The modern view of the nature of the spiral structure of galaxies.

Details The modern view of the nature of the spiral structure of galaxies. The modern view of the nature of the spiral structure of galaxies.

Apr 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989usfin.157..599e&link_type=abstract

Usp. Fiz. Nauk, Vol. 157, No. 4, p. 599 - 629

Computer Science

3

Spiral Galaxies: Models, Spiral Galaxies: Evolution, Spiral Galaxies: Density Waves, Spiral Galaxies: Star Formation

Scientific paper

The current state of the Lin-Shu density wave theory is discussed according to modern observational data. Much attention is paid to the problem of wave excitation and to the response of the interstellar gas to the wave gravitational potential. It is noticed that the major predictions of the theory - the galactic shocks, the spiral velocity field of stars, and the age gradient across the spiral arms - have become nowadays the fundamental observational facts, so the density wave theory is now out of competition among alternative theories. The nature of flocculent spirals as it believed being connected with the induced star formation in differentially rotating galactic disk rather than with the density waves is also discussed.

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