Please use this identifier to cite or link to this item:
http://hdl.handle.net/2289/1627
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). |
URI: | http://hdl.handle.net/2289/1627 |
ISSN: | 0004-6361 |
Alternative Location: | http://arxiv.org/abs/astro-ph/0209133 http://dx.doi.org/10.1051/0004-6361:20021302 |
Copyright: | (2002) by the European Southern Observatory (ESO). |
Appears in Collections: | Research Papers (A&A) |
Files in This Item:
File | Description | Size | Format | |
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2002 A&A V395 227p..pdf | 6p. | 1.25 MB | Adobe PDF | View/Open |
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