Radio recombination line observations of the ionized gas in the Galactic Center

Details Radio recombination line observations of the ionized gas in the Galactic Center Radio recombination line observations of the ionized gas in the Galactic Center

Dec 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978phdt........12r&link_type=abstract

Ph.D. Thesis Harvard Univ., Cambridge, MA.

Astronomy and Astrophysics

Astronomy

1

Galactic Radiation, Interstellar Radiation, Ionized Gases, Radio Astronomy, Celestial Mechanics, Helium, Hydrogen, Kepler Laws, Photons, Spectrum Analysis

Scientific paper

The Sgr B2 displayed a He 2 zone with radius about 80% of that of the H 2 zone. This explains the beam-dependent He+/H+ variations. The smaller He 2 zone could be due to preferential absorption of helium-ionizing photons by dust having a smoothly increasing absorptivity shortward of 912 Angstroms. The ionized gas in the extended thermal component is characterized by a low degree of excitation, as indicated by the observed upper limits to the once- and twice-ionized helium abundances. The ionizing agent was favored to be a large number of early B-type stars remaining from a huge burst of star formation that could have occurred at the Galactic Center about 10 to the 7th power years ago.

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