Radio Recombination Lines toward the S140/L1204

Details Radio Recombination Lines toward the S140/L1204 Radio Recombination Lines toward the S140/L1204

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...185.8204s&link_type=abstract

American Astronomical Society, 185th AAS Meeting, #82.04; Bulletin of the American Astronomical Society, Vol. 26, p.1453

Astronomy and Astrophysics

Astronomy

Scientific paper

We have used the Effelsberg 100-m telescope to observe the hydrogen and carbon 165alpha and 166alpha radio recombination lines towards the S140/L1204 complex. In addition to the transitions known from earlier observations, we detect a feature due to ionized sulphur in the Cii region. On the basis of the observed H line parameters, we conclude that the emission nebula S140 is only a part of a larger partially obscured Hii region which has an electron temperature of 6400 K and an electron density of order 10 cm(-3) . The obscured fraction of the Hii region appears to be either behind or partially immersed in the molecular and Cii regions. We derive parameters for the Cii region by combining our results with measurements of the Cii 158 microns fine structure line and conclude that the temperature is in the range 75--200 K whereas the electron density is in the range 0.5--9 cm(-3) . If there is pressure equilibrium between Hii and Cii gas, then the lower values of the temperature and density are preferable.

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