Schwartz, D. A.D. A.SchwartzSiemiginowska, A.A.SiemiginowskaSnios, B.B.SniosWorrall, D. M.D. M.WorrallBirkinshaw, M.M.BirkinshawCheung, C. C.C. C.CheungMarshall, H.H.MarshallMIGLIORI, GIULIAGIULIAMIGLIORIWardle, J. F. C.J. F. C.WardleGobeille, DougDougGobeille2025-02-202025-02-2020200004-637Xhttp://hdl.handle.net/20.500.12386/36112We report the detection of extended X-ray emission from two high-redshift radio quasars. These quasars, J1405+0415 at z = 3.208 and J1610+1811 at z = 3.118, were observed in a Chandra snapshot survey selected from a complete sample of the radio-brightest quasars in the overlap area of the VLA-FIRST radio survey and the Sloan Digital Sky Survey. The extended X-ray emission is located along the line connecting the core to a radio knot or hotspot, favoring the interpretation of X-ray jets. The inferred rest-frame jet X-ray luminosities from 2 to 30 keV would be of order 10<SUP>45</SUP> erg s<SUP>-1</SUP> if emitted isotropically and without relativistic beaming. In the scenario of inverse Compton scattering of the cosmic microwave background (CMB), X-ray jets without a coincident radio counterpart may be common, and should be readily detectable to redshifts even beyond 3.2 due to the (1+z)<SUP>4</SUP> increase of the CMB energy density compensating for the (1+z)<SUP>-4</SUP> cosmological diminution of surface brightness. If these can be X-ray confirmed, they would be the second and third examples of quasar X-ray jets without detection of underlying continuous radio jets.STAMPAenArticle10.3847/1538-4357/abbd99https://iopscience.iop.org/article/10.3847/1538-4357/abbd992020ApJ...904...57SFIS/05 - ASTRONOMIA E ASTROFISICA