Optical Identification of Quasar 0917+7122 in the Direction of an Extreme-Ultraviolet Source
Maoz, Dan · Ofek, Eran · Shemi, Amotz · Barth, Aaron · Filippenko, Alexei · Brotherton, Michael · Wills, Beverley · Wills, Derek · Lockman, Felix J.
Original · EN
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 PSPC X-ray source. The quasar lies within the error circles of unidentified extreme-UV (EUV) detections by the and 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.
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