Hostname: page-component-7bb8b95d7b-dtkg6 Total loading time: 0 Render date: 2024-10-06T15:36:29.220Z Has data issue: false hasContentIssue false
  • English
  • Français

Evolutionary Effect in Quasars as a Consequence of Galaxy Formation Process

Published online by Cambridge University Press:  04 August 2017

I. S. Shklovsky

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.

Many years ago M. Schmidt established the presence of a strong evolutionary effect in quasistellar objects (QSOs). Though this important problem is not yet fully resolved, there can be no doubt that in earlier epochs of the Universe evolution of the spatial density of QSOs (in the comoving coordinates) was much higher than it is now. Thus, for instance, the spatial density of the optically selected QSO is:

according to Schmidt (1977). Here τ = z/(l+z), whence, for instance, if z = 3, ρ ∼ 1000 ρ0, where ρ0 is the local density.

Type
Research Article
Information
Symposium - International Astronomical Union , Volume 104: Early Evolution of the Universe and Its Present Structure , 1983 , pp. 371 - 373
Copyright
Copyright © Reidel 1983 

References

Schmidt, M. 1977, Physica Scripta, 7, 135.Google Scholar
Osmer, P. 1981, Ap. J., 253, 28.Google Scholar
Shklovsky, I.S. 1964, Soviet A.J., 41, 801.Google Scholar
Stockton, A. 1982, Ap. J., 257, 33.Google Scholar
Marcelin, M., Boulesteix, J., Courtes, G., Milliard, B. 1982, Nature, 297, 38.Google Scholar
O'Connel, R. 1980, Ap. J., 236, 430.Google Scholar
Stocke, J., and Perrenod, S. 1981, Ap. J., 245, 375.CrossRefGoogle Scholar