Optical and millimeter-wave observations of the M8 region

Details Optical and millimeter-wave observations of the M8 region Optical and millimeter-wave observations of the M8 region

Jan 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...203..159l&link_type=abstract

Astrophysical Journal, vol. 203, Jan. 1, 1976, pt. 1, p. 159-168.

Astronomy and Astrophysics

Astronomy

65

Carbon Monoxide, Interstellar Matter, Light Emission, Millimeter Waves, Nebulae, Radio Astronomy, Absorption Spectra, Brightness Temperature, Emission Spectra, H Ii Regions, Infrared Radiation, Radial Velocity, Radiation Sources

Scientific paper

Millimeter-wave observations made toward the NGC 6530-M8 star-forming complex are compared with high-quality optical interference-filter photographs of that region. Extensive CO observations reveal a large molecular cloud in this direction, within which three bright spots of CO emission are found. Two bright spots are associated in angle with prominent optical features. One of these is coincident with the star Herschel 36 and the Hourglass Nebula; the second appears coincident in angle with an ionization front southeast of Herschel 36. The kinematics of the molecular cloud is studied. The radial velocity of CO emission is found to vary smoothly across the cloud, but it is difficult to interpret this in terms of coherent mass motion of the entire cloud. Analyses of CO, radio-continuum, and optical data indicate that Herschel 36 is the most likely ionizing source for most of the M8 II region. Comparison of optical and radio observations suggests a geometrical model for the region, which places the H II region at the front edge of the molecular cloud. Further considerations indicate that the M8 molecular cloud, the M8 H II region, the young cluster NGC 6530, and the Sgr OB1 association appear to be related in a geometrical evolutionary sequence with cloud evolution, and possibly star formation, proceeding inward with time from the position of the foreground star cluster to the position of the molecular cloud.

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