揭开活动星系核冕线区的神秘面纱：用HST空间分辨光谱学
Demystifying the coronal line region of active galactic nuclei: spatially resolved spectroscopy with HST
摘要：
本文分析了10个Seyfert星系的STIS/HST光谱，旨在研究冕线区的结构和物理性质。STIS提供的高空间分辨率使我们能够解决问题并获得有关日冕线气体运动学的关键信息，直接测量其空间尺度，并研究驱动高电离线的机制。我们发现CLR的半径从几个秒差距（~10 pc）延伸到230 pc，与BLR和NLR之间起源的大量日冕线（CL）一致，并在[FeVII]和[NeV]线的情况下延伸到NLR。CL曲线随着到核的距离而强烈变化。我们在一些星系的核心观察到了谱线分裂。谱线的峰位移，包括红移和蓝移，通常达到500 km/s，在某些星系中甚至达到更高的速度（1000 km/s）。一般来说，CL遵循与[OIII]等低电离线相同的旋转曲线模式。从无线电和CL发射之间的直接比较，我们发现，无论是强度还是CL的运动学标度在任何明显的和强烈的方式与无线电喷流。此外，CL和低电离线的通量分布和运动学的相似性，气体的低温导出，以及光电离模型的成功再现，在几个因素内，所观察到的线比，指向光电离作为CL的主要驱动机制。
英文摘要：
We present an analysis of STIS/HST optical spectra of a sample of ten Seyfert galaxies aimed at studying the structure and physical properties of the coronal-line region (CLR). The high-spatial resolution provided by STIS allowed us to resolve the CLR and obtain key information about the kinematics of the coronal-line gas, measure directly its spatial scale, and study the mechanisms that drive the high-ionisation lines. We find CLRs extending from just a few parsecs (~10 pc) up to 230 pc in radius, consistent with the bulk of the coronal lines (CLs) originating between the BLR and NLR, and extending into the NLR in the case of [FeVII] and [NeV] lines. The CL profiles strongly vary with the distance to the nucleus. We observed line splitting in the core of some of the galaxies. Line peak shifts, both red- and blue-shifts, typically reached 500 km/s, and even higher velocities (1000 km/s) in some of the galaxies. In general, CLs follow the same pattern of rotation curves as low-ionisation lines like [OIII]. From a direct comparison between the radio and the CL emission we find that neither the strength nor the kinematics of the CLs scale in any obvious and strong way with the radio jets. Moreover, the similarity of the flux distributions and kinematics of the CLs and low-ionisation lines, the low temperatures derived for the gas, and the success of photoionisation models to reproduce, within a factor of few, the observed line ratios, point towards photoionisation as the main driving mechanism of CLs.
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