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High redshift Fermi blazars
G. Ghisellini, G. Tagliaferri, L. Foschini +6
With the release of the first year Fermi catalogue, the number of blazars detected above 100 MeV lying at high redshift has been largely increased. There are 28 blazars at z>2 in t…
Relativistic jets in Narrow-Line Seyfert 1
L. Foschini, E. Angelakis, G. Bonnoli +20
Narrow-Line Seyfert 1 (NLS1) class of active galactic nuclei (AGNs) is generally radio-quiet, but a small percent of them are radio-loud. The recent discovery by Fermi/LAT of high-…
Probing the very high redshift Universe with Gamma-ray Bursts: prospects for observations with future X-ray instruments
S. Campana, R. Salvaterra, G. Tagliaferri +2
Gamma-Ray Bursts (GRBs) are the most violent explosions in the Universe. Long duration GRBs are associated with the collapse of massive stars, rivaling their host galaxies in lumin…
VLT/X-shooter spectroscopy of the GRB 090926A afterglow
V. D'Elia, J. P. U. Fynbo, S. Covino +21
The aim of this paper is to study the environment and intervening absorbers of the gamma-ray burst GRB 090926A through analysis of optical spectra of its afterglow. We analyze medi…
The New Hard X-ray Mission
G. Tagliaferri, G. Pareschi, A. Argan +12
The Italian New Hard X-ray Mission (NHXM) has been designed to provide a real breakthrough on a number of hot astrophysical issues that includes: black holes census, the physics of…
The Soft X-ray Imager on board EXIST
L. Natalucci, A. Bazzano, F. Panessa +11
The Soft X-ray Imager (SXI) is one of the three instruments on board EXIST, a multi-wavelength observatory in charge of performing a global survey of the sky in hard X-rays searchi…