一个新的z = 0.111的碰撞环星系：御夫座轮
A New Collisional Ring Galaxy at z = 0.111: Auriga's Wheel
摘要：
我们报告了一个碰撞环星系的偶然发现，被确定为2 MASX J 06470249 +4554022，我们称之为“御夫座之轮”，作为更大的银河系调查的一部分，在SUPRIME-CAM框架中发现。这类特殊的星系是典型的晚型星系和早型星系之间近正面碰撞的结果。随后的GMOS-N长缝光谱证实了这对相互作用的成分的相对接近，并显示它具有0.111的红移。光谱分析表明，晚型星系是LINER类活动星系核，而早型星系也可能是活动星系核的候选者，这在已知的碰撞环星系中是非常罕见的。对环的初步建模发现，其膨胀速度约为200 km ^-1，这与我们的观测结果一致，也就是说，这次碰撞的历史大约为5千万年。环目前的半径约为10千秒差距，恒星和气体的桥梁也可以看到连接两个星系。
英文摘要：
We report the serendipitous discovery of a collision ring galaxy, identified as 2MASX J06470249+4554022, which we have dubbed 'Auriga's Wheel', found in a SUPRIME-CAM frame as part of a larger Milky Way survey. This peculiar class of galaxies is the result of a near head-on collision between typically, a late type and an early type galaxy. Subsequent GMOS-N long-slit spectroscopy has confirmed both the relative proximity of the components of this interacting pair and shown it to have a redshift of 0.111. Analysis of the spectroscopy reveals that the late type galaxy is a LINER class Active Galactic Nuclei while the early type galaxy is also potentially an AGN candidate, this is very uncommon amongst known collision ring galaxies. Preliminary modeling of the ring finds an expansion velocity of ~200 kms^-1 consistent with our observations, making the collision about 50 Myr old. The ring currently has a radius of about 10 kpc and a bridge of stars and gas is also visible connecting the two galaxies.
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