An X-ray jet discovered by Chandra in the z=4.3 radio-selected quasar GB 1508+5714

Abstract

We report the Chandra discovery of an X-ray jet associated with the redshift 4.3 radio-loud quasar GB 1508+5714. The jet X-ray emission peaks ~2 arcsec to the South-West of the quasar core. We present archival HST WFPC2 data of the quasar field which shows no optical emission at the location of the X-ray jet. We discuss possible emission mechanisms and give constraints to the magnetic field and energy densities for synchrotron radiation or for Compton scattering of the Cosmic Microwave Background radiation as the jet X-ray emission process.

5 pages, 4 figures, submitted to ApJ. Letters on Aug.13, accepted for publication in ApJ Letters on Oct.8

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