Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990sciam.263...56r&link_type=abstract
Scientific American (ISSN 0036-8733), vol. 263, Nov. 1990, p. 56-60, 62, 64, 66.
Astronomy and Astrophysics
Astronomy
2
Black Holes (Astronomy), Galactic Evolution, Galactic Nuclei, Quasars, Accretion Disks, Andromeda Galaxy, Cygnus Constellation, Galactic Bulge, Gravitational Collapse, Interacting Galaxies, Milky Way Galaxy
Scientific paper
The role of black holes is discussed as it relates to the birth of galaxies and generation of quasars. The possible existence of black holes in the Cygnus A and Andromeda galaxies is discussed, and it is suggested that the quasar population was far larger and more concentrated in the early universe than it is now. Telltale signs of quiescent black holes include sharp spikes in the galaxy's light profile and the presence of stars that are moving anomalously fast near the galaxy's center. A black hole captures all stars within a critical radius, and a star that approaches the hole at small angles enters the tidal radius where it is torn apart, some of its gas falling into the hole. Slingshot ejection occurs when a binary star approaches a black hole and one star is captured, while the other escapes at up to 10,000 km/sec. The concept of merging galaxies, bringing black holes together from two galactic centers, is discussed. The possible existence of a black hole in the Galaxy is considered.
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