He I 10830 emission in Seyfert galaxies and QSOs

Astronomy and Astrophysics – Astronomy

Scientific paper

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Helium, Infrared Astronomy, Quasars, Seyfert Galaxies, Cosmic Gases, H Alpha Line, Lyman Alpha Radiation, Nebulae, Spectral Energy Distribution

Scientific paper

He I line fluxes at 10830 A are reported for eight type-1 Seyfert galaxies, three QSOs and two type-2 Seyfert galaxies. The data are combined with He I line fluxes at 5876 A in order to obtain the ratio 10830/5876. The He I flux values resulting from this ratio are compared to fiducial values measured in gaseous nebulae. It is found that the values for gaseous nebulae are very similar to values observed in type-2 Seyfert galaxies, but are considerably larger than He I line flux values for type-1 Seyfert galaxies and QSOs. The data indicate the presence of high dust reddening and powerful optical depth effects in the type-2 Seyfert galaxies.

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