Microwave spectroscopic mapping of gaseous nebulae. II. Observations of hydrogen in NGC 7538
Journal Article
·
· Astrophys. J., v. 183, no. 2, pp. 479-489
The H 94 alpha recombination line is mapped at 12 locations across the galactic H II region NGC 7538. The observed alpha -line paramaters are used to determine some of the physical and kinematic properties of the nebula. The radial-velocity gradient implies a nebular rotation period of ~ 10/sup 7/ years. The LTE electron temperature varies between 7000 deg and increase with distance from the center. The derived electron temperature at this frequency (7.8 GHz) is close to the gas-kinetic temperature, at least in the center of source. Observation of helium, previously undetected in NGC 7538, yields a relative abundance n(He)+/n(H+) ~0.06. (auth)
- Research Organization:
- Harvard College Observatory
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-29-021918
- OSTI ID:
- 4348169
- Journal Information:
- Astrophys. J., v. 183, no. 2, pp. 479-489, Journal Name: Astrophys. J., v. 183, no. 2, pp. 479-489; ISSN ASJOA
- Country of Publication:
- United States
- Language:
- English
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