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 ∼ 400 Å and ∼ 150 Å, respectively. A 21 cm H I emission measurement in the direction of the quasar with a 21′-diameter beam yields a total H I column density of NH = 3.3 × 1020 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 (≲ 100 pc), and unrelated to the quasar.
|Number of pages||3|
|Journal||Astronomy and Astrophysics|
|State||Published - 10 Apr 1996|
- Quasars: Q 0917+7122
- Ultraviolet: stars
- X-rays: stars