NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-08-17 T16:37:18 PDT
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For refcode 2015AstL...41..239T:
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NED Abstract

Copyright by American Institute of Physics. 2015AstL...41..239T M 101 group galaxies Tikhonov, N. A.; Lebedev, V. S.; Galazutdinova, O. A. Abstract. 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_sun_. The dynamical mass of M 101 calculated on the basis of the four galaxies constituting the group is 6.2 x 10^11^ M_sun_. The mass-to-light ratio for this mass is M/ L = 18 (at the adopted luminosity of M 101, M_ B_ = -20.8). Key words: individual galaxies: M 101, NGC 5474, NGC 5477, UGC 9405, Ho IV, M 51, M 63, stellar photometry of galaxies: distances to galaxies, masses of galaxies, galaxy groups, M 101 group
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