NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Optical Identification of Quasar 0917+7122 in the Direction of an Extreme-Ultraviolet SourceWe 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 approximately 400 A and approximately 150 A, 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(sub H) = 3.3 x 10(exp 20) /sq cm, 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 (approximately < 100 pc), and unrelated to the quasar.
Document ID
20000000422
Acquisition Source
Jet Propulsion Laboratory
Document Type
Reprint (Version printed in journal)
Authors
Maoz, D.
(Tel-Aviv Univ., Ramat-Aviv Tel-Aviv, Israel)
Ofek, E. O.
(Tel-Aviv Univ., Ramat-Aviv Tel-Aviv, Israel)
Shemi, A.
(Tel-Aviv Univ., Ramat-Aviv Tel-Aviv, Israel)
Barth, A. J.
(California Univ. Berkeley, CA United States)
Filippenko, A. V.
(California Univ. Berkeley, CA United States)
Brotherton, M. S.
(McDonald Observatory Austin, TX United States)
Wills, B. J.
(McDonald Observatory Austin, TX United States)
Lockman, F. J.
(National Radio Astronomy Observatory Green Bank, WV United States)
Date Acquired
August 19, 2013
Publication Date
January 1, 1996
Publication Information
Publication: Astronomy and Astrophysics
Publisher: Springer and Verlag
Volume: 308
Subject Category
Space Radiation
Funding Number(s)
CONTRACT_GRANT: HST-GO-2578.01-87A-RQ-Q
CONTRACT_GRANT: NSF AST-89-57063
CONTRACT_GRANT: NAS5-26555
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available