455 citations · 2.9k across the 55 of their papers we have counts for
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The power of blazar jets
A. Celotti, G. Ghisellini
We estimate the power of relativistic, extragalactic jets by modelling the spectral energy distribution of a large number of blazars. We adopt a simple one-zone, homogeneous, lepto…
On the July 2007 flare of the blazar 3C 454.3
G. Ghisellini, L. Foschini, F. Tavecchio +1
In July 2007, the blazar 3C 454.3 underwent a flare in the optical, reaching R~13 on July 19. Then the optical flux decreased by one magnitude, being R~14 when the source was detec…
Re-born fireballs in Gamma-Ray Bursts
G. Ghisellini, A. Celotti, G. Ghirlanda +2
We consider the interaction between a relativistic fireball and material assumed to be still located just outside the progenitor star. Only a small fraction of the expected mass is…
Swift observations of high-redshift radio-loud quasars
R. M. Sambruna, F. Tavecchio, G. Ghisellini +5
We report on Swift observations of four z>2 radio-loud quasars (0212+735, 0537-286, 0836+710, and 2149-307), classified as blazars. The sources, well-known emitters at soft-medium…
The hard synchrotron X-ray spectrum of the TeV BL Lac 1ES 1426+428
A. Wolter, V. Beckmann, G. Ghisellini +5
We have observed 1ES 1426+428 with INTEGRAL detecting it up to 150 keV. The spectrum is hard, confirming that this source is an extreme BL Lac object, with a synchrotron comp…
Cosmological implications of Gamma Ray Bursts
Gabriele Ghisellini
The discovery that the bolometric energetics (and/or peak luminosity) of Gamma Ray Bursts correlates with their spectral properties has allowed to standardize the burst energetics…