Supersonic gas motion in giant extragalactic Hii regions
Supersonic gas motion in giant extragalactic Hii regions
复制标题
巨大河外 Hii 区域的超音速气体运动
DOI：
10.1046/j.1365-8711.1999.02114.x
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发表时间：
1999
影响因子：
4.8
通讯作者：
R. Terlevich
中科院分区：
文献类型：
--
作者：
J. Melnick;G. Tenorio;R. Terlevich
我们呈现了剑鱼座30星云中心区域的高信噪比长缝光谱，其空间分辨率（10.1 pc）和光谱分辨率（10.3 km s-1）前所未有。我们利用这些观测结果来研究全球星云的主要谱线增宽机制。我们没有发现显着的引力增宽的线的证据。因此，加宽似乎是由恒星风和热运动主导的。然而，我们确定了一个新的广泛的组成部分的线，解释了在以前的观察中确定的综合剖面机翼。宽分量出现在观测到的所有位置，可能与星云内高密度凝聚的光蒸发破坏有关。
We present high signal-to-noise ratio, long-slit spectra of the central region of the 30 Doradus nebula taken with unprecedented spatial (∼ 0.1 pc) and spectral (∼ 3 km s−1) resolution. We use these observations to investigate the dominant line-broadening mechanisms for the global nebula. We find no evidence for significant gravitational broadening of the lines. Thus, broadening appears to be dominated by stellar winds and thermal motions. However, we identify a new broad component to the lines that explains the integrated profile wings identified in previous observations. The broad component appears at all positions observed, and is possibly related to the disruption through photo-evaporation of high-density condensations within the nebula.