2002A&A...395..227O


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.26CET23:12:34

2002A&A...395..227O - Astronomy and Astrophysics, volume 395, 227-232 (2002/11-3)

Multi-frequency GMRT observations of the HII regions S 201, S 206, and S 209. Galactic temperature gradient.

OMAR A., CHENGALUR J.N. and ROSHI D.A.

Abstract (from CDS):

We present radio continuum images of three Galactic HII regions, S 201, S 206, and S 209 near 232, 327, and 610MHz 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 HII 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 HII 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 HII region in our sample).

Abstract Copyright:

Journal keyword(s): ISM: HII regions - ISM: individual objects: S 201, S 206, S 209 - radio continuum: ISM

Simbad objects: 3

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Number of rows : 3

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 SH 2-201 HII 03 03 17.9 +60 27 52           ~ 112 0
2 NGC 1491 HII 04 03 15.9 +51 18 54           ~ 107 1
3 SH 2-209 HII 04 11 06.7 +51 09 44           ~ 91 0

    Equat.    Gal    SGal    Ecl

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2020.10.26-23:12:34

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