Optical identification of quasar 0917+7122 in the direction of an extreme-ultraviolet source

D. Maoz; E. O. Ofek; A. Shemi; A. J. Barth; A. V. Filippenko; M. S. Brotherton; B. J. Wills; D. Wills; F. J. Lockman

Optical identification of quasar 0917+7122 in the direction of an extreme-ultraviolet source

D. Maoz^*, E. O. Ofek, A. Shemi, A. J. Barth, A. V. Filippenko, M. S. Brotherton, B. J. Wills, D. Wills, F. J. Lockman

^*Corresponding author for this work

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

Abstract

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 N_H = 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.

Original language	English
Pages (from-to)	511-513
Number of pages	3
Journal	Astronomy and Astrophysics
Volume	308
Issue number	2
State	Published - 10 Apr 1996

Keywords

Quasars: Q 0917+7122
Ultraviolet: stars
X-rays: stars

Cite this

@article{fa63d91a26ce4cc297d0e3aabe67c61c,

title = "Optical identification of quasar 0917+7122 in the direction of an extreme-ultraviolet source",

abstract = "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 {\AA} and ∼ 150 {\AA}, 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.",

keywords = "Quasars: Q 0917+7122, Ultraviolet: stars, X-rays: stars",

author = "D. Maoz and Ofek, {E. O.} and A. Shemi and Barth, {A. J.} and Filippenko, {A. V.} and Brotherton, {M. S.} and Wills, {B. J.} and D. Wills and Lockman, {F. J.}",

year = "1996",

month = apr,

day = "10",

language = "אנגלית",

volume = "308",

pages = "511--513",

journal = "Astronomy and Astrophysics",

issn = "0004-6361",

publisher = "EDP Sciences",

number = "2",

}

TY - JOUR

T1 - Optical identification of quasar 0917+7122 in the direction of an extreme-ultraviolet source

AU - Maoz, D.

AU - Ofek, E. O.

AU - Shemi, A.

AU - Barth, A. J.

AU - Filippenko, A. V.

AU - Brotherton, M. S.

AU - Wills, B. J.

AU - Wills, D.

AU - Lockman, F. J.

PY - 1996/4/10

Y1 - 1996/4/10

N2 - 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.

AB - 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.

KW - Quasars: Q 0917+7122

KW - Ultraviolet: stars

KW - X-rays: stars

UR - http://www.scopus.com/inward/record.url?scp=0042756817&partnerID=8YFLogxK

M3 - ???researchoutput.researchoutputtypes.contributiontojournal.article???

AN - SCOPUS:0042756817

SN - 0004-6361

VL - 308

SP - 511

EP - 513

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

IS - 2

ER -

Optical identification of quasar 0917+7122 in the direction of an extreme-ultraviolet source

Abstract

Keywords

Other files and links

Fingerprint

Cite this