Variations in the spectrum of the Seyfert Galaxy AK 120

Details Variations in the spectrum of the Seyfert Galaxy AK 120 Variations in the spectrum of the Seyfert Galaxy AK 120

Nov 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a...103..216s&link_type=abstract

Astronomy and Astrophysics, vol. 103, no. 2, Nov. 1981, p. 216-219. Research supported by the Alexander von Humboldt-Stiftung.

Astronomy and Astrophysics

Astrophysics

17

Astronomical Spectroscopy, Emission Spectra, Line Spectra, Periodic Variations, Seyfert Galaxies, Galactic Nuclei, H Beta Line, Oxygen Spectra, Photoionization, Spectral Energy Distribution

Scientific paper

The intensity ratio of the emission lines (OIII) lambda 5007 and H beta decreased strongly within the 13 months between November 1978 and December 1979. Variations of line profiles and equivalent widths have also been observed. The physical conditions in the emission line region and the relevant time scales are discussed. It is concluded that the observed line changes are most likely caused by variations of the photoionizing flux.

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