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The jet of Markarian 501 from the sub-parsec to the kpc scale
G. Giovannini, M. Giroletti, G. B. Taylor
We have observed the BL Lac object Markarian 501 at 1.4 GHz with the High Sensitivity Array and at 86 GHz with the global VLBI mm array. Thanks to the great resolution and sensitiv…
Jet Properties and Evolution in Small and Intermediate Scale Objects
M. Giroletti
Kinematic and spectral studies are improving our knowledge of the age distribution in compact radio sources, providing evidence that small sources are generally very young. The pro…
The two sided parsec scale structure of the Low Luminosity Active Galactic Nucleus in NGC 4278
G. Giovannini, M. Giroletti, G. B. Taylor
We present new Very Long Baseline Interferometry observations of the LINER galaxy NGC 4278 with a linear resolution of < 0.1 pc. Our radio data reveal a two sided structure, with s…
Parsec scale properties of nearby BL Lacs
M. Giroletti, G. Giovannini, G. B. Taylor +1
We present new radio data completing the imaging for a sample of 30 nearby (z < 0.2) BL Lac objects on parsec and kiloparsec scale. The sample is composed of both high and low lumi…
Radio Observations of Nearby HST BL Lacs
M. Giroletti, G. Giovannini, G. B. Taylor +1
We present a radio/optical study of a sample of BL Lac objects at arcsecond and milliarcsecond resolution. The sample consists of 30 nearby (z<0.2) BL Lacs, mostly X-ray selected.…
Parsec Scale Properties of Radio Sources
G. Giovannini, M. Giroletti, G. B. Taylor +3
We present a new complete sample of radio sources selected from the B2 and 3CR catalogues, with no bias respect to the jet velocity and orientation. Using preliminary data we inves…