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M 101 Group Galaxies

机译：M 101群星系

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摘要

Based on archival Hubble Space Telescope images, we have performed stellar photometry for the galaxy M 101 and other neighboring galaxies located at a small angular distance from M 101 and having radial velocities similar to that of M 101: M 51, M 63, NGC 5474, NGC 5477, UGC 9405, Ho IV, KUG1413+573, and others. Based on the TRGB method, we have determined the distances to these galaxies. We have found that the M 101 group lies at a distance of 6.8 Mpc and is a small compact galaxy group consisting of four galaxies: NGC 5474, NGC 5477, UGC 9405, and Ho IV. The bright massive galaxies M 51 and M 63 are considerably farther (D = 9.0 and 9.3 Mpc, respectively) than the M 101 group and do not belong to it. Applying the virial theorem to 27 objects (H II regions and galaxies), M 101 satellites located at different distances from the galaxy, has revealed an increase in the dynamical mass of M 101 with increasing sizes of the system of satellites used in calculating the mass. The maximum calculated mass of M 101 is 7.5 x 10(11) M-circle dot. The dynamical mass of M 101 calculated on the basis of the four galaxies constituting the group is 6.2 x 10(11) M-circle dot. The mass-to-light ratio for this mass is M/L = 18 (at the adopted luminosity of M 101, M-B = -20.8).
机译：根据档案哈勃太空望远镜的影像，我们对星系M 101和其他邻近星系进行了恒星测光，这些星系与M 101的夹角较小，且径向速度与M 101相似：M 51，M 63，NGC 5474 ，NGC 5477，UGC 9405，Ho IV，KUG1413 + 573等。基于TRGB方法，我们确定了到这些星系的距离。我们发现M 101组的距离为6.8 Mpc，是由四个星系组成的小型紧凑星系组：NGC 5474，NGC 5477，UGC 9405和Ho IV。明亮的大质量星系M 51和M 63比M 101组远得多（分别为D = 9.0和9.3 Mpc），并且不属于该星系。将毒理定理应用于27个物体（H II区域和星系），距星系不同距离的M 101卫星发现，随着用于计算质量的卫星系统尺寸的增加，M 101的动力学质量也随之增加。 M 101的最大计算质量为7.5 x 10（11）M圆点。根据构成该组的四个星系计算的M 101的动态质量为6.2 x 10（11）M圆点。该质量的质光比为M / L = 18（在采用的发光度M 101下，M-B = -20.8）。

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