The optical-ultraviolet continuum of Seyfert 2 galaxies

Details The optical-ultraviolet continuum of Seyfert 2 galaxies The optical-ultraviolet continuum of Seyfert 2 galaxies

2000-01-16

arxiv.org/abs/astro-ph/0001278v1

Astronomy and Astrophysics

Astrophysics

26 pages, LaTeX (including 5 Tables) + 17 PostScript figures. To appear in "The Astrophysical Journal"

Scientific paper

10.1086/308886

This paper aims to understand the continuum of Seyfert 2 galaxies. By fitting the single galaxies in the sample of Heckman et al. (1995) with composite models (shock+ photoionization from the active center), we show that five main components characterize the SED of the continuum. Shocks play an important role since they produce a high temperature zone where soft X-rays are emitted. We show that in the optical-UV range, the slope of the NLR emission reproduces the observed values, and may be the main component of the featureless continuum. The presence of star forming regions cannot be excluded in the circumnuclear region of various Seyfert galaxies. An attempt is made to find their fingerprints in the observed AGN spectra. Finally, it is demonstrated that multi-cloud models are necessary to interpret the spectra of single objects, even in the global investigation of a sample of galaxies.

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