330-MHz radio continuum observations of the H II regions M42 and M43

Details 330-MHz radio continuum observations of the H II regions M42 and M43 330-MHz radio continuum observations of the H II regions M42 and M43

Jan 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.254..291s&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 254, Jan. 15, 1992, p. 291-294.

Astronomy and Astrophysics

Astronomy

8

H Ii Regions, Orion Nebula, Radio Astronomy, Brightness Distribution, Electron Energy, Very Large Array (Vla)

Scientific paper

A radio-continuum image of the Orion Nebula (M42 and M43) is presented that is made with a resolution of 57 arcsec at a frequency of 330 MHz. At this low frequency, the H II region M42 appears to be asymmetric on all scales exceeding an arcminute, whereas M43 appears to have circular symmetry. The intensity distribution in M42 is flat topped and has a sharp cut-off to the north-east, whereas diffuse emission with a low surface brightness extends to the south and west. Towards the continuum peak of M42 the optical depth is large and the imaging directly measures the electron temperature to be 7865 +/- 360 K, where the uncertainty is the rms error expected.

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