Abstract
Hard X-ray observations are crucial to study the non-thermal jet emission
from high-redshift, powerful blazars. We observed two bright z>2 flat spectrum
radio quasars (FSRQs) in hard X-rays to explore the details of their
relativistic jets and their possible variability. S5 0014+81 (at z=3.366) and
B0222+185 (at z=2.690) have been observed twice by the Nuclear Spectroscopic
Telescope Array (NuSTAR) simultaneously with Swift/XRT, showing different
variability behaviours. We found that NuSTAR is instrumental to explore the
variability of powerful high-redshift blazars, even when no gamma-ray emission
is detected. The two sources have proven to have respectively the most luminous
accretion disk and the most powerful jet among known blazars. They are located
at the extreme end of the jet-accretion disk relation previously found for
gamma-ray detected blazars.
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