Temporal variations of the Balmer line profiles in the spectrum of the Seyfert 1 galaxy Arakelian 120

Details Temporal variations of the Balmer line profiles in the spectrum of the Seyfert 1 galaxy Arakelian 120 Temporal variations of the Balmer line profiles in the spectrum of the Seyfert 1 galaxy Arakelian 120

Nov 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...250..508f&link_type=abstract

Astrophysical Journal, Part 1, vol. 250, Nov. 15, 1981, p. 508-512.

Astronomy and Astrophysics

Astrophysics

22

Astronomical Spectroscopy, Balmer Series, H Lines, Seyfert Galaxies, Spectral Line Width, Temporal Distribution, Galactic Nuclei, H Alpha Line, H Beta Line

Scientific paper

Observations of the emission-line strengths and the Hα and Hβ line profiles in the spectrum of the Seyfert 1 galaxy Arakelian 120 have been obtained with the Ohio State University image-dissector scanner. Comparison of these data with observations of comparable resolution and quality obtained with the Lick Observatory image-dissector scanner show that a dramatic change occurred in the Hβ profile between 1976 November and 1981 January. A change of the same sense is observed in Hα to a lesser extent, implying that the Balmer decrement of the component which has apparently brightened is less steep than that of the total line emission. The changes in the emission-line profiles were accompanied by decreases in both the Hα and Hβ equivalent widths and in the [O III] λ5007/Hβ flux ratio. The latter variations imply that the broad lines have increased in strength in response to an increase in the luminosity of the continuum source.

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