Astronomy and Astrophysics – Astrophysics
Scientific paper
1996-04-12
Astronomy and Astrophysics
Astrophysics
22 pages, Postscript, no figures. Also available at: http://www.dao.nrc.ca/DAO/SCIENCE
Scientific paper
10.1086/133839
Cepheid variables are used to derive a Virgo cluster distance of 16.0 +/- 1.5 Mpc. In conjunction with the Coma velocity and the well-established Coma/Virgo distance ratio, this yields a Hubble paprameter Ho = 81 +/- 8 km/s/Mpc. By combining this value with an age of the Universe of at least 16.8 +/- 2.1 Gyr, that is derived from the metal-poor globular cluster M92, one obtains f(Omega,Lambda) > 1.39 +/- 0.22. This value is only marginally consisitent with an Einstein-de Sitter universe with Omega=0 and Lambda=0, which has f=1. An Einstein-de Sitter universe with Omega=1 and Lambda=0, for which f=2/3, appears to be excluded at the 3-sigma level. It is shown that some small recent values of Ho resulted from the intrinsic dispersion in the linear diameters of galaxies, and from the fact that well-observed supernovae of Type Ia exhibit a luminosity range of ~20 at maximum light.
No associations
LandOfFree
The Extragalactic Distance Scale 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 The Extragalactic Distance Scale, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Extragalactic Distance Scale will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-463891