An apparent gravitational lens with an image separation of 2.6 arc min

Edwin L. Turner, Donald P. Schneider, Bernard F. Burke, Jacqueline N. Hewitt, Glen I. Langston, James E. Gunn, Charles R. Lawrence, Maarten Schmidt

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Abstract

We report here observations which confirm Paczynski's speculation 1 that the previously known2 pair of 19th magnitude quasars 1146 + 111B,C are actually two images of a single object produced by a gravitational lens. The image splitting is 157 arc s, more than 20 times greater than any previously reported3, thus indicating an exceptionally massive lensing object. The data supporting the lens hypothesis are remarkably similar, high signal-to-noise, moderate-resolution spectra of the two components. Both spectra show strong Mg II λ2,798 emission at z = 1.012±0.001 with indistinguishable redshifts (Δv = 126±309 km s-1), widths (FWHM = 64±4 Å) and detailed profile shapes. Both spectra also show broad troughs at λ6,180 and several weaker continuum features. Neither object exhibits the [O II] λ3,727 line which is frequently strong in Mg II emission objects. If the foreground galaxy clustering apparent in a deep R band charge-coupled device (CCD) image proves insufficient to explain the large image splitting, other possibilities such as massive dark objects (for example, a ∼1015 Mȯ black hole) or a cosmic string may be indicated.

Original languageEnglish (US)
Pages (from-to)142-144
Number of pages3
JournalNature
Volume321
Issue number6066
DOIs
StatePublished - Dec 1 1986

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gravitational lenses
arcs
troughs
quasars
charge coupled devices
strings
lenses
galaxies
continuums
profiles

All Science Journal Classification (ASJC) codes

  • General

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Turner, E. L., Schneider, D. P., Burke, B. F., Hewitt, J. N., Langston, G. I., Gunn, J. E., ... Schmidt, M. (1986). An apparent gravitational lens with an image separation of 2.6 arc min. Nature, 321(6066), 142-144. https://doi.org/10.1038/321142a0
Turner, Edwin L. ; Schneider, Donald P. ; Burke, Bernard F. ; Hewitt, Jacqueline N. ; Langston, Glen I. ; Gunn, James E. ; Lawrence, Charles R. ; Schmidt, Maarten. / An apparent gravitational lens with an image separation of 2.6 arc min. In: Nature. 1986 ; Vol. 321, No. 6066. pp. 142-144.
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abstract = "We report here observations which confirm Paczynski's speculation 1 that the previously known2 pair of 19th magnitude quasars 1146 + 111B,C are actually two images of a single object produced by a gravitational lens. The image splitting is 157 arc s, more than 20 times greater than any previously reported3, thus indicating an exceptionally massive lensing object. The data supporting the lens hypothesis are remarkably similar, high signal-to-noise, moderate-resolution spectra of the two components. Both spectra show strong Mg II λ2,798 emission at z = 1.012±0.001 with indistinguishable redshifts (Δv = 126±309 km s-1), widths (FWHM = 64±4 {\AA}) and detailed profile shapes. Both spectra also show broad troughs at λ6,180 and several weaker continuum features. Neither object exhibits the [O II] λ3,727 line which is frequently strong in Mg II emission objects. If the foreground galaxy clustering apparent in a deep R band charge-coupled device (CCD) image proves insufficient to explain the large image splitting, other possibilities such as massive dark objects (for example, a ∼1015 Mȯ black hole) or a cosmic string may be indicated.",
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Turner, EL, Schneider, DP, Burke, BF, Hewitt, JN, Langston, GI, Gunn, JE, Lawrence, CR & Schmidt, M 1986, 'An apparent gravitational lens with an image separation of 2.6 arc min', Nature, vol. 321, no. 6066, pp. 142-144. https://doi.org/10.1038/321142a0

An apparent gravitational lens with an image separation of 2.6 arc min. / Turner, Edwin L.; Schneider, Donald P.; Burke, Bernard F.; Hewitt, Jacqueline N.; Langston, Glen I.; Gunn, James E.; Lawrence, Charles R.; Schmidt, Maarten.

In: Nature, Vol. 321, No. 6066, 01.12.1986, p. 142-144.

Research output: Contribution to journalArticle

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AU - Lawrence, Charles R.

AU - Schmidt, Maarten

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N2 - We report here observations which confirm Paczynski's speculation 1 that the previously known2 pair of 19th magnitude quasars 1146 + 111B,C are actually two images of a single object produced by a gravitational lens. The image splitting is 157 arc s, more than 20 times greater than any previously reported3, thus indicating an exceptionally massive lensing object. The data supporting the lens hypothesis are remarkably similar, high signal-to-noise, moderate-resolution spectra of the two components. Both spectra show strong Mg II λ2,798 emission at z = 1.012±0.001 with indistinguishable redshifts (Δv = 126±309 km s-1), widths (FWHM = 64±4 Å) and detailed profile shapes. Both spectra also show broad troughs at λ6,180 and several weaker continuum features. Neither object exhibits the [O II] λ3,727 line which is frequently strong in Mg II emission objects. If the foreground galaxy clustering apparent in a deep R band charge-coupled device (CCD) image proves insufficient to explain the large image splitting, other possibilities such as massive dark objects (for example, a ∼1015 Mȯ black hole) or a cosmic string may be indicated.

AB - We report here observations which confirm Paczynski's speculation 1 that the previously known2 pair of 19th magnitude quasars 1146 + 111B,C are actually two images of a single object produced by a gravitational lens. The image splitting is 157 arc s, more than 20 times greater than any previously reported3, thus indicating an exceptionally massive lensing object. The data supporting the lens hypothesis are remarkably similar, high signal-to-noise, moderate-resolution spectra of the two components. Both spectra show strong Mg II λ2,798 emission at z = 1.012±0.001 with indistinguishable redshifts (Δv = 126±309 km s-1), widths (FWHM = 64±4 Å) and detailed profile shapes. Both spectra also show broad troughs at λ6,180 and several weaker continuum features. Neither object exhibits the [O II] λ3,727 line which is frequently strong in Mg II emission objects. If the foreground galaxy clustering apparent in a deep R band charge-coupled device (CCD) image proves insufficient to explain the large image splitting, other possibilities such as massive dark objects (for example, a ∼1015 Mȯ black hole) or a cosmic string may be indicated.

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Turner EL, Schneider DP, Burke BF, Hewitt JN, Langston GI, Gunn JE et al. An apparent gravitational lens with an image separation of 2.6 arc min. Nature. 1986 Dec 1;321(6066):142-144. https://doi.org/10.1038/321142a0