Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...448..727o&link_type=abstract
Astrophysical Journal v.448, p.727
Astronomy and Astrophysics
Astronomy
7
Ism: H Ii Regions, Radio Lines: Ism
Scientific paper
We report the results of a survey for H168α recombination lines emanating from cold gas in the vicinity of Galactic H II regions. We observed seven H II regions at 22 cm using the Arecibo radio telescope. Two of the nebulae (NRAO 584 and K3-50) exhibited narrow lines from cold hydrogen (H0) in photodissociation regions outside their Strömgren spheres, and all seven objects exhibited narrow carbon (C+) recombination lines. We have combined the new data with observations from the literature and find that, for the six H II regions where both H0 and C+ have been detected, there is a strong correlation between the normalized intensities of the carbon and hydrogen recombination lines. We conclude that the excitation conditions in the partially ionized carbon and hydrogen gas are the same and that the lines are amplified by stimulated emission. The blister model predicts a correlation between the recombination line velocity shifts and their intensities. We find that prediction to be inconsistent with our data.
Onello Joseph S.
Phillips Adrienne J.
No associations
LandOfFree
Radio Recombination Line Observations of Partially Ionized Gas in Galactic H II Regions does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Radio Recombination Line Observations of Partially Ionized Gas in Galactic H II Regions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Radio Recombination Line Observations of Partially Ionized Gas in Galactic H II Regions will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1268949