Radio Identification of the X-ray Jet in the z=4.3 Quasar GB 1508+5714

Abstract

The recent discovery of an X-ray jet in the z=4.3 quasar GB 1508+5714 by Yuan et al. (astro-ph/0309318) and Siemiginowska et al. (astro-ph/0310241) prompted a search for its radio counterpart. Here, we report the successful discovery of faint radio emission from the jet at 1.4 GHz using archival VLA data. The X-ray emission is best interpreted as inverse Compton (IC) emission off the CMB as discussed by the previous investigators. In this scenario, its high X-ray to radio monochromatic luminosity ratio, compared to previously detected IC/CMB X-ray jets at lower redshift, is a natural consequence of its high redshift.

arXiv comment7 pages, with 4 figures. ApJL accepted. Figure 4 replaced: several entries which did not affect analysis, were calculated incorrectly

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• X-ray Emission Properties of Large Scale Jets, Hotspots and Lobes in Active Galactic Nuclei
• Q0906+6930: The Highest-Redshift Blazar
• Witnessing the gradual slow-down of powerful extragalactic jets: The X-ray -- optical -- radio connection
• Chandra and HST observations of gamma-ray blazars: comparing jet emission at small and large scales
• Large Scale Extragalactic Jets in the Chandra era I: data reduction and analysis
• An X-ray Imaging Survey of Quasar Jets -- Testing the Inverse Compton Model
• An X-ray and Multiwavelength Survey of Highly Radio-Loud Quasars at z > 4: Jet-Linked Emission in the Brightest Radio Beacons of the Early Universe
• Chandra Observations of Radio-Loud Quasars at z > 4: X-rays from the Radio Beacons of the Early Universe
• Blazars at the Cosmic Dawn
• The Spectral Energy Distribution of the High-Z Blazar Q0906+693
• XMM-Newton Observations of High Redshift Quasars
• Serendipitous discovery of an extended X-ray jet without a radio counterpart in a high-redshift quasar
• Detecting Relativistic X-ray Jets in High-Redshift Quasars
• Discovery of a Kiloparsec Scale X-ray/Radio Jet in the z=4.72 Quasar GB 1428+4217
• Confronting X-ray Emission Models with the Highest-Redshift Kiloparsec-scale Jets: the z=3.89 Jet in Quasar 1745+624
• Bulk Comptonization of the Cosmic Microwave Background by Extragalactic Jets as a Probe of their Matter Content
• Two Candidate High-Redshift X-ray Jets Without Coincident Radio Jets
• Multi-frequency polarization properties of ten quasars on deca-parsec scales at z > 3
• A Multi-Wavelength Study of Multiple Spectral Component Jets in AGN: Testing the IC/CMB Model for the Large-Scale-Jet X-ray Emission
• Discovery of Candidate X-ray Jets in High-Redshift Quasars
• The Impact of the CMB on the Evolution of high-z Blazars
• X-ray emission around the z=4.1 radio galaxy TNJ1338-1942 and the potential role of far-infrared photons in AGN Feedback
• Chandra X-ray observations of the hyper-luminous infrared galaxy IRAS F15307+3252
• Subarcsecond view on the high-redshift blazar GB 1508+5714 by the International LOFAR Telescope
• Very-long-baseline interferometry study of the flaring blazar TXS 1508+572 in the early Universe
• Multifrequency Radiation of Extragalactic Large-Scale Jets