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Title: Multi-frequency GMRT observations of the H II regions S 201, S 206, and S 209. Galactic temperature gradient
Authors: Omar, A.
Chengalur, J.N.
Roshi, Anish D.
Keywords: ISM: HII regions
ISM: individual objects: S 201, S 206, S 209 – radio continuum: ISM
Issue Date: Nov-2002
Publisher: EDP Sciences
Citation: Astronomy and Astrophysics, 2002, Vol.395, p227-232
Abstract: We present radio continuum images of three Galactic H Ii regions, S 201, S 206, and S 209 near 232, 327, and 610 MHz using the Giant Meterwave Radio Telescope (GMRT). The GMRT has a mix of short and long baselines, therefore, even though the data have high spatial resolution, the maps are still sensitive to diffuse extended emission. We find that all three H Ii regions have bright cores surrounded by diffuse envelopes. We use the high resolution afforded by the data to estimate the electron temperatures and emission measures of the compact cores of these H Ii regions. Our estimates of electron temperatures are consistent with a linear increase of electron temperature with Galacto-centric distance for distances up to ~ 18 kpc (the distance to the most distant H Ii region in our sample).
ISSN: 0004-6361
Alternative Location:
Copyright: (2002) by the European Southern Observatory (ESO).
Appears in Collections:Research Papers (A&A)

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