A gravitational lens candidate discovered with the Hubble Space Telescope

Dan Maoz, John N. Bahcall, Donald P. Schneider, Rodger Doxsey, Neta A. Bahcall, Alexei V. Filippenko, W. Miller Goss, Ofer Lahav, Brian Yanny

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

We report evidence for gravitational lensing of the high-redshift (z = 3.8) quasar 1208+101, observed as part of the Snapshot Survey with the Hubble Space Telescope Planetary Camera. An HST V image taken on gyroscopes resolves the quasar into three point-source components, with the two fainter images having separations of 0″.1 and 0″.5 from the central bright component. A radio observation of the quasar with the Very Large Array at 2 cm shows that, like most quasars of this redshift, 1208+101 is radio-quiet. Based on positional information alone, the probability that the observed optical components are chance superpositions of Galactic stars is small, but not negligible. Analysis of a combined ground-based spectrum of all three components, using the relative brightnesses from the HST image, supports the lensing hypothesis. If all the components are lensed images of the quasar, the observed configuration cannot be reproduced by simple lens models. Future HST observations can test the lensing hypothesis for 1208+101.

Original languageEnglish (US)
JournalAstrophysical Journal
Volume386
Issue number1 PART 2
StatePublished - Feb 10 1992

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gravitational lenses
Hubble Space Telescope
quasars
radio
Very Large Array (VLA)
radio observation
point source
gyroscopes
point sources
brightness
cameras
lenses
stars
configurations

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Maoz, D., Bahcall, J. N., Schneider, D. P., Doxsey, R., Bahcall, N. A., Filippenko, A. V., ... Yanny, B. (1992). A gravitational lens candidate discovered with the Hubble Space Telescope. Astrophysical Journal, 386(1 PART 2).
Maoz, Dan ; Bahcall, John N. ; Schneider, Donald P. ; Doxsey, Rodger ; Bahcall, Neta A. ; Filippenko, Alexei V. ; Goss, W. Miller ; Lahav, Ofer ; Yanny, Brian. / A gravitational lens candidate discovered with the Hubble Space Telescope. In: Astrophysical Journal. 1992 ; Vol. 386, No. 1 PART 2.
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Maoz, D, Bahcall, JN, Schneider, DP, Doxsey, R, Bahcall, NA, Filippenko, AV, Goss, WM, Lahav, O & Yanny, B 1992, 'A gravitational lens candidate discovered with the Hubble Space Telescope', Astrophysical Journal, vol. 386, no. 1 PART 2.

A gravitational lens candidate discovered with the Hubble Space Telescope. / Maoz, Dan; Bahcall, John N.; Schneider, Donald P.; Doxsey, Rodger; Bahcall, Neta A.; Filippenko, Alexei V.; Goss, W. Miller; Lahav, Ofer; Yanny, Brian.

In: Astrophysical Journal, Vol. 386, No. 1 PART 2, 10.02.1992.

Research output: Contribution to journalArticle

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N2 - We report evidence for gravitational lensing of the high-redshift (z = 3.8) quasar 1208+101, observed as part of the Snapshot Survey with the Hubble Space Telescope Planetary Camera. An HST V image taken on gyroscopes resolves the quasar into three point-source components, with the two fainter images having separations of 0″.1 and 0″.5 from the central bright component. A radio observation of the quasar with the Very Large Array at 2 cm shows that, like most quasars of this redshift, 1208+101 is radio-quiet. Based on positional information alone, the probability that the observed optical components are chance superpositions of Galactic stars is small, but not negligible. Analysis of a combined ground-based spectrum of all three components, using the relative brightnesses from the HST image, supports the lensing hypothesis. If all the components are lensed images of the quasar, the observed configuration cannot be reproduced by simple lens models. Future HST observations can test the lensing hypothesis for 1208+101.

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Maoz D, Bahcall JN, Schneider DP, Doxsey R, Bahcall NA, Filippenko AV et al. A gravitational lens candidate discovered with the Hubble Space Telescope. Astrophysical Journal. 1992 Feb 10;386(1 PART 2).