Physics
Scientific paper
Apr 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975pthph..53.1042o&link_type=abstract
Progress of Theoretical Physics, Vol. 53, No. 4, pp. 1042-1057
Physics
7
Scientific paper
The time variation and the spatial variation of the gas density and the metal abundance Z on the disk of spiral galaxy are investigated by introducing the density wave theory. It becomes clear thet stars are formed in the region r ≲ 12.5 kpc mainly through the gas compression by the galactic shocks which take place with the passage of density wave, and only through the inelastic collision of clouds in r ≳ 12.5 kpc, r being the distance from the galactic center. At the time t ≳ 4 × 109 yr after the birth of the galaxy, the gas distribution has a maximum at the radius of about a balf of the galactic radius. The efficiency of star formation from collapsing clouds is determined to the about 5 to 8 depending upon the various conditions. Heavy elements smoothly distribute throughout the galactic disk with the decreasing abundance with r, holding almost constant ratios Z(3 kpc)/Z(10 kpc) ≃ 3.5 and Z(3 kpc)/Z(18 kpc) ≃ 17 from t = 0 to 15 × 109 yr. This steep distribution of metals is not consistent with observations and indicates that the gas mixing and the migration of stars have effectively occurred on the disk, whose effects are not taken into account here.
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