Journal
ASTRONOMICAL JOURNAL
Volume 121, Issue 1, Pages 399-407Publisher
UNIV CHICAGO PRESS
DOI: 10.1086/318017
Keywords
HII regions; ISM : individual (NGC 1976, NGC 1977); radio continuum; reflection nebulae
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We have imaged the large-scale radio continuum structure in the Orion region with the Very Large Array at 330 MHz. Arcminute-resolution morphology of the extended emission in the H II regions M42 and M43 (NGC 1976 and NGC 1982) and in the NGC 1973-75-77 nebulosity to the north are presented. A low surface brightness thermal radio halo is detected in the H II region M42: comparison with an optical photograph indicates that the radio emission distinguishes optical emission structures from reflection nebulosities. In NGC 1977 we have discovered a compact, steep-spectrum radio source coincident with a bright optical rim.
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