The nuclei of 3CR radio galaxies in the UV

Details The nuclei of 3CR radio galaxies in the UV The nuclei of 3CR radio galaxies in the UV

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...19916113c&link_type=abstract

American Astronomical Society, 199th AAS Meeting, #161.13; Bulletin of the American Astronomical Society, Vol. 34, p.574

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Scientific paper

We have studied the nuclei of 28 radio galaxies from the 3CR sample in the UV band. Unresolved nuclei (central compact cores, CCC) are observed in 10 of the 13 FR I, and in 5 of the 15 FR II. We have measured optical--UV spectral indices α o,UV between ~ 0.6 and ~ 7.0 (Fν ν -α ). BLRG have the flattest spectra and their values of α o,UV are also confined to a very narrow range. This is consistent with radiation produced in an geometrically thin, optically thick accretion disk. On the other hand, FR I nuclei, which are most plausibly originated by synchrotron emission from the inner relativistic jet, show a wide range of α o,UV. There is a clear trend with orientation (the steepest spectra are associated with sources observed almost edge-on or with clear signs of dust absorption). These observations imply that obscuration in FR I is present, but the obscuring material is not in a ``standard'' geometrically thick torus. The most striking difference between these absorbing structures and the classic AGN ``tori'' resides in the lower optical depth of the FR I obscuring material.

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