The S 140/L 1204 complex: radio recombination lines of hydrogen, carbon and sulphur.

Details The S 140/L 1204 complex: radio recombination lines of hydrogen, carbon and sulphur. The S 140/L 1204 complex: radio recombination lines of hydrogen, carbon and sulphur.

Aug 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...300..923s&link_type=abstract

Astronomy and Astrophysics, v.300, p.923

Astronomy and Astrophysics

Astrophysics

10

Ism: Atoms, Ism: Clouds, Ism: H Ii Regions, Ism: Individual Objects: S 140, Ism: Individual Objects: L 1204, Radio Lines: Interstellar

Scientific paper

We have used the Effelsberg 100-m telescope to observe the hydrogen and carbon 165α and 166α radio recombination lines towards the S 140/L 1204 complex. In addition to the transitions known from earlier observations, we detect a feature due to ionized sulphur. On the basis of the observed H line parameters, we conclude that the emission nebula S 140 is only a part of a larger partially obscured H II region which has an electron temperature of 6400K and an electron density of order 10cm^-3^. The obscured fraction of the H II region appears to be either behind or partially immersed in the molecular and C II regions. We derive parameters for the C II region by combining our results with measurements of the C II 158μm fine structure line by Boreiko et al. (1990) and conclude that the temperature is in the range 75-200K whereas the electron density is in the range 0.5-9cm^-3^. If there is pressure equilibrium between H II and C II gas, then the lower values of the temperature and density are preferable.

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