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arXiv 1208.0868astro-ph.COastro-ph.IM
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天体测量混响映射

Astrometric Reverberation Mapping

Yue Shen

摘要:

活动星系核(AGN)的空间扩展的发射区响应于连续谱的变化,如果这样的发射区由连续谱的能量再加工提供动力。来自混响区域的不同部分的响应在不同的时间到达,滞后于连续变化。滞后可用于映射发射区域的几何形状和运动学(即,混响映射,RM)。如果扩展的发射区域在配置和速度空间中不是球对称的,则混响可能在发射区域的光心中产生作为时间延迟和速度的函数的天体测量偏移,可以用未来的微弧秒到数十微弧秒的天体测量来检测。这种天体测量响应提供了对扩展发射区域的几何和运动学结构的独立约束,与传统的混响映射互补。此外,天体测量的RM是更敏感地推断一个扁平的几何形状的倾角和扩展的发射区的旋转角度。

英文摘要:

Spatially extended emission regions of Active Galactic Nuclei (AGN) respond to continuum variations, if such emission regions are powered by energy reprocessing of the continuum. The response from different parts of the reverberating region arrives at different times lagging behind the continuum variation. The lags can be used to map the geometry and kinematics of the emission region (i.e., reverberation mapping, RM). If the extended emission region is not spherically symmetric in configuration and velocity space, reverberation may produce astrometric offsets in the emission region photocenter as a function of time delay and velocity, detectable with future micro-arcsec to tens of micro-arcsec astrometry. Such astrometric responses provide independent constraints on the geometric and kinematic structure of the extended emission region, complementary to traditional reverberation mapping. In addition, astrometric RM is more sensitive to infer the inclination of a flattened geometry and the rotation angle of the extended emission region.

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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