450 citations · 2.1k across the 56 of their papers we have counts for
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Radio-loud AGNs at high redshifts and the cosmic microwave background
G. Ghisellini, A. Celotti, F. Tavecchio +2
We discuss how the interaction between the electrons in a relativistic jet and the Cosmic Microwave Background (CMB) affects the observable properties of radio-loud AGN at early ep…
First Results from NuSTAR Observations of Mkn 421
M. Baloković, M. Ajello, R. D. Blandford +34
Mkn 421 is a nearby active galactic nucleus dominated at all wavelengths by a very broad non-thermal continuum thought to arise from a relativistic jet seen at a small angle to the…
NuSTAR detection of the blazar B2 1023+25 at redshift 5.3
T. Sbarrato, G. Tagliaferri, G. Ghisellini +19
B2 1023+25 is an extremely radio-loud quasar at z=5.3 which was first identified as a likely high-redshift blazar candidate in the SDSS+FIRST quasar catalog. Here we use the Nuclea…
The role of relativistic jets in the heaviest and most active supermassive black holes at high redshift
G. Ghisellini, F. Haardt, R. Della Ceca +2
In powerful radio-quiet active galactic nuclei (AGN), black holes heavier than one billion solar masses form at a redshift ~1.5-2. Supermassive black holes in jetted radio-loud AGN…
Blazar candidates beyond redshift 4 observed with GROND
T. Sbarrato, G. Ghisellini, M. Nardini +4
The search for extremely massive high redshift blazars is essential to put strong constraints on the supermassive black holes formation theories. Up to now, the few blazars known t…