Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-09-08
Astronomy and Astrophysics
Astrophysics
18 pages, 5 figures, accepted for publication in Astrofizica
Scientific paper
Based on accurate measurements of distances to nearby galaxies made with Hubble Space Telescope, we determined the radii of the zero-velocity surface: R_0 = 0.96+-0.03 Mpc for the Local Group and R_0 = 0.89+-0.05 Mpc for the group of galaxies around M81/M82. This yields the total masses of the groups to be M_T = (1.29+-0.14) 10^{12} M_sun and M_T = (1.03+-0.17) 10^{12} M_sun, respectively. The R_0-method allowed us to determine the mass ratio of the brightest two members in the considered groups. Based on the minimum scatter of galaxies with respect to the Hubble regression, we derived a mass ratio of 0.8 : 1.0 for the Milky Way and Andromeda, and 0.54 : 1.00 for M82 and M81, which is quite close to the ratio of luminosities of these galaxies.
Karachentsev Igor D.
Kashibadze O. G.
No associations
LandOfFree
Total masses of the Local Group and M 81 group derived from the local Hubble flow does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Total masses of the Local Group and M 81 group derived from the local Hubble flow, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Total masses of the Local Group and M 81 group derived from the local Hubble flow will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-2246