Optical Identification of Quasar 0917+7122 in the Direction of an Extreme-Ultraviolet Source

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dc.creatorMaoz, Dan
dc.creatorOfek, Eran
dc.creatorShemi, Amotz
dc.creatorBarth, Aaron
dc.creatorFilippenko, Alexei
dc.creatorBrotherton, Michael
dc.creatorWills, Beverley
dc.creatorWills, Derek
dc.creatorLockman, Felix J.
dc.date1995-09-21
dc.date.accessioned2026-07-07T02:20:13Z
dc.date.available2026-07-07T02:20:13Z
dc.descriptionWe 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 $\sim 400$ Å and $\sim 150$ 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 $N_{H}=3.3\times 10^{20}$ 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 ($\ltorder 100$ pc), and unrelated to the quasar.
dc.description9 pages, compressed, uuencoded postscript, including figures. Accepted by A&A (Research Note)
dc.identifierhttps://arxiv.org/abs/astro-ph/9509120
dc.identifierhttp://arxiv.org/abs/astro-ph/9509120
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/10141
dc.subjectAstrophysics
dc.titleOptical Identification of Quasar 0917+7122 in the Direction of an Extreme-Ultraviolet Source
dc.typetext

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