The role of orbital dynamics and cloud-cloud collisions in the formation of giant molecular clouds in global spiral structures

Details The role of orbital dynamics and cloud-cloud collisions in the formation of giant molecular clouds in global spiral structures The role of orbital dynamics and cloud-cloud collisions in the formation of giant molecular clouds in global spiral structures

Mar 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...314...10r&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 314, March 1, 1987, p. 10-32.

Other

78

Galactic Structure, Interstellar Matter, Molecular Clouds, Orbital Mechanics, Spiral Galaxies, Star Formation, Astronomical Models, Computerized Simulation, Galactic Evolution

Scientific paper

The role of orbit crowding and cloud-cloud collisions in the formation of GMCs and their organization in global spiral structure is investigated. Both N-body simulations of the cloud system and a detailed analysis of individual particle orbits are used to develop a conceptual understanding of how individual clouds participate in the collective density response. Detailed comparisons are made between a representative cloud-particle simulation in which the cloud particles collide inelastically with one another and give birth to and subsequently interact with young star associations and stripped down simulations in which the cloud particles are allowed to follow ballistic orbits in the absence of cloud-cloud collisions or any star formation processes. Orbit crowding is then related to the behavior of individual particle trajectories in the galactic potential field. The conceptual picture of how GMCs are formed in the clumpy ISMs of spiral galaxies is formulated, and the results are compared in detail with those published by other authors.

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