On the ionizing agent of the extended thermal component in the galactic center

Details On the ionizing agent of the extended thermal component in the galactic center On the ionizing agent of the extended thermal component in the galactic center

Aug 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...231..697r&link_type=abstract

Astrophysical Journal, Part 1, vol. 231, Aug. 1, 1979, p. 697-701.

Astronomy and Astrophysics

Astronomy

5

B Stars, Galactic Nuclei, Ionized Gases, Microwave Spectra, Radio Astronomy, Radio Sources (Astronomy), Helium, Hydrogen Clouds, Line Spectra, O Stars, Stellar Evolution, Thermodynamic Equilibrium

Scientific paper

Observations of radio recombination lines at 3.3 GHz are used to confirm that the ionized gas in the extended thermal component of the galactic center is close to local thermodynamic equilibrium at microwave frequencies and to discuss the nature of its ionizing agent. The low degree of excitation implied by the observations suggests that the most probable source of ionization is a large number (about 10,000) of early B-type stars remaining from a huge burst of star formation that may have occurred some 10 million years ago at the galactic center.

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