| Title | WFPC2 observations of two dwarf spheroidal galaxies in the M 81 group |
| Authors | Karachentsev, I. D.; Sharina, M. E.; Dolphin, A. E.; Geisler, D.; Grebel, E. K.; Guhathakurta, P.; Hodge, P. W.; Karachentseva, V. E.; Sarajedini, A.; Seitzer, P. |
| Bibcode | 2001A&A...375..359K Search ADS ↗ |
| Abstract | We have obtained HST WFPC2 and ground-based images of two low surface brightness dwarf spheroidal galaxies in the M 81 group, FM1 and KKH57. Their colour-magnitude diagrams show red giant branches with tips at I = 23.77 +/- 0.14 and I = 23.97 +/-0.17, respectively. The derived true distance moduli, 27.66 +/- 0.16 and 27.96 +/- 0.19, agree well with the mean distance modulus of the M 81 group, 27.84 +/- 0.05. Absolute V magnitudes of the galaxies (-11.46 and -10.85), their colours ((B-V) = 0.88 and 0.80), and central surface brightnesses (Sigma 0,V = 24.8 and 24.4 mag/sq arcsec ) are in the range of other dSph companions of M 81, M 31, and Milky Way. With two new objects the maximum projected radius of the dwarf spheroidal subsystem around M 81 is 380 kpc. Based on observations made with the NASA/ESA Hubble Space Telescope. The Space Telescope Science Institute is operated by the Association of Universities for Research in Astronomy, Inc. under NASA contract NAS 5-26555. Based in part on observations obtained with the Apache Point Observatory 3.5-meter telescope, which is owned and operated by the Astrophysical Research Consortium. |
| Objects | 3 Objects Search NED ↙ |
