Is Dark Matter Needed in Galaxies?
- Authors: Rozgacheva I.K.1, Agapov A.A.1
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Affiliations:
- All-Russia Institute for Scientific and Technical Information
- Issue: Vol 62, No 9 (2018)
- Pages: 551-556
- Section: Article
- URL: https://journals.rcsi.science/1063-7729/article/view/191756
- DOI: https://doi.org/10.1134/S106377291809007X
- ID: 191756
Cite item
Abstract
Arguments indicating that galaxies and galaxy clusters should be considered open, forming systems are presented. Galaxies interact with the intergalactic medium, and are not in virial equilibrium (determined by gravitation and rotation). The usual interpretation of the rotation curves of the outer regions of galaxies beyond the visible stellar disk—that they imply the presence of a massive dark-matter halo— could be erroneous in this case: if the intergalactic medium is being accreted in these regions, the orbital speeds of clouds of neutral hydrogen will not be determined purely by the gravitation of the mass inside their orbits. Galaxy clusters accrete matter (intergalactic gas and galaxies) from the filaments of the large-scale structure at whose intersections they are located. Only their inner regions can approach virial equilibrium. Therefore, the high speeds of galaxies and the high temperature of the intergalactic gas in clusters does not necessarily imply the presence of a high mass of dark matter in galaxy clusters.
About the authors
I. K. Rozgacheva
All-Russia Institute for Scientific and Technical Information
Author for correspondence.
Email: rozgacheva@viniti.ru
Russian Federation, Moscow, 125190
A. A. Agapov
All-Russia Institute for Scientific and Technical Information
Email: rozgacheva@viniti.ru
Russian Federation, Moscow, 125190
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