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Formation of globular clusters from gas in large-scale unorganized motion in galaxies

1993; IOP Publishing; Volume: 404; Linguagem: Inglês

10.1086/172265

1538-4357

Y. Kumai, B. N. Basu, M. Fujimoto,

Astronomy and Astrophysical Research

view Abstract Citations (59) References (98) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Formation of Globular Clusters from Gas in Large-Scale Unorganized Motion in Galaxies Kumai, Yasuki ; Basu, Baidyanath ; Fujimoto, Mitsuaki Abstract From dynamical data on interstellar gas and gobular clusters with ages of 5 x 10^6^-10^10^ yr in the Magellanic Clouds, it is claimed that globular clusters may be generated at any time in any galaxy, if interstellar gas clouds are in large-scale unorganized motion with velocity of more than 50-100 km s^-1^ and they collide with each other to make strong local shock compressions. Dynamical and optical characteristics of globular clusters are explained to be consistent with this mechanism in the Galaxy, the Magellanic Clouds, M31, M33, M82, M87, NGC 1275, and other nearby galaxies. Theories are surveyed to produce a grand scenario that (1) the minimum mass of the Jeans gravitational instability is 10^4^-10^6^ M_sun_ for gas compressed by, collision of clouds with velocity of >= 50-100 km s^-1^, (2) low-mass stars are more numerously and more quickly formed near the protoglobular cluster center, and that (3) this stellar system is gravitationally stable against the blow-out of gas by newborn stars and/or by supernovae, which results in the delayed appearance of the cluster formation. We also suggest that more massive globular clusters are formed from gases with lower metal abundance and in higher velocity collision. Publication: The Astrophysical Journal Pub Date: February 1993 DOI: 10.1086/172265 Bibcode: 1993ApJ...404..144K Keywords: Globular Clusters; Interstellar Gas; Magellanic Clouds; Milky Way Galaxy; Stellar Evolution; Abundance; Andromeda Galaxy; Computational Astrophysics; Dynamical Systems; Gravitational Effects; Stellar Mass; Astrophysics; GALAXY: GLOBULAR CLUSTERS: GENERAL; ISM: GENERAL; GALAXIES: MAGELLANIC CLOUDS; STARS: FORMATION full text sources ADS | data products SIMBAD (10) NED (7)