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Nuclear Spectral Energy Distribution of NGC 6251: A BL Lacertae Object in the Center of an FR I Radio Galaxy (Articolo in rivista)

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Nuclear Spectral Energy Distribution of NGC 6251: A BL Lacertae Object in the Center of an FR I Radio Galaxy (Articolo in rivista) (literal)

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Chiaberge M., Gilli R., Capetti A,. Macchetto, F. D. (2003)
Nuclear Spectral Energy Distribution of NGC 6251: A BL Lacertae Object in the Center of an FR I Radio Galaxy
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Titolo

Nuclear Spectral Energy Distribution of NGC 6251: A BL Lacertae Object in the Center of an FR I Radio Galaxy (literal)

Abstract

We determine the nuclear spectral energy distribution (SED) from the radio to the gamma-ray band for the FR I radio galaxy NGC 6251, by using data from the literature and analyzing Hubble Space Telescope and X-ray archival data. In the log¦Í-log(¦ÍF¦Í) representation, the SED has two broad peaks, and it is remarkably similar to those of blazars. We show that the low-energy peak can be explained in terms of synchrotron radiation, while the high-energy peak is most plausibly produced by inverse Compton scattering. This brings direct support to the FR I-BL Lac unification model. We model the overall emission in the frame of a synchrotron self-Compton scenario, which well describes the SED of BL Lac objects. The model parameters that we obtain also quantitatively confirm the FR I-BL Lac unification model and imply a rather small viewing angle to this source (&thetas;<~20deg). NGC 6251 is the second radio galaxy, in addition to Centaurus A, for which a similar analysis has been performed. A significant improvement with respect to the case of Cen A is the absence of obscuration in NGC 6251, which strengthens the overall result. (literal)

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