A high-resolution study of M17 at 1.3, 2, 6, and 21 CM

Details A high-resolution study of M17 at 1.3, 2, 6, and 21 CM A high-resolution study of M17 at 1.3, 2, 6, and 21 CM

Jul 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...136...53f&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 136, no. 1, July 1984, p. 53-64.

Astronomy and Astrophysics

Astronomy

121

Astronomical Maps, Centimeter Waves, Molecular Clouds, Nebulae, Radio Sources (Astronomy), H Ii Regions, Hot Stars, Ionized Gases, Radiant Flux Density, Radio Telescopes, Stellar Winds, Synthetic Apertures

Scientific paper

Data from high-resolution observations of M 17 at wavelengths 1.3, 2, 6, and 21 cm obtained with the VLA in April, 1980, September, 1981, and March, 1982, are presented in tables and contour maps and analyzed in detail. The large-scale structure comprises N and S bars of length 5.7 pc, widths 1.0-1.3 and 1.3-1.6 pc, and total integrated 21-cm flux density 95 and 132 Jy, respectively. Four types of small-scale features are identified: 30-solar-mass globs of neutral gas with thin dense ionized envelopes, an arc-shaped ionization front seen almost edge-on at the cloud boundary, a 0.4-arcsec-diameter ultracompact H II region with emission measure 700 Mpc/cm6, (attributed to shock-induced star formation at the H+/H2 interface), and an IR source without radio emission (attributed to a massive optically thick stellar wind).

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