A microwave investigation of the Trifid Nebula and its surrounding environment

Details A microwave investigation of the Trifid Nebula and its surrounding environment A microwave investigation of the Trifid Nebula and its surrounding environment

Aug 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...199..647c&link_type=abstract

Astrophysical Journal, vol. 199, Aug. 1, 1975, pt. 1, p. 647-649, 651-659.

Astronomy and Astrophysics

Astronomy

15

Interstellar Gas, Microwave Emission, Nebulae, Radio Astronomy, Astronomical Maps, Bremsstrahlung, Formaldehyde, Gravitational Collapse, H Ii Regions, Line Spectra, Radiative Recombination

Scientific paper

The M20 gaseous nebula and the nearby environment in which it resides have been studied extensively at microwave wavelengths. New maps of thermal bremsstrahlung radiation are used to delineate the full extent of the ionized gas relative to the partially obscuring matter of an adjacent molecular cloud. Extensive observations of the 110-alpha recombination-line set are combined with the continuum radio emission to estimate several bulk nebular parameters. The distribution of derived nebular properties in many respects shows closer agreement with what is theoretically expected of galactic nebulae than does perhaps any other H II region investigated to date by radio techniques. The surrounding environment is briefly surveyed by means of 18-cm OH absorption, which is shown to peak to the west of the M20 nebula where optical obscuration is strongest. A more comprehensive exploration of the nearby region via the 6-cm H2CO line reveals an extended molecular cloud engulfing the nebula from the south and west. Enclosed within this large cloud is a molecular concentration of considerable mass and density, coincident with a globule of total obscuration, whose kinematic properties strongly suggest gravitational collapse.

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