Photolevitation of diffuse clouds

Details Photolevitation of diffuse clouds Photolevitation of diffuse clouds

Jan 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...366..443f&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 366, Jan. 10, 1991, p. 443-449.

Astronomy and Astrophysics

Astrophysics

48

Cosmic Dust, Interstellar Matter, Milky Way Galaxy, Molecular Clouds, Radiation Pressure, Equations Of Motion, Gravitational Effects, Neutral Gases

Scientific paper

Radiation pressure on dust grains can raise small dusty clouds above the main gaseous disk to high Galactic latitudes. This photolevitation effect drives neutral gas and dust into a soft Galactic fountain and can maintain a column density of the order of 10 to the 20th/sq cm above the main gaseous disk. This value is defined by dust opacity and corresponds to a normal dust-to-gas ratio with cosmic abundances. The maximum height reached by the photolevitated clouds depends on the radiation field and dust-to-gas ratios. Clouds located above luminous stellar clusters or near spiral arms with intense star formation can reach several hundred parsecs in height.

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