极环星系AM 2040-620及其可能的伴星
The polar ring galaxy AM 2040-620 and its possible companion
摘要：
极环星系（PRG）是一种特殊的系统，其中富含气体，接近极地的环围绕着宿主星系。它们是星系相互作用的结果，主要是由来自富含气体的施主星系的物质潮汐吸积形成的。PRG的形成机制有很多：次要或主要的合并，潮汐吸积事件，或直接从宇宙网的细丝中吸积冷气体。这些物体可以用来探测暗物质晕的三维形状，前提是环与宿主星系的引力势保持平衡。极环星系AM 2040-620是这项工作的主题，它还没有得到很好的研究。这个星系包含一个几乎垂直的扭曲环和一个可能的西北伴星系。这个天体的径向速度是3301 \pm 65 km/s，根据文献，它是一组15个可能的极环星系的一部分。为了更好地理解这个系统，图像和长缝光谱观察与1.60米OPD/LNA望远镜。在I波段图像中，环的外部部分是不对称的。在东侧发现了一个扰动和一个微弱的羽流。两颗小卫星位于北方。在这张图片中，凸起是椭圆形的，但不是完全对称的。B波段的图像显示了在东西方向延伸到环之外的物质。经过处理后，B图像显示可能的伴星系2 MASX J20441668-6158092有一个潮汐扰动盘。它的径向速度是未知的，但仍在分析中的光谱学将提供这一信息。
英文摘要：
Polar ring galaxies (PRGs) are peculiar systems where a gas-rich, nearly polar ring surrounds a host galaxy. They are the result of galaxy interactions that form mainly by tidal accretion of material from a gas rich donor galaxy. There is a number of formation mechanisms for PRGs: minor or major mergers, tidal accretion events, or direct cold gas accretion from filaments of the cosmic web. These objects can be used to probe the three-dimensional shape of dark matter haloes, provided that the ring is in equilibrium with the gravitational potential of the host galaxy. The polar ring galaxy, AM 2040-620, which has not yet been well studied, is the subject of this work. This galaxy contains an almost perpendicular warped ring and one possible companion galaxy to the NW. The radial velocity of this object is 3301\pm65 km/s and is part of a group of fifteen possible polar ring galaxies, according to the literature. In order to better understand this system, images and long slit spectra were observed with the 1.60 m OPD/LNA telescope. In the I band image, the outer parts of the ring are not symmetrical. A disturbance in the Eastern side and a faint plume were detected. Two small satellites are located to the north. The bulge is elliptical but not perfectly symmetrical in this image. The B-band image shows material that extends beyond the ring in the western and eastern directions. After processing, the B-image shows that the possible companion galaxy 2MASX J20441668-6158092 has a tidally disturbed disk. Its radial velocity is unknown, but the spectroscopy, which is still under analysis, will furnish this information.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
