The fading of the Seyfert galaxy F-9

Details The fading of the Seyfert galaxy F-9 The fading of the Seyfert galaxy F-9

May 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...146l..11k&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 146, no. 1, May 1985, p. L11-L14. Sponsorship: Deutsche Forschungsgemeinschaft

Astronomy and Astrophysics

Astrophysics

24

Astronomical Spectroscopy, Fading, Seyfert Galaxies, Balmer Series, H Beta Line, Iron, Photoionization, Ultraviolet Spectra

Scientific paper

In view of the amplitude of its H-beta variation, the Seyfert galaxy F-9 is one of the most strongly variable known. Most of this change occurred within the last three years, and has taken the classification of F-9 from that of a very strong Seyfert 1 to nearly Seyfert 2 status. The continuum, broad emission, and Fe II lines are noted to vary in relation to one another, and may be quantitatively understood in terms of recent, detailed photoionization calculations.

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