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Extragalactic jets on subpc and large scales
F. Tavecchio
Jets can be probed in their innermost regions (d~0.1 pc) through the study of the relativistically-boosted emission of blazars. On the other extreme of spatial scales, the study of…
Probing quantum gravity using photons from a flare of the active galactic nucleus Markarian 501 observed by the MAGIC telescope
J. Albert et al., John Ellis, N. E. Mavromatos +3
We analyze the timing of photons observed by the MAGIC telescope during a flare of the active galactic nucleus Mkn 501 for a possible correlation with energy, as suggested by some…
Discovery of Very High Energy gamma-rays from 1ES 1011+496 at z=0.212
MAGIC Collaboration, J. Albert
We report on the discovery of Very High Energy (VHE) gamma-ray emission from the BL Lacertae object 1ES1011+496. The observation was triggered by an optical outburst in March 2007…
The clustering of the luminosities of optical afterglows of long Gamma Ray Bursts
M. Nardini, G. Ghisellini, G. Ghirlanda +3
We studied the optical afterglows of the 24 pre-Swift Gamma-Ray Bursts with known spectroscopic redshift and published estimates of the optical extinction in the source frame. We f…
The XMM-Newton view of the X-ray halo and jet of NGC 6251
R. M. Sambruna, M. Gliozzi, D. Donato +3
We present an XMM observation of the radio jet and diffuse halo of the nearby radio galaxy NGC6251. The EPIC spectrum of the galaxy's halo is best-fitted by a thermal model with te…
Optical and NIR Observations of the Afterglow of GRB 020813
S. Covino, D. Malesani, F. Tavecchio +28
We present optical and near-infrared (NIR) photometry of the bright afterglow of GRB 020813. Our data span from 3 hours to 4 days after the GRB event. A rather sharp achromatic bre…
Probing the physics of relativistic jets through X-ray observations
L. Maraschi, F. Tavecchio
The broad band sensitivity and flexibility of the BeppoSAX satellite have allowed unprecedented studies of the X-ray emission from blazars. Here we focus on recent results on the S…
Extreme synchrotron BL Lac objects
L. Costamante, G. Ghisellini, P. Giommi +8
We performed an observational program with the X-ray satellite BeppoSAX to study objects with extreme synchrotron peak frequencies (nu_peak > 1 keV). Of the seven sources observed,…
Spectral Energy Distributions of Blazars: Facts and Speculations
L. Maraschi, F. Tavecchio
We discuss the present knowledge about the Spectral Energy Distributions (SEDs) of blazars within a unified approach emphasizing overall similarities. The properties of the average…
Multi-Epoch Multiwavelength Spectra and Models for Blazar 3C~279
R. C. Hartman, M. Boettcher
Of the blazars detected by EGRET in GeV gamma rays, 3C 279 is not only the best-observed by EGRET, but also one of the best-monitored at lower frequencies. We have assembled eleven…