Galaxy Collision and Activation of Galactic Nuclei

星系碰撞假说被认为是活动星系核形成的可能机制.例如，在一个实施例中，塞弗特星系和类星体。根据这一理论，碰撞星系或目标星系中的气体可以吸积到星系中心的黑洞上，从而激活星系核。我们研究了40多个被认为是通过星系碰撞形成的环形星系的核谱。样本星系取自Arp-Madore's Catalogue of Peculiar Galeries（1989）。CCD数据由CTIO的1.5米望远镜的卡塞格伦摄谱仪拍摄，在SUN工作站上用IRAF系统处理，该工作站是用本基金购买的。我们的初步结果如下：1）大多数环星系都有强的发射线; 2）它们大多是星星爆发型或LINER型，只有3个核是Seyfert 2型; 3）在目前的样本中，我们没有发现新的Seyfert 1型环星系，因此不能证实上述关于环星系的猜想。5）这些结果可能意味着这种类型的星系碰撞，即星系碰撞，可能是由星系碰撞引起的，也可能是由星系碰撞引起的。例如，一个星系垂直穿透目标星系的盘，可能对核供给没有效率。今年将进行进一步的观测。

A galaxy collision hypothesis was examined as a plausible mechanism of active galactic nuclei, e. g., Seyfert galaxies and quasars. According to this senario, gas in colliding or target galaxies can accrete onto central black holes in galaxies, and so activate their nuclei.We studied nuclear spectra of more than 40 ring galaxies which are believed to have formed through galaxy collisions. Sample galaxies were taken from the Arp-Madore's Catalogue of Peculiar Galaxies (1989). CCD data, taken with the Cassegrain spectrograph of the 1.5m telescope-at CTIO, were reduced with IRAF system on SUN work station, which was purchased with the present grant. Our preliminary results are given bellow.1) Most of ring galaxies show strong emission lines.2) They are mostly star burst type or LINER, and only three nuclei are found to be Seyfert 2 type.3) Among the present sample, we found no new ring galaxies of Seyfert 1 type, and so cannot confirm the above conjecture for the case of ring galaxies.4) By cross checking their optical positions with IRAS Point. Source Catalog, most of ring galaxies are found to be strong IRAS sources.5) These results may imply that this type of galaxy collisions, i. e., a vertical penetration of a galaxy through a disk of a target galaxy, may not be efficient for nuclear feeding.Further observations are scheduled in this year.