Interacting Galaxies in Clusters of Galaxies an dMassive Halos

螺旋星系平坦的自转曲线和椭圆星系的X射线通量表明星系周围存在暗物质，称之为“质量晕”。这些质量在可见光、红外线、无线电或X射线辐射中都没有被探测到，只是被“感觉”为引力的来源，因此很难研究星系周围的质量及其分布。本研究项目的目的是通过观测相互作用星系由于潮汐力而产生的变形，来深入了解大质量晕的本质。从这个角度来看，我们在过去两年中开展了以下七个项目。1.武仙座超星系团环状星系巡天。2.在六分仪中发现一个新的环星系的Seyfert 1核。3.相互作用对阿普90中的双发射线云。4.室女座星系团矮星系轴的环境效应。5.气体对卵形变形引力势的响应。6.武仙座超星系团中的一个cD星系IC 1209周围的巨大弧。7.关于Hoag型天体NGC6028及相关星系的性质大质量晕是当前天文学的基本问题之一。通过这项为期两年的研究项目，我们获得了一些相互作用星系的宝贵数据，并希望继续进一步研究。

Flat rotation curves of spiral galaxies and X-ray fluxes from elliptical galaxies implies the presence of dark matter around galaxies, which are called as "massive halo". These masses have not been detected in either visible light, infrared, radio, or x-ray radiations, but are only "felt" as the source of gravity.Hence it is quite difficult to examine the amount of mass and its distribution around galaxies.The aim of this research project is to get insight into the nature of massive halo by observing deformation of interacting galaxies due to tidal forces. From this point of view, we have conducted the following seven projects during thelast two years. 1. Survey of ring galaxies in the Hercules supercluster of galaxies. 2. Discovery of a Seyfert 1 nucleus of a new ring galay in Sextans. 3. Dual emission line clouds in the interacting pair Arp 90. 4. Environmental effects on dwarf galaxis of the Virgo cluster of galaxies. 5. Gas responce to an ovally deformed gravitational potential. 6. A giant arc around a cD galaxy IC 1209 in the hercules supercluster of galaxies. 7. On the nature of Hoag type object NGC 6028 and related galaxies.Massive halo is one of the fundamental problems of current astronomy. From this two-years research project, we have obtained invaluable data on a few interacting galaxies, and would like to continue our study further.