|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'506'133
Articles rated: 2609
27 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
The HST survey of the B2 sample of radio-galaxies: optical nuclei and the FRI/BL Lac unified scheme | | A. Capetti
; A. Celotti
; M. Chiaberge
; H.R. de Ruiter
; R. Fanti
; R. Morganti
; P. Parma
; | | Date: |
6 Dec 2001 | | Subject: | astro-ph | | Affiliation: | 4,5), R. Fanti , R. Morganti , P. Parma (Osservatorio Astronomico di Torino, Italy SISSA/ISAS, Trieste, Italy Space Telescope Science Institute, U.S.A. Osservatorio Astronomico di Bologna, Italy Istituto di Radioastronomia Bologna, Italy Universita&rs | | Abstract: | We examine the optical properties of the nuclei of low luminosity radio-galaxies using snapshot HST images of the B2 sample. In agreement with the results obtained from the analysis of the brighter 3C/FRI sample, we find a correlation between fluxes (and luminosities) of the optical and radio cores. This provides further support for the interpretation that the optical nuclear emission in FRI is dominated by synchrotron emission and that accretion in these sources takes place in a low efficiency radiative regime. In the framework of the FRI/BL Lacs unified scheme, we find that the luminosity difference between FRI and BL Lac nuclei can be reproduced with a common beaming factor in both the radio and the optical band, independent of the extended radio luminosity, thus supporting such a scenario. The corresponding bulk Lorentz factor is significantly smaller than is expected from observational and theoretical considerations in BL Lacs: this can be interpreted as due to a velocity structure in the jet, with a fast spine surrounded by a slower layer. | | Source: | arXiv, astro-ph/0112151 | | Services: | Forum | Review | PDF | Favorites | |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
|
| |
|
|
|
|
News, job offers and information for researchers and scientists:
| |
REGISTER