330-MHz radio continuum imaging of the W51 complex

Details 330-MHz radio continuum imaging of the W51 complex 330-MHz radio continuum imaging of the W51 complex

Aug 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995mnras.275..755s&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 275, Issue 3, pp. 755-763.

Astronomy and Astrophysics

Astronomy

17

Hii Regions, Ism: Individual: W51, Supernova Remnants, Radio Continuum: Ism

Scientific paper

We present a 1.1-arcmin-resolution image of the W51 complex made with the Very Large Array at a frequency of 330 MHz. W51A and W51B are resolved into multiple components at metre wavelengths for the first time: most of the compact components have spectra that are self-absorbed at this low observing frequency and these components appear surrounded by thermal plasmas with low emission measures. We estimate the electron temperature towards the brightest subcomponent of W51A (G49.5-0.4e) to be <~7500K. This temperature estimate is consistent with inferences from observations of radio recombination lines from the HII region: there is no evidence in our image for a radial temperature decrement within the subcomponent.

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