Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pasp..103..911s&link_type=abstract
(Rice University and University of Texas, Texas-Mexico Conference on Astrophysics: Plasmas in Astrophysics, 3rd, Rice University
Astronomy and Astrophysics
Astrophysics
10
Galactic Radiation, Interstellar Gas, Photoionization, Ultraviolet Radiation, B Stars, H Alpha Line, O Stars
Scientific paper
The photoionization of diffuse, high-latitude gas in NGC 891 by the UV radiation from various in situ stellar populations was modeled. It is found that, although OB stars dominate the production of stellar UV photons, models using only OB stars cannot reproduce the observed N II forbidden-line 6584/H-alpha ratios seen throughout this diffuse ionized medium (DIM). Models that combine OB stars with the high-temperature end of the white-dwarf distribution and the central stars of planetary nebulae are capable of reproducing the observed N II forbidden-line 6584/H-alpha ratios. Estimation of ionizing photon fluxes, using fee-free and infrared emission, combined with these models requires the filling factor throughout the DIM in NGC 891 to be of order 0.01 and that white dwarfs and planetary nebula central stars contribute about 25 percent of the ionizing photons at z = 250 pc. The model results indicate that the filling factor of the DIM in the Milky Way is approximately 0.1, in agreement with previous estimates.
Bland-Hawthorn Jonathan
Sokolowski James
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