Hostname: page-component-788cddb947-wgjn4 Total loading time: 0 Render date: 2024-10-19T23:09:13.523Z Has data issue: false hasContentIssue false
  • English
  • Français

The circular velocity at the sun

Published online by Cambridge University Press:  14 August 2015

G. R. Knapp
G. R. Knapp*
Affiliation:
Owens Valley Radio Observatory, Caltech

Extract

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 galactic rotation velocity at the Sun, , can be derived several ways, none of them direct and unambiguous - (1) the solar velocity can be found relative to the halo population (the RR Lyrae stars, globular clusters etc.), but may contain an unknown contribution from possible systematic rotation of the halo system (2) the product Ro ω(Ro) = Ro (A-B) can be calculated but is uncertain because of large uncertainties in each of these three quantities (3) the motion of the Sun with respect to the center of the Local Group can be found but includes the motion of the galactic center of mass and (4) the velocity-longitude dependence of the outer HI boundary can be examined to deduce the most likely value of . The incorporation of new data into analyses using methods (1) and (3) gives essentially the same answers as older studies. Examination of the accumulated current evidence suggests that the best values for the solar rotation velocity and the galactocentric distance Ro are 220 km s−1 and 8.5 kpc respectively.

Type
IV. GALACTIC KINEMATICS AND DISTANCES
Information
Symposium - International Astronomical Union , Volume 84: The Large-Scale Characteristics of the Galaxy , 1979 , pp. 225 - 230
Copyright
Copyright © Reidel 1979 

References

Balona, L.A., and Feast, M.W. 1974, M.N.R.A.S. 167, p 621.CrossRefGoogle Scholar
Crampton, D., Bernard, D., Harris, B.L., and Thackeray, A.D. 1976, M.N.R.A.S. 176, p 683.CrossRefGoogle Scholar
Crampton, D., and Georgelin, Y.P. 1975, Astron. Astrophys. 40, p 317.Google Scholar
de Vaucouleurs, G. 1972, in I.A.U. Symposium 44, ed. Evans, D.J., D. Reidel Publishing Co., Dordrecht, Holland.Google Scholar
Dieckvoss, W. 1978, Astron. Astrophys 62, p 445.Google Scholar
Fricke, W. and Tsioumis, A. 1975, Astron. Astrophys. 42, p 449.Google Scholar
Greenstein, J.L., and Toomre, A.R. 1978, in preparation.Google Scholar
Gunn, J.E., Knapp, G.R., Tremaine, S.D. 1978, (in preparation) Google Scholar
Harris, W.E. 1976, A.J. 81, p 1095.CrossRefGoogle Scholar
Hartwick, F.D.A., and Sargent, W.L.W. 1978, Ap. J. (in press) Google Scholar
Isobe, S. 1974, Astron. Astrophys. 36, p 327.Google Scholar
Jackson, P.D. 1978, preceding paper.Google Scholar
Kwee, K.K., Muller, C.A., and Westerhout, G. 1954, B.A.N. 12, p 211.Google Scholar
Lin, D.N.C., and Lynden-Bell, D. 1977, M.N.R.A.S. 181, p 59.CrossRefGoogle Scholar
Lynden-Bell, D. 1976, M.N.R.A.S. 174, p 695.CrossRefGoogle Scholar
Lynden-Bell, D., and Lin, D.N.C. 1977, M.N.R.A.S. 181, p 37.CrossRefGoogle Scholar
Mihalas, D. 1968, ‘Galactic Astronomy’ W.H. Freeman Co., San Francisco.Google Scholar
Oort, J.H., and Plaut, L. 1975, Astron. Astrophys. 41, p 71.Google Scholar
Rubin, V.C., 1978, preceding paper.Google Scholar
Schmidt, M., 1965, in ‘Galactic Structure’, ed. Blaauw, A. and Schmidt, M., University of Chicago Press.Google Scholar
Woltjer, L. 1975, Astron. Astrophys. 42, p 109.Google Scholar
Yahil, A., Tammann, G., and Sandage, A.R. 1977, Ap. J. 217, p 903.CrossRefGoogle Scholar