<i>NuSTAR</i>DETECTION OF THE BLAZAR B2 1023+25 AT REDSHIFT 5.3
<i>NuSTAR</i>DETECTION OF THE BLAZAR B2 1023+25 AT REDSHIFT 5.3
B2 1023+25 is an extremely radio-loud quasar at z = 5.3 that was first identified as a likely high-redshift blazar candidate in the SDSS+FIRST quasar catalog. Here, we use the Nuclear Spectroscopic Telescope Array (NuSTAR) to investigate its non-thermal jet emission, whose high-energy component we detected in the hard X-ray …