The acceleration of molecular hydrogen clouds through radiative dissociation

Details The acceleration of molecular hydrogen clouds through radiative dissociation The acceleration of molecular hydrogen clouds through radiative dissociation

Mar 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...266..602h&link_type=abstract

Astrophysical Journal, Part 1, vol. 266, Mar. 15, 1983, p. 602-608.

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10

Gas Dissociation, Interstellar Matter, Molecular Clouds, Nebulae, Particle Acceleration, Atomic Collisions, H Ii Regions, Momentum, Oort Cloud, Radiative Transfer, Ultraviolet Radiation

Scientific paper

Oort and Spitzer (1955) suggested that neutral hydrogen surrounding an H II region could be accelerated by what they called a 'rocket effect'. It is pointed out that a similar mechanism which may be appreciably more efficient should be effective in accelerating molecular hydrogen clouds ahead of radiatively dissociated hydrogen in interstellar space. A mechanism of such a type appears to be necessary in order to account for the high velocities observed in Orion, or lower-velocity motions in diffuse clouds near bright, hot stars. A comparison is conducted regarding the momenta which can be transferred to a gaseous cloud through absorption of photons, the emission of photoelectrons, or the dissociation of atoms. It is found that dissociation is substantially more effective than the other two mechanisms. Attention is given to the requirements for efficient acceleration, the momenta of atoms, the rocket effect, and aspects of intensity. It is predicted that molecular hydrogen in highly accelerated clouds should be accompanied by atomic emission observable at 21 cm.

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