The H II region G0.18-0.04: ionization of a molecular cloud by impact with a strong magnetic field

Details The H II region G0.18-0.04: ionization of a molecular cloud by impact with a strong magnetic field The H II region G0.18-0.04: ionization of a molecular cloud by impact with a strong magnetic field

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...242..376s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 242, no. 2, Feb. 1991, p. 376-387.

Astronomy and Astrophysics

Astrophysics

58

Galactic Nuclei, H Ii Regions, Interstellar Magnetic Fields, Molecular Clouds, Astronomical Spectroscopy, Emission Spectra, Gas Density, Magnetic Flux, Molecular Gases, Relativistic Particles

Scientific paper

The correlation of the entire length of the G0.18-0.04 H II region with either the main emission ridge of a newly delineated molecular cloud or with its edge indicates that it is likely the ionized leading edge of an ambient molecular cloud which is impinging upon a region of high magnetic field and being decelerated and ionized by the coupling of the preexisting partially ionized cloud component to the field. The morphology and relative kinematics of the molecular and ionized cloud components suggest that the molecular cloud is being deflected around a strong magnetic flux tube, rather than interacting with a large-scale uniform field. The molecular cloud also shows evidence of being stretched along the nonthermal filaments. This suggests that either the relativistic particles present among the filaments are impacting upon and disrupting the molecular cloud, or conversely, that the relativistic particles are produced by the collision of the molecular cloud with a preexisting magnetic flux tube. In the latter case, impulsive particle acceleration as a result of field connection is required.

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