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arXiv 2212.09161astro-ph.COastro-ph.HE
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为下一代大数据巡天建模测光反响映射数据。利用LSST确定类星体吸积盘大小

Modeling photometric reverberation mapping data for the next generation of big data surveys. Quasar accretion disks sizes with the LSST

F. Pozo Nuñez, C. Bruckmann, S. Desamutara, B. Czerny, S. Panda, A. P. Lobban, G. Pietrzyński, K. L. Polsterer

AI总结:

本研究开发了考虑LSST巡天特征的模拟,评估利用测光反响映射确定类星体吸积盘大小的精度,发现时间延迟恢复精度受采样间隔、红移等影响,且结果与黑洞质量一致。

摘要:

测光反响映射可以通过测量在不同连续谱波段观测到的光变曲线之间的时间延迟,来探测活动星系核中吸积盘(AD)的径向范围。量化时间延迟测量效率和精度的约束条件,对于恢复AD的大小-光度关系以及潜在地将类星体作为标准烛光具有重要意义。我们探索了利用下一代大数据巡天确定类星体AD大小的可能性。我们重点关注Vera C. Rubin天文台的时空遗产巡天(LSST),该项目将在其10年的运行期内,利用深 drilling 场观测数千颗类星体,并在六个宽带滤波器中为主巡天观测多达1000万颗类星体。我们开发了广泛的模拟,考虑了LSST巡天的特征和类星体的内禀属性。这些模拟用于表征光变曲线,并使用各种算法从中确定AD大小。我们发现,对于时间采样分别为2天和5天的光变曲线,时间延迟的恢复精度分别可达5%和15%。结果强烈依赖于源的红移以及发射线对滤光通道的相对贡献。假设一个光学厚且几何薄的AD,恢复的时间延迟谱与以30%不确定性导出的黑洞质量一致。

英文摘要:

Photometric reverberation mapping can detect the radial extent of the accretion disc (AD) in Active Galactic Nuclei by measuring the time delays between light curves observed in different continuum bands. Quantifying the constraints on the efficiency and accuracy of the delay measurements is important for recovering the AD size-luminosity relation, and potentially using quasars as standard candles. We have explored the possibility of determining the AD size of quasars using next-generation Big Data surveys. We focus on the Legacy Survey of Space and Time (LSST) at the Vera C. Rubin Observatory, which will observe several thousand quasars with the Deep Drilling Fields and up to 10 million quasars for the main survey in six broadband filter during its 10-year operational lifetime. We have developed extensive simulations that take into account the characteristics of the LSST survey and the intrinsic properties of the quasars. The simulations are used to characterise the light curves from which AD sizes are determined using various algorithms. We find that the time delays can be recovered with an accuracy of 5 and 15% for light curves with a time sampling of 2 and 5 days, respectively. The results depend strongly on the redshift of the source and the relative contribution of the emission lines to the bandpasses. Assuming an optically thick and geometrically thin AD, the recovered time-delay spectrum is consistent with black hole masses derived with 30% uncertainty.

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