Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981s%26t....62..225r&link_type=abstract
Sky and Telescope, vol. 62, Sept. 1981, p. 225-227.
Astronomy and Astrophysics
Astronomy
1
Interstellar Matter, Nebulae, Telescopes, Antenna Arrays, Cosmic Dust, H Ii Regions, Infrared Astronomy, Interstellar Gas, Ionized Gases, Molecular Clouds, Orion Nebula, Radio Sources (Astronomy), Radio Telescopes, Stellar Evolution, Very Large Array (Vla)
Scientific paper
The considered investigation is concerned with the Great Nebula (M42) in Orion and the Omega nebula (M17) in Serpens. These emission nebulae appear as bright patches, many arc minutes in size, and show a complex pattern of intensity and color. The nebulae shine because their gas (principally hydrogen) has been excited by the ultraviolet radiation of hot young stars embedded within. Because their hydrogen content is almost completely ionized, these emission nebulae are also called H II regions. Infrared and radio studies have revealed that both M42 and M17, are also associated with dense clouds of gas and dust. These are called molecular clouds and within them stars are still forming. The ionized gas of an H II region also generates continuous radio emission. Radio waves are not obscured by the dust in molecular clouds and thus can be used to probe these pockets of star formation. The Very Large Array (VLA) in NM has been used to study M42, M17, and Monoceros R2. The VLA 6-cm map obtained reveals a wealth of detail in the distribution of radio emission from the optically obscured H II region.
Felli Marcello
Righini-Cohen G.
Simon Manfred
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