Optical spectroscopy and narrow-band images of the variable Seyfert 1 galaxy NGC 3783

Details Optical spectroscopy and narrow-band images of the variable Seyfert 1 galaxy NGC 3783 Optical spectroscopy and narrow-band images of the variable Seyfert 1 galaxy NGC 3783

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...393...98w&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 393, no. 1, July 1, 1992, p. 98-112. Research supported by CNPq, FINEP, and

Astronomy and Astrophysics

Astrophysics

19

Astronomical Spectroscopy, Emission Spectra, Galactic Clusters, H Alpha Line, Seyfert Galaxies, Variable Stars, Charge Coupled Devices, Light Curve, Oxygen

Scientific paper

Ten new optical spectra are used to study the variability of the continuum and emission lines in NGC 3783. The contribution of the bulge stellar population to the nuclear spectrum is determined for each epoch and subtracted. The remaining optical continuum is then decomposed into two variable components, and after these components have been subtracted, the resultant spectra, constituted by pure line emission, are analyzed. It is found that the high-excitation gas in the galaxy is very concentrated, while the low-excitation gas is more extended and elongated in a direction perpendicular to the bar of the galaxy. The gas in the central regions is ionized by the central source continuum, but the emission in the ring is ionized by hot stars. The absence of gas emission along the bar suggests that its light is mainly due to old stars. A multiple Gaussian component model is found to describe the emission lines on the various spectra, and four main emission regions with different structure and physical conditions are isolated. The variations in the continuum and emission-line fluxes are analyzed and the relations between them pointed out.

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