450 citations · 729 across the 8 of their papers we have counts for
8 papers
CMB quenching of high-redshift radio-loud AGNs
G. Ghisellini, F. Haardt, B. Ciardi +4
The very existence of more than a dozen of high-redshift (z>4) blazars indicates that a much larger population of misaligned powerful jetted AGN was already in place when the Unive…
NuSTAR and multifrequency study of the two high-redshift blazars S5 0836+710 and PKS 2149-306
G. Tagliaferri, G. Ghisellini, M. Perri +15
The most powerful blazars are the flat spectrum radio quasars whose emission is dominated by a Compton component peaking between a few hundred keV and a few hundred MeV. We selecte…
SDSS J013127.34-032100.1: a candidate blazar with a 11 billion solar mass black hole at =5.18
G. Ghisellini, G. Tagliaferri, T. Sbarrato +1
The radio-loud quasar SDSS J013127.34-032100.1at a redshift z=5.18 is one of the most distant radio-loud objects. The radio to optical flux ratio (i.e. the radio-loudness) of the s…
An emerging population of BL Lacs with extreme properties: towards a class of EBL and cosmic magnetic field probes?
Giacomo Bonnoli, Fabrizio Tavecchio, Gabriele Ghisellini +1
High energy observations of extreme BL Lac objects, such as 1ES 0229+200 or 1ES 0347-121, recently focused interest both for blazar and jet physics and for the implication on the e…
The power of relativistic jets is larger than the luminosity of their accretion disks
G. Ghisellini, F. Tavecchio, L. Maraschi +2
Theoretical models for the production of relativistic jets from active galactic nuclei predict that jet power arises from the spin and mass of the central black hole, as well as th…
Blazar candidates beyond redshift 4 observed by Swift
T. Sbarrato, G. Ghisellini, G. Tagliaferri +4
We have selected SDSS J222032.50+002537.5 and SDSS J142048.01+120545.9 as best blazar candidates out of a complete sample of extremely radio-loud quasars at z>4, with highly massiv…