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The Starburst model for the optical variability of the Seyfert 1 galaxies NGC 4151 and NGC 5548

Aretxaga, Itziar; Terlevich, Roberto

In the frame of the Starburst model, we show that the stellar processes expected to occur during the evolution of a metal rich massive stellar cluster can reproduce the observed optical light curves of the Seyfert 1 galaxies NGC 4151 and NGC 5548.

A Thick Reflection Nebula Illuminated by a Power Law

Binette, Luc; Martin, Peter; Magris C., Gladis

We present the results of modelling the energy distribution of a power law reflected by a dusty cloud. We explore in a fully consistent manner the case in which the reflecting nebula is of considerable optical depth. We apply the model to the observations of the detached emission line cloud at 8 kpc from the nucleus of Pks 2152-69 for whichcontinu…

X-Ray Ultraviolet and Far Infrared Emission of Seyfert Galaxies

Mas-Hesse, J. M.; Rodriguez-Pascual, P. M.; Mirabel, I. F. +3 more

We have compiled multiwavelength data (in the radio, FIR, optical, UV and X-ray ranges) for a sample of 126 galaxies, including QSO, Seyfert 1, Seyfert 2 and galaxies dominated by star-forming processes. We have tested the implications of "unified Seyfert models", which assume that Seyfert 1 and 2 galaxies are intrinsically the same kind of object…

The Ultraviolet Spectrum of the Binary System Ty-Pyxidis

Danezis, E.; Theodossiou, E.; Antonopoulou, E.

A detailed list and analysis of line identifications of five UV spectra of the RS CVn-type binary system TY Pyxidis are presented. These spectra are recorded at different phases with the International Ultraviolet Explorer (IUE). Two of them are in the wavelength rangeλλ1235–1950 Å while the other three in the rangeλλ2700–3110 Å. The far-UV spectru…