Observations of H166-alpha lines from extended low-brightness H II regions

Details Observations of H166-alpha lines from extended low-brightness H II regions Observations of H166-alpha lines from extended low-brightness H II regions

Jul 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980mnras.192..179p&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 192, July 1980, p. 179-195. Research supported by the National Research

Astronomy and Astrophysics

Astronomy

23

Electron Energy, H Alpha Line, H Ii Regions, Hydrogen Ions, Interstellar Gas, Astronomical Maps, Milky Way Galaxy, Radiative Recombination, Spatial Distribution

Scientific paper

H166-alpha lines are reported from 12 extended, low-density H II regions in the local and Perseus spiral arms. The electron temperatures for such H II regions are in the range 4000-7000 K, and are on average 2000 K less than the electron temperatures of smaller, higher density objects. Electron temperatures of extended, low-density H II regions appear to vary with galactocentric distance. The H166-alpha lines observed in S171 (NGC 7822, W1) do not show evidence for a significant nonthermal component in the source.

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