Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002apj...565l..79c&link_type=abstract
The Astrophysical Journal, Volume 565, Issue 2, pp. L79-L82.
Astronomy and Astrophysics
Astronomy
28
Galaxies: Individual: Ngc Number: Ngc 628, Galaxies: Individual: Ngc Number: Ngc 1232, Galaxies: Individual: Ngc Number: Ngc 4258, Galaxies: Ism, Ism: H Ii Regions, Galaxies: Intergalactic Medium, Stars: Wolf-Rayet
Scientific paper
A thorough analysis of well-studied disk giant H II regions, for which we know the ionizing stellar population, gas metallicity, and Wolf-Rayet population, leads to photoionization models that can only match all observed line intensity ratios ([O III], [O II], [N II], [S II], and [S III] with respect to the intensity of Hβ), as well as the Hβ luminosity and equivalent width if one allows for an important escape of energetic ionizing radiation. For the three regions presented here, the fractions of escaping Lyman continuum photons amount to 10%-73%, and in all cases, the larger fraction of escaping photons has energies of between 13.6 and 24.4 eV. These escaping photons clearly must have an important impact as sources of ionization of the diffuse ionized gas found surrounding many galaxies, as well as of the intergalactic medium.
Castellanos Marcelo
Diaz Angeles I.
Tenorio-Tagle Guillermo
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