Spectral variations of Markarian 335

Astronomy and Astrophysics – Astronomy

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Astronomical Spectroscopy, Emission Spectra, Line Spectra, Periodic Variations, Seyfert Galaxies, Balmer Series, Optical Density, Oxygen Ions, Resonance Fluorescence, Resonance Lines

Scientific paper

Mrk 335 is found to be a variable Seyfert 1 galaxy whose continuum, emission lines and 3000-A bump have varied over a two-year period (1974 to 1976). While these observations seem consistent with the existence of some optical depth in the lower-series Balmer lines, they may also indicate that the Balmer continuum is optically thin, to account for the Balmer line variations and the 3000-A bump. Additional contributions to the bump may come from the Bowen resonance-fluorescence O III lines.

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