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The Excitation Mechanism of Metastable Levels and Variability of Oxygen Forbidden Lines 4959+5007 Å [OIII] in the Seyfert Nuclei

Published online by Cambridge University Press:  04 August 2017

V. I. Pronik  and
I. I. Pronik
V. I. Pronik
Affiliation:
Crimean Astrophysical Observatory 334413 p/o Nauchny, Crimea, USSR
I. I. Pronik
Affiliation:
Crimean Astrophysical Observatory 334413 p/o Nauchny, Crimea, USSR

Abstract

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In high density gas n(H) ~ 107cm−3 the electron impact and charge transfer OIV+HI→OIII+HII secure high emissivity of gas in [OIII] lines only with low hydrogen and helium ionization, when ne~ n(OIII) ~ 106−107 cm−3. Such condition is possible in HI-zones where oxygen is ionized by soft X-ray (Auger effect). It is shown, that the observed luminosity of NGC 1275 nucleus in 4959+ 5007 Å [OIII] lines can be explained by the electron impact in gas with hydrogen concentration n(H) ~ 1012 cm−3 and does not contradict to a possibility of lines variations within several days.

Type
IV. Variability
Information
Symposium - International Astronomical Union , Volume 121: Observational Evidences of Activity of Galaxies , 1987 , pp. 227 - 233
Copyright
Copyright © Reidel 1987 

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