HST observations of FR I radiogalaxies: what do they tell us about the BL Lac - FR I unification scheme?

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dc.creatorChiaberge, Marco
dc.creatorCelotti, Annalisa
dc.creatorCapetti, Alessandro
dc.creatorGhisellini, Gabriele
dc.date2000-07-25
dc.date.accessioned2026-07-07T01:54:32Z
dc.date.available2026-07-07T01:54:32Z
dc.descriptionWe explore the viability of the unification of BL Lacs and FR I radio galaxies by comparing the core emission of radio galaxies with those of BL Lacs, taking advantage of the newly measured optical nuclear luminosity of FR I sources. The spectral properties of complete samples are studied in the radio-optical luminosity plane: we calculate the predicted luminosity of BL Lacs when observed off-axis, in the frame of a simple one-zone model. We find that the bulk Lorentz factors required in order to account for the observed luminosities are significantly smaller than those implied by other, both observational and theoretical, considerations. In order to reconcile these results with the unification scheme, velocity structures in the jet are suggested, where a fast spine is surrounded by a slower layer.
dc.description3 pages, 2 figures, proc. 4th Italian Meeting on AGN "AGN nel 2000", Trieste, May 15-18, 2000, to be published in Mem. SAIt. Uses memsait.sty, included
dc.identifierhttps://arxiv.org/abs/astro-ph/0007378
dc.identifierhttp://arxiv.org/abs/astro-ph/0007378
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/1388
dc.subjectAstrophysics
dc.titleHST observations of FR I radiogalaxies: what do they tell us about the BL Lac - FR I unification scheme?
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