SIMBAD references

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=3.3x10²⁰cm^–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.