Differences in the Emission Line Spectrum at Maximum and Minimum of the Nuclear Brightness of the Seyfert Galaxy NGC 7469

Details Differences in the Emission Line Spectrum at Maximum and Minimum of the Nuclear Brightness of the Seyfert Galaxy NGC 7469 Differences in the Emission Line Spectrum at Maximum and Minimum of the Nuclear Brightness of the Seyfert Galaxy NGC 7469

May 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996ap%26ss.239...97p&link_type=abstract

Astrophysics and Space Science, Volume 239, Issue 1, pp.97-111

Astronomy and Astrophysics

Astrophysics

4

Scientific paper

We have compiled data on relative intensties, fluxes and profiles of emission lines of the NGC 7469 nuclear spectrum observed in the optical region by many authors during 1966 1986. The aim of our investigation is to reveal differences in the characteristics of the emission lines in maxima and minima of the nuclear brightness. The distinction was revealed for relative intensities, fluxes and profiles. During the extreme maxima profiles ofH γ,H β andH α lines, colour indices of the nucleus and its high level of accretion rate resemble those of QSOs. On the other hand, during the deep minimum 1989 the nucleus had the properties of a Sy2 type. There is a relation between variable fluxes ofH β and [OIII] λ 5007 Å lines which is different for the minima and maxima of the nuclear brightness. The fluxes of the [OIII] λ 5007 Å line during the minima of the nuclear brightness are systematically higher than those in maxima. The above mentioned peculiarities of the emission lines in the NGC 7469 nucleus can be understood in terms of the increase of electron temperature, electron density and velocities of the nuclear gas from minimum to maximum.

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