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Gamma-ray polarization constraints on Planck scale violations of special relativity
Luca Maccione, Stefano Liberati, Annalisa Celotti +2
Using recent polarimetric observations of the Crab Nebula in the hard X-ray band by INTEGRAL, we show that the absence of vacuum birefringence effects constrains O(E/M) Lorentz vio…
Long Gamma-Ray Bursts and Their Host Galaxies at High Redshift
A. Lapi, N. Kawakatu, Z. Bosnjak +4
Motivated by the recent observational and theoretical evidence that long Gamma-Ray Bursts (GRBs) are likely associated with low metallicity, rapidly rotating massive stars, we exam…
Science with the new generation high energy gamma- ray experiments
M. Alvarez, D. D'Armiento, G. Agnetta +197
This Conference is the fifth of a series of Workshops on High Energy Gamma- ray Experiments, following the Conferences held in Perugia 2003, Bari 2004, Cividale del Friuli 2005, El…
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…
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…
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…