Mathematics – Probability
Scientific paper
Mar 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981mmsai..52...67g&link_type=abstract
(Consiglio Nazionale delle Ricerche, Meeting, Rome, Italy, May 30, 31, 1980.) Società Astronomica Italiana, Memorie, vol. 52, Ma
Mathematics
Probability
Galactic Evolution, Galactic Structure, Spiral Galaxies, Star Formation, Angular Velocity, Cosmology, Disk Galaxies, Galactic Rotation, Hubble Diagram, Probability Theory, Radii, Star Formation Rate, Velocity Measurement
Scientific paper
A statistical approach to the problem of star formation is discussed in which a single general statement about star formation can provide very general but surprisingly specific predictions on how star formation may proceed in all galaxies throughout their evolution. The approach is based on the statement: given a region of presently active star formation, there is a finite probability that a new region of star formation will appear in its vicinity after a certain elapsed time. Some results of the approach are: (1) spiral structure is the stable configuration of a flat system; (2) the star formation rate increases as rotational velocity increases; (3) the Hubble sequence is a sequence of star formation rates; (4) on the average, the star formation rate per unit gas mass should decrease with radius for disk galaxies; and (5) there may be a minimum critical size of a system below which chain-reaction star formation cannot sustain itself.
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