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- W2060169439 abstract "Radiation fields emitted by O, B-type stars or young stellar populations (SPs) are generally considered as significant central ionizing sources (CISs) of classic H II regions. In our previous studies, we show that the inclusion of binary interactions in stellar population synthesis models can significantly increase the ultraviolet spectrum hardness and the number of ionizing photons of intermediate-age (IA, 7<~log(t/yr)<~8) SPs. In this work, we present photoionization models of H II regions ionized by radiation fields emitted by IA SPs, and show that radiation fields of IA SPs, including binary systems, are in theory possible candidates of significant CISs of classic H II regions. When radiation fields of IA SPs comprising binary systems are used as the CISs of classic H II regions, the theoretical strengths of a number of lines (such as [O III]4959', [S II]6716', etc.), weaker than observations, are raised; the border /selection-criterion lines, between star-forming galaxies and AGNs in the diagnostic diagrams (for example, [N II]6583/Ha~[O III]5007/Hb), move into the region occupied originally by AGNs; and He II 1640 line, observed in Lyman break and high-redshift gravitationally lensed galaxies, also can be produced." @default.
- W2060169439 created "2016-06-24" @default.
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- W2060169439 date "2014-11-29" @default.
- W2060169439 modified "2023-09-27" @default.
- W2060169439 title "Radiation fields of intermediate-age stellar populations with binaries as ionizing sources of H ii regions" @default.
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- W2060169439 doi "https://doi.org/10.1093/mnrasl/slu170" @default.
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