NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-26 T23:43:23 PDT
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For refcode 2000A&A...363..117K:
Retrieve 32 NED objects in this reference.
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Copyright by European Southern Observatory (ESO). Reproduced by permission
2000A&A...363..117K Dwarf spheroidal galaxies in the M 81 group imaged with WFPC2. KARACHENTSEV I.D., KARACHENTSEVA V.E., DOLPHIN A.E., GEISLER D., GREBEL E.K., GUHATHAKURTA P., HODGE P.W., SARAJEDINI A., SEITZER P., SHARINA M.E. Received 17 May 2000/Accepted 22 August 2000 Abstract: We obtained HST/WFPC2 images of the dwarf spheroidal (dSph) galaxies K 61, K 63, K 64, DDO 78, BK 6N, and kk 77 in the M 81 group. Our color-magnitude diagrams show red giant branches with tips (TRGB) falling within the range of I=[23.8-24.0]mag. The derived true distance moduli (DM) of the 6 dSphs ranging from 27.71 to 27.93mag are consistent with their membership in the group. Given accurate distances of 5 other group members, which have been derived via TRGB or cepheids, the mean DM of the M81 group is (27.84+/-0.05) mag. We find the difference of the mean distances to the M81 and NGC 2403 groups to be D_M81_-D_NGC2403_ = (0.5+/-0.2)Mpc, which yields a deprojected separation of 0.9 Mpc. With respect to the Local group, M 81 and NGC 2403 have radial velocities of 106 and 267 km s^-1^ respectively, while the velocities of the group centroids are 142 and 281 km s^-1^. The higher velocity of the closer system may indicate that these groups are moving towards each other, similar to the Milky Way and M 31 in the Local group. Several globular cluster candidates have been identified in the galaxies. Key words: galaxies: dwarf - galaxies: individual: M 81 group - galaxies: photometry
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