空环星系ESO 474 - G040
The empty ring galaxy ESO 474 - G040
摘要：
我们描述了明显空环星系ESO 474-G 040获得的南部非洲大望远镜（SALT）的意见。这些观测包括成像、长缝光谱学和H-α线的法布里-珀罗绘图，可以确定环的运动学，并估计环的金属丰度和环各部分的恒星星族组成。我们认为，该物体最好被理解为是过去盘状星系合并的结果，它形成了一个气体环，随后通过珠不稳定性而被破坏，目前正在形成恒星。
英文摘要：
We describe observations of the apparently empty ring galaxy ESO 474-G040 obtained with the Southern African Large Telescope (SALT). The observations, consisting of imaging, long-slit spectroscopy and Fabry-Perot mapping of the H-alpha line, allow determining the ring kinematics as well as estimating the metallicity of the ring and the stellar population composition in its various parts. We propose that the object could best be understood as being the result of a past merger of disk galaxies, which formed a gas ring that subsequently disrupted via the bead instability and is presently forming stars.
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