AGN Selected from the ZTF Survey

Vivek Kumar Jha, Ravi Joshi, Hum Chand, Xue-Bing Wu, Luis C. Ho, Shantanu Rastogi, Qinchun Ma

摘要:

利用Zwicky瞬变观测中获得的光学$g$、$r$和$i$波段光变曲线,对19个活动星系核(AGN)的吸积盘大小进行了估算.所有的活动星系核都有可靠的超大质量黑洞(SMBH)质量的估计基于以前的混响映射测量。多波段光变曲线是互相关的,并且混响滞后使用插值互相关函数(ICCF)方法和使用{ \sc javelin}代码的贝叶斯方法来估计。正如磁盘再处理参数所预期的那样,该示例的$g-r$频带滞后比$g-i$频带滞后短。所有的带间滞后,但5个来源,是大于从标准的Shakura Sunyaev(SS)分析模型预测的大小。我们使用{ \sc javelin}程序实现的薄盘模型直接拟合光变曲线,得到吸积盘的大小。使用该模型获得的磁盘大小平均比基于SS磁盘模型的预测大3.9倍。我们发现,磁盘的大小和已知的物理参数,即光度和SMBH质量之间的弱相关性。在不久的将来,从大型光度测量中获得的涵盖更大范围光度和SMBH质量的活动星系核大样本将有助于更好地了解吸积盘的结构和物理。

英文摘要:

We present the accretion disk size estimates for a sample of 19 active galactic nuclei (AGN) using the optical $g$, $r$, and $i$ band light curves obtained from the Zwicky Transient Facility (ZTF) survey. All the AGN have reliable supermassive black hole (SMBH) mass estimates based on previous reverberation mapping measurements. The multi-band light curves are cross-correlated, and the reverberation lag is estimated using the Interpolated Cross-Correlation Function (ICCF) method and the Bayesian method using the {\sc javelin} code. As expected from the disk reprocessing arguments, the $g-r$ band lags are shorter than the $g-i$ band lags for this sample. The interband lags for all, but 5 sources, are larger than the sizes predicted from the standard Shakura Sunyaev (SS) analytical model. We fit the light curves directly using a thin disk model implemented through the {\sc javelin} code to get the accretion disk sizes. The disk sizes obtained using this model are on an average 3.9 times larger than the prediction based on the SS disk model. We find a weak correlation between the disk sizes and the known physical parameters, namely, the luminosity and the SMBH mass. In the near future, a large sample of AGN covering broader ranges of luminosity and SMBH mass from large photometric surveys would be helpful in a better understanding of the structure and physics of the accretion disk.

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