The luminosity-dependent contribution from the broad-line region to the wavelength-dependent lags in Mrk 110
The luminosity-dependent contribution from the broad-line region to the wavelength-dependent lags in Mrk 110
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Mrk 110 中宽线区域的光度相关贡献与波长相关滞后
DOI：
10.1093/mnrasl/slac009
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发表时间：
2022
影响因子：
--
通讯作者：
Lobban, A.
中科院分区：
文献类型：
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作者：
Vincentelli, F. M.;McHardy, I.;Hernández Santisteban, J. V.;Cackett, E. M.;Gelbord, J.;Horne, Keith;Miller, J. A.;Lobban, A.
在 2019 年 2 月和 9 月的两次密集监测活动中，我们测量了高吸积率 (AGN) Mrk 110 中 X 射线、紫外线和光学波段之间与波长相关的滞后。在纳入 Vincentelli 等人发布的 2017 年数据后，我们将观测结果分为三个具有不同 X 射线光度的区间。第一个间隔具有最低的 X 射线光度，并且没有表现出大多数 AGN 中出现的 U 波段过量正滞后或 X 射线过量负滞后。然而，在随后的两个更高 X 射线光度的间隔中可以看到这些过度的滞后。尽管数据有限，但过多的滞后似乎与 X 射线光度成比例。我们的模型表明，随着光度的增加，吸积盘对 X 射线再处理的预期滞后几乎没有变化。因此，由于 U 波段过剩几乎肯定是由宽线区 (BLR) 的巴尔默连续谱发射引起的，因此我们将这些滞后变化归因于 BLR 贡献的变化。这种变化很容易解释为随着电离光度的增加，BLR 的内半径通常会增加。
We have measured the wavelength-dependent lags between the X-ray, ultraviolet, and optical bands in the high-accretion rate () active galactic nucleus (AGN) Mrk 110 during two intensive monitoring campaigns in February and September 2019. After including the 2017 data published by Vincentelli et al., we divided the observations into three intervals with different X-ray luminosities. The first interval has the lowest X-ray luminosity and did not exhibit theU-band excess positive lag, or the X-ray excess negative lag that is seen in most AGNs. However, these excess lags are seen in the two subsequent intervals of higher X-ray luminosity. Although the data are limited, the excess lags appear to scale with X-ray luminosity. Our modelling shows that lags expected from reprocessing of X-rays by the accretion disc vary hardly at all with increasing luminosity. Therefore, as theU-band excess almost certainly arises from Balmer-continuum emission from the broad-line region (BLR), we attribute these lag changes to changes in the contribution from the BLR. The change is easily explained by the usual increase in the inner radius of the BLR with increasing ionizing luminosity.