# A NuSTAR view of powerful gamma-ray loud blazars

## TL;DR

This study uses NuSTAR observations to analyze high-redshift gamma-ray loud blazars, revealing their extreme power and extending the understanding of jet and disk luminosity relations at high energies.

## Contribution

It provides new NuSTAR data on z>2 blazars, characterizes their spectral energy distributions, and confirms the jet power-disk luminosity relation at high energies.

## Key findings

- High-redshift blazars are among the most powerful persistent sources.
- Confirmed the relation between jet power and disk luminosity at high energies.
- Extended the jet-disk luminosity relation to the high-energy regime.

## Abstract

We observed with the NuSTAR satellite 3 blazars at z>2, detected in gamma-rays by Fermi/LAT and in the soft X-rays, but not yet observed above 10 keV. The flux and slope of their X-ray continuum, together with Fermi/LAT data allows us to estimate their total electromagnetic output and peak frequency. For some of them we can study the source in different states, and investigate the main cause of the observed different spectral energy distribution. We then collected all blazars at redshift greater than 2 observed by NuSTAR, and confirm that these hard and luminous X-ray blazars are among the most powerful persistent sources in the Universe. We confirm the relation between the jet power and the disk luminosity, extending it at the high energy end.