H-alpha images of early type galaxies with hot gas
H-alpha images of early type galaxies with hot gas
复制标题
含有热气体的早期型星系的 H-α 图像
DOI：
10.1086/115794
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发表时间：
1991
期刊：
影响因子：
--
通讯作者：
S. D. Alighieri
中科院分区：
文献类型：
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作者：
G. Trinchieri;S. D. Alighieri
根据爱因斯坦天文台的数据，对13个已知X射线通量的早期类型星系进行了H-α成像观测，并对其中9个星系进行了长缝光谱观测。在10个物体的中心区域检测到了H-α发射。线发射的半径为5-10kpc，通常在原子核上达到峰值，具有规则的椭圆形等光线，类似于红色连续谱，但具有更陡峭的径向分布。少数病例也可见低表面亮度的丝状结构(NGC4406和NGC5846)。为了研究早期类型星系中星际介质的不同阶段，比较了热(X射线)和热(H-α)气体的发射。平均而言，热气体含量较大的星系也表现出更强的线发射。然而，关系中的离散性是显著的，这表明其他参数肯定起到了作用。引力势的深度和/或物体的形状可能是决定早期类型星系中存在的气体数量的重要因素。参考文献50篇。
H-alpha imaging observations of 13 early type galaxies with known X-ray fluxes are presented from the Einstein Observatory data, and long-slit spectroscopy of nine of these. H-alpha emission is detected in the central regions of ten objects. The line emission appears extended over a radius of 5-10 kpc, is generally peaked on the nucleus with regular elliptical isophotes, similar to the red continuum, although with a steeper radial distribution. Low surface brightness filamentary structure is also seen in a few cases (NGC 4406 and NGC 5846). To study the different phases of the interstellar medium in early type galaxies, the emissions due to hot (X-ray) and warm (H-alpha) gas are compared. On average, galaxies with a larger content of hot gas also show a more powerful line emission. However, the scatter in the relation is significant, and suggests that other parameters must play a role. The depth of the gravitational potential and/or the shape of the objects are probably important in determining the amount of gas present in early type galaxies. 50 refs.