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D. Maoz, E.O. Ofek, A. Shemi, A.J. Barth, A.V. Filippenko, M.S. Brotherton, B.J. Wills, D. Wills, F.J. Lockman
We report the optical identification of an R=18.3 mag, z=2.432 quasar at the position of a 6 cm radio source and a faint ROSAT PSPC X-ray source. The quasar lies within the error circles of unidentified extreme-UV (EUV) detections by the EUVE and ROSAT WFC all-sky surveys at ~400A and ~150A. A 21cm H I emission measurement in the direction of the quasar with a 21'-diameter beam yields a total H I column density of N_H_=3.3x10^20^cm^-2^, two orders of magnitude higher than the maximum allowed for transparency through the Galaxy in the EUV. The source of the EUV flux is therefore probably nearby (<~100pc), and unrelated to the quasar.
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