Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000mnras.318..493c&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 318, Issue 2, pp. 493-500.
Astronomy and Astrophysics
Astronomy
20
Galaxies: Active, Bl Lacertae Objects: General, Galaxies: Jets, Galaxies: Nuclei, Galaxies: Photometry
Scientific paper
We consider archival ROSAT and Hubble Space Telescope (HST) observations of five FR I radio galaxies and isolate their nuclear emission from that of the host galaxy. This enables us to determine the spectral energy distributions (SEDs) of their nuclei spanning the region 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 infrared (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 compared with those of BL Lacs, once the effects of beaming are properly taken into account. FR I SEDs are thus qualitatively similar to those of BL Lacs, supporting the identification of FR I sources as their misoriented 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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