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arXiv 2302.08402astro-ph.GA
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MCG 08-11-011 的连续谱反响映射

Continuum reverberation mapping of MCG 08-11-011

C. Fian, D. Chelouche, S. Kaspi, C. Sobrino Figaredo, T. Lewis, S. Catalan

AI总结:

本文通过 Wise 天文台多波段测光反响映射测量 MCG 08-11-011 的连续谱时间延迟,发现其尺寸-波长关系显著陡于标准薄盘理论预测,为吸积盘结构研究提供新观测约束。

摘要:

我们报告了 2019 年至 2020 年利用 Wise 天文台 C18 望远镜开展的一项测光反响映射活动的结果,该活动以活动星系核(AGN)MCG 08-11-011 为目标。监测以每天一次的频率进行,使用专门设计的窄带滤光片,波长范围从光学到近红外(约 4000 至 8000 Å),并避开显著的宽发射线。我们旨在测量波段间连续谱时间延迟,确定尺寸-波长关系,并估算该系统扣除寄主星系贡献后的 AGN 光度。我们使用点扩散函数测光来提取连续谱光变曲线,并采用多种方法测量波段间时间延迟,包括插值互相关函数、z 变换离散相关函数、von Neumann 估计器、JAVELIN(光谱模式和测光模式)、MICA 以及多元相关函数。我们发现 MCG 08-11-011 的多波段光变曲线之间存在随波长变化的延迟 τ(λ),最大可达约 7 天。观测到的延迟比基于标准薄盘理论的预测值大约 3–7 倍。我们辨别出尺寸-波长关系(τ ∝ λ^{4.74})显著陡于几何薄且光学厚吸积盘所预期的 τ ∝ λ^{4/3},这可能源于弥散连续谱辐射对通量的贡献。这些结果与先前连续谱反响映射活动所发现的结果相似。

英文摘要:

We report the results from a photometric reverberation mapping campaign carried out with the C18 telescope at the Wise Observatory from 2019 to 2020, targeting the active galactic nucleus (AGN) MCG 08-11-011. The monitoring was conducted on a daily basis with specially designed narrow-band filters, spanning from optical to near-infrared wavelengths ($\sim4000$ to $8000$Å) and avoiding prominent broad emission lines. We aim to measure inter-band continuum time lags, determine the size-wavelength relation, and estimate the host-subtracted AGN luminosity for this system. We used the point-spread function photometry to extract the continuum light curves and measure the inter-band time lags using several methods, including the interpolated cross-correlation function, the z-transformed discrete correlation function, a von Neumann estimator, JAVELIN (in spectroscopic and photometric mode), MICA, and a multivariate correlation function. We find wavelength-dependent lags, $τ(λ)$, up to $\sim$7 days between the multiband light curves of MCG 08-11-011. The observed lags are larger than predictions based on standard thin-disk theory by a factor of $\sim3-7$. We discern a significantly steeper ($τ\propto λ^{4.74}$) size-wavelength relation than the $τ\propto λ^{4/3}$ expected for a geometrically thin and optically thick accretion disk, which may result from the contribution of diffuse continuum emission to the flux. These results are similar to those found by previous continuum reverberation mapping campaigns.

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