Comparison of H II region luminosities with observed stellar ionizing sources in the Large Magellanic Cloud | Zendy

M. S. Oey | Zendy; R. C. Kennicutt | Zendy

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Comparison of H II region luminosities with observed stellar ionizing sources in the Large Magellanic Cloud

Author(s) -

M. S. Oey,

R. C. Kennicutt

Publication year - 1997

Publication title -

monthly notices of the royal astronomical society

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.058

H-Index - 383

eISSN - 1365-8711

pISSN - 0035-8711

DOI - 10.1093/mnras/291.4.827

Subject(s) - physics , astrophysics , galaxy , photoionization , ionization , stars , ionizing radiation , luminosity , large magellanic cloud , astronomy , h ii region , star formation , radiation , irradiation , nuclear physics , ion , quantum mechanics

We estimate the total predicted Lyc emission rates of OB associations forwhich the complete census of O star spectral types exists. The results arecompared to the observed H-alpha luminosities of the host H II regions. We findevidence for substantial leakage of ionizing photons from some H II regions,while others appear to be radiation bounded. We estimate that overall for theLMC, 0-51% of the ionizing radiation escapes the local nebulae, and would beavailable to ionize the diffuse, warm, ionized medium (WIM) in that galaxy.This range of values is consistent with the observed 35% fraction of \Ha\luminosity emitted by the WIM in the LMC, as well as the correspondingfractions observed in other nearby galaxies. It is therefore possible thatphotoionization by O stars is indeed the dominant ionization mechanism for theWIM.

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