Aperture synthesis observations of galactic H II regions. V - The galactic nebula S 252 /NGC 2175/

Details Aperture synthesis observations of galactic H II regions. V - The galactic nebula S 252 /NGC 2175/ Aperture synthesis observations of galactic H II regions. V - The galactic nebula S 252 /NGC 2175/

Jul 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....59...43f&link_type=abstract

Astronomy and Astrophysics, vol. 59, no. 1, July 1977, p. 43-52.

Astronomy and Astrophysics

Astronomy

44

H Ii Regions, Hydrogen Ions, Interstellar Gas, Nebulae, Radio Astronomy, Astronomical Models, Electron Density (Concentration), Gas Ionization, Rarefied Gases

Scientific paper

Aperture-synthesis observations at 1415 and 4995 MHz and fan-beam observations at 408 MHz of the galactic diffuse nebula NGC 2175 are presented. A comparison of the radio structures with the H-alpha surface-brightness distribution indicates the presence of several thermal components located at the edge of a low-density extended H II region. The main source of ionization is the O6.5 V star HD 42088. The large-scale optical and radio emission is bounded by an ionization front on the west side, while it is density-bounded on the east side. Of the four thermal small-diameter components of higher electron density present in NGC 2175, at least two require an internal source of ionization. An unresolved radio component with no optical counterpart is also found in the central part of the optical nebulosity. Based on its spectral index, the radio source can be classified as extragalactic. A schematical model for the region is derived which agrees with the 'blister' model proposed for Orion, NGC 2024, and S 206.

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