General statistics and principal component analysis of multiwavelength properties of Seyfert galaxies.

Astronomy and Astrophysics – Astrophysics

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Galaxies: Seyfert, Methods: Statistical

Scientific paper

We present a statistical study including principal component analysis (PCA) of multiwavelength properties of types 1 and 2 Seyfert galaxies. We have applied PCA to an ensemble of X-ray, optical, near and far infrared, and radio data of Seyfert galaxies. We used Lipovetsky et al. (1987) catalog which provides the largest list of Seyfert galaxies with multiwavelength data. Our main result is that the Spectral Energy Distribution (SED) of Seyfert 1 galaxies is well accounted by one and only one underlying variable, at least to a first approximation. On the other hand, in the case of Seyfert 2 galaxies, at least three variables are required. Several details of the analysis lead us to the following interpretation of this result: In the case of Seyfert 1 galaxies, the main process at the origin of radiation is the release of energy of gravitational origin by accretion unto a supermassive black hole. In the case of Seyfert 2 galaxies, there are other important processes apart from energy of gravitational origin, which we may identify with stellar and interstellar radiation (mainly dust absortion and re-emission) from the circumnuclear region. In the framework of this interpretation the analysis reveals that the variance in luminosity related to radiation of stellar/interstellar origin in no case exceeds ~13% for Seyfert 1 galaxies. In contrast, for Seyfert 2 galaxies the radiation of stellar/interstellar origin can account for ~46% of the variance in certain luminosities.

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