Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993ap%26ss.205...13s&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 205, no. 1, p. 13-18.
Astronomy and Astrophysics
Astrophysics
1
Cosmic Plasma, Galactic Nuclei, Ionizing Radiation, Nuclear Radiation, O Stars, Radiation Distribution, Cool Stars, Photoionization
Scientific paper
The Galactic center contains a low-ionization nebula that has been previously interpreted as plasma photoionized by relatively cool O stars. We consider the possibility that this material is instead ionized by more energetic continua and described by a relatively low ionization parameter (ratio of ionizing photon to nucleon density). We find that the predicted spectrum is more sensitive to the ionization parameter and cloud density than to details of the ionizing continuum shape. The Galactic center spectrum can be generated by stars with a range of temperatures irradiating clouds with multiple components of differing densities. The present calculations also show that optical emission from many LINERs (low-ionization nuclear emission-line regions) can be generated by relatively hot, yet normal O stars embedded in gas clouds similarly characterized by a range of densities.
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