Aperture synthesis observations of W 51 at 151 MHz

Details Aperture synthesis observations of W 51 at 151 MHz Aperture synthesis observations of W 51 at 151 MHz

May 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.250..127c&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 250, May 1, 1991, p. 127-132. CNPq-supported research.

Astronomy and Astrophysics

Astronomy

16

Astronomical Spectroscopy, H Ii Regions, Radio Astronomy, Radio Sources (Astronomy), Synthetic Apertures, Abundance, Continuous Spectra, Electron Energy, Supernova Remnants, X Ray Sources

Scientific paper

Radio continuum observations at 151 MHz of the galactic H II region complex W51 were made with the Cambridge Low Frequency Synthesis Telescope. The data were used to estimate the electron temperature of G49.5 - 0.4 and G49.4 - 0.3, two of the main components of W51. The values of electron temperature derived from radio continuum observations (about 3500 K) are significantly lower than those obtained from recombination lines (about 6400 K), which indicates the existence of internal variations of electron temperature in these nebulae. The existence of electron temperature gradients in H II regions would have an important effect on the chemical abundance determinations. The nature of the shell-like component W51C, a possible supernova remnant, was also studied. AT 151 MHz, W51C appears very distinctly as a large incomplete shell obviously connected to W51B. This shell is an X-ray source, and no recombination line has been detected from it. A turnover in the spectrum of W51C was found by comparison of the present data with previous observations at higher frequencies.

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