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20 papers · 1 filter
Not only once: the amazing gamma-ray activity of the blazar PKS 1510-089
F. D'Ammando, C. M. Raiteri, M. Villata +6
PKS 1510-089 is a powerful Flat Spectrum Radio Quasar at z=0.361 with radiative output dominated by the gamma-ray emission. In the last two years PKS 1510-089 showed high variabili…
Testing an unifying view of Gamma Ray Burst afterglows
M. Nardini, G. Ghisellini, G. Ghirlanda +1
Four years after the launch the Swift satellite the nature of the Gamma Ray Bursts (GRBs) broadband afterglow behaviour is still an open issue ad the standard external shock fireba…
Structure of the Accretion Flow in Broad-Line Radio Galaxies: The Case of 3C390.3
R. M. Sambruna, J. N. Reeves, V. Braito +8
We present XMM and Suzaku observations of the Broad-Line Radio Galaxy (BLRG) 3C390.3. The Fe Ka line has a width FWHM ~ 8,800 km/s, consistent within a factor two with the width of…
Type I X-ray Bursts from the Neutron-star Transient XTE J1701-462
Dacheng Lin, Diego Altamirano, Jeroen Homan +3
The neutron-star X-ray transient XTE J1701-462 was observed for 3 Ms with \xte during its 2006-2007 outburst. Here we report on the discovery of three type-I X-ray bursts fro…
The growth and evolution of super massive black holes
S. Murray, R. Gilli, P. Tozzi +19
We discuss the central role played by X-ray studies to reconstruct the past history of formation and evolution of supermassive Black Holes (BHs), and the role they played in shapin…
Evidence for energy injection and a fine-tuned central engine at optical wavelengths in GRB 070419A
A. Melandri, C. Guidorzi, S. Kobayashi +13
We present a comprehensive multiwavelength temporal and spectral analysis of the FRED GRB 070419A. The early-time emission in the -ray and X-ray bands can be explained by a cent…