Hostname: page-component-586b7cd67f-tf8b9 Total loading time: 0 Render date: 2024-11-25T22:42:48.591Z Has data issue: false hasContentIssue false
  • English
  • Français

Local Group Dynamics

Published online by Cambridge University Press:  25 May 2016

D. Lynden-Bell
D. Lynden-Bell*
Affiliation:
Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge. CB3 0HA UK

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

The distance from the Local Group to the ‘sphere’ of small galaxies that no longer expand with the Universe determines the time since the Big Bang, t x M1/2, where M is the mass of the Local Group. Adopting Feast's new distance scale, this distance is found to be 1.35 ± 0.1 Mpc. The velocity of approach and the distance to M31 give a different combination of t and M, thus both can be deduced. We find the time since the Big Bang and The importance of accurate distances for such results is stressed. If all distances are revised by a factor λ then both t and M change by that factor.

Type
Part 1: Setting the Scene
Information
Symposium - International Astronomical Union , Volume 192: The Stellar Content of Local Group Galaxies , 1999 , pp. 39 - 50
Copyright
Copyright © Astronomical Society of the Pacific 1999 

References

Dunn, A.M., LaFlamme, R. 1993, MNRAS, 426, 865 CrossRefGoogle Scholar
Dunn, A.M., LaFlamme, R. 1995, ApJ, 443, L1 CrossRefGoogle Scholar
Gott, J.R., Thuan, T.X. 1978, ApJ, 223, 426 CrossRefGoogle Scholar
Kahn, F.D., Woltjer, L. 1959, ApJ, 130, 705 CrossRefGoogle Scholar
Lynden-Bell, D. 1981, Observatory, 101, 111 Google Scholar
Lynden-Bell, D. 1982, in: Vatican Conference on Astrophysical Cosmology , Pontifical Academy Scripta Varia, 48, 85 Google Scholar
Lynden-Bell, D., Frenk, C.S. 1981, Observatory, 101, 200 Google Scholar
Mishra, R. 1985, MNRAS, 212, 163 CrossRefGoogle Scholar
Peebles, P.J.E. 1989, ApJ, 344, L53 CrossRefGoogle Scholar
Peebles, P.J.E. 1990, ApJ, 362, 1 CrossRefGoogle Scholar
Peebles, P.J.E. 1994, ApJ, 429, 43 CrossRefGoogle Scholar
Raychaudhury, S., Lynden-Bell, D. 1989, MNRAS, 240, 195 CrossRefGoogle Scholar
Roberts, M.S., Rots, A.H. 1973, A&A, 26, 483 Google Scholar
Schmoldt, I.M., Saha, P. 1998, Oxford Preprint Van den Bergh, S. 1998, ApJ, 505, L127 Google Scholar
Whiting, A. 1997, Thesis, Cambridge University Google Scholar