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1990•Monthly Notices of the Royal Astronomical SocietyRequires access

Spectral variations in the broad-line region of NGC 6814

K. Sekiguchi, J. W. Menzies

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Abstract

Summary We present optical spectroscopy of the Seyfert galaxy NGC 6814 obtained at the SAAO over a two-year period from 1983 May to 1985 October. During this period, the spectrum changed from Seyfert 1 to more closely resemble that of Seyfert 1.8-1.9. The Hβ flux decreased by more than a factor of 2 within two months. The decrease in the broad Balmer emission line strength was coupled with a decrease in the X-ray output.

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Summary We present optical spectroscopy of the Seyfert galaxy NGC 6814 obtained at the SAAO over a two-year period from 1983 May to 1985 October. During this period, the spectrum changed from Seyfert 1 to more closely resemble that of Seyfert 1.8-1.9. The Hβ flux decreased by more than a factor of 2 within two months. The decrease in the broad Balmer emission line strength was coupled with a decrease in the X-ray output.

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Available abstract

Summary We present optical spectroscopy of the Seyfert galaxy NGC 6814 obtained at the SAAO over a two-year period from 1983 May to 1985 October. During this period, the spectrum changed from Seyfert 1 to more closely resemble that of Seyfert 1.8-1.9. The Hβ flux decreased by more than a factor of 2 within two months. The decrease in the broad Balmer emission line strength was coupled with a decrease in the X-ray output.

Key concepts: Physics, Astrophysics, Flux (metallurgy), Line (geometry), Astronomy, Spectral line, Emission spectrum, Line width

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