Abstract
Working on the assumption that the emission line filaments associated with radio-galaxies are photoionized, the relative reliability of the He II λ4686/H/β line ratio as a test of the hardness of the continuum ionizing distribution is reviewed. It may provide a useful discriminant for determining whether or not young stars are responsible for exciting the emission line filaments.
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References
Binette,L., Courvoisier,T.J.-L., Robinson, A.: 1987, A & A (in press)
Binette,L., Robinson, A., Courvoisier,T.J.-L.: 1988, submitted to A & A
Binette, L., Dopita, M.A., Tuohy, I.R.: 1985, Ap. J. 297, 476.
Johnstone, R.M., Fabian, A.C., Nulsen,P.E.J.: 1987, Mon. Not. R. astr. Soc. ,224, 75.
Stasinska,G.: 1984, A & A 135, 341.
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© 1988 Kluwer Academic Publishers
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Binette, L. (1988). He II λ4686/Hβ as a Constraint on the Ionizing Continuum. In: Fabian, A.C. (eds) Cooling Flows in Clusters and Galaxies. NATO ASI Series, vol 229. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-2953-1_36
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DOI: https://doi.org/10.1007/978-94-009-2953-1_36
Publisher Name: Springer, Dordrecht
Print ISBN: 978-94-010-7828-3
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