Narrow band imagery and spectral variability of NGC 3783

Details Narrow band imagery and spectral variability of NGC 3783 Narrow band imagery and spectral variability of NGC 3783

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aipc..254..576w&link_type=abstract

In: Testing the AGN paradigm; Proceedings of the 2nd Annual Topical Astrophysics Conference, Univ. of Maryland, College Park, Oc

Astronomy and Astrophysics

Astrophysics

H Alpha Line, Imaging Spectrometers, Narrowband, Seyfert Galaxies, Spectral Bands, Emission Spectra, Line Spectra, Spectrum Analysis, Variability

Scientific paper

We present narrow band images centered on forbidden O III 5007 A, H-alpha, and adjacent continua of the Seyfert 1 galaxy NGC 3783. The continuum images evidence that the bar emission is mainly due to old stars. The forbidden O III 5007 A image shows that the high excitation gas is very concentrated, while the H-alpha emission is more extended and elongated perpendicularly to the direction of the bar. Ten new optical spectra, obtained between 1987 and 1990 are used to study the variability of the continuum and emission lines in this galaxy. 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 in two variable components, and a multiple Gaussian components model found in order to describe the different emission lines on the various spectra. The variations on the continuum and emission line fluxes are analyzed, and the relations between them are pointed out.

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