Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-07-28
New Astron.Rev. 46 (2002) 335-337
Astronomy and Astrophysics
Astrophysics
10 pages, 5 figures, accepted for publication in MNRAS
Scientific paper
10.1016/S1387-6473(01)00203-2
We consider archival ROSAT and HST observations of five FRI radio galaxies and isolate their nuclear emission from that of the host galaxy. This enable us to determine the Spectral Energy Distributions (SED) of their nuclei spanning from the radio to the X-ray band. They cannot be described as single power-laws but require the presence of an emission peak located between the IR and soft X-ray band. We found consistency between the SED peak position and the values of the broad band spectral indices of radio galaxies with those of BL Lac, once the effects of beaming are properly taken into account. FRI SED are thus qualitatively similar to those of BL Lacs supporting the identification of FRI sources as their mis-oriented counterparts. No dependence of the shape of the SED on the FR~I orientation is found.
Capetti Alessandro
Celotti Annalisa
Chiaberge Marco
Feretti Luigina
Trussoni Edoardo
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