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Galaxy Formation and Dark Matter

Published online by Cambridge University Press:  14 August 2015

Martin Rees
Martin Rees*
Affiliation:
Institute of Astronomy, Madingley Road Cambridge, CB3 0HA

Extract

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My aim in this general talk will be to air some questions, rather than offer firm answers, because the most basic questions about galaxies are indeed still unresolved. In particular:

1. We do not know why such things as galaxies should exist at all — why these assemblages of stars and gas with fairly standardised properties are the most conspicuous large-scale features of the cosmos.

2. About 90% of the mass associated with galaxies is hidden. The luminous stars and gas contribute only about a tenth of the gravitating material inferred from dynamical arguments. What the rest consists of is still a mystery.

3. It is unclear why the nuclei of some galaxies flare up, and release the colossal amount of non-stellar radiation emitted from quasars and radio galaxies, as discussed by Maarten Schmidt in his discourse.

Type
Invited Discourses
Information
Highlights of Astronomy , Volume 8: Highlights of Astronomy. As presented at the XXth General Assembly of the IAU, 1988 , 1989 , pp. 45 - 64
Copyright
Copyright © Kluwer 1989

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