Large-scale dissociation of molecular gas in galaxies by newly formed stars

Details Large-scale dissociation of molecular gas in galaxies by newly formed stars Large-scale dissociation of molecular gas in galaxies by newly formed stars

Jan 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986natur.319..296a&link_type=abstract

Nature (ISSN 0028-0836), vol. 319, Jan. 23, 1986, p. 296-298.

Astronomy and Astrophysics

Astronomy

94

Hydrogen Clouds, Interstellar Gas, Molecular Clouds, Photodissociation, Spiral Galaxies, Stellar Evolution, Galactic Structure, Gas Dissociation, H Lines, Hot Stars, Hydrogen Atoms, Radio Astronomy, Ultraviolet Radiation, Very Large Array (Vla)

Scientific paper

Molecular hydrogen is thought to form from atomic hydrogen on the surface of dust grains in the interstellar medium, and to be dissociated primarily by ultraviolet radiation from hot stars. Observational evidence that molecular hydrogen is indeed dissociated in shells around young OB stars in the Galaxy has been presented recently. The authors present new high-resolution observations of the spiral galaxy M83 both in H I and in the Hβ emission line. These data suggest that the same dissociation process occurs on the kpc scale in active star-forming regions of some galaxies, and that this dissociation may strongly affect the observed morphology of atomic hydrogen in spiral arms.

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