An ionization gradient across the front in M17 SW

Details An ionization gradient across the front in M17 SW An ionization gradient across the front in M17 SW

Dec 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...275..130l&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 275, Dec. 1, 1983, p. 130-134.

Astronomy and Astrophysics

Astronomy

8

Infrared Stars, Ionized Gases, Molecular Clouds, Radio Sources (Astronomy), H Ii Regions, O Stars, Photoionization, Point Sources

Scientific paper

Measurements of forbidden Ne II lines at 12.8 microns and forbidden S IV at 10.5 microns are presented along a line through and perpendicular to the ionization front in M17 SW. These observations give evidence for ionization stratification within the front, with the most highly ionized material lying toward the east, opposite to the peak molecular emission and far-IR flux. This result supports the picture of M17 SW as a region where a molecular cloud is heated externally. The ionization equilibrium within the ridge and the nebular energetics suggest that the M17 H II region is largely excited by one or more nearby early O stars. The properties of the recently discovered radio point source in M17 are discussed.

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