Discovery of a pair of z = 4.25 quasars from the Sloan Digital Sky Survey

Donald P. Schneider, Xiaohui Fan, Michael A. Strauss, James E. Gunn, Gordon T. Richards, G. R. Knapp, Robert H. Lupton, David H. Saxe, John E. Anderson, Neta A. Bahcall, J. Brinkmann, Robert Brunner, István Csabai, Masataka Fukugita, G. S. Hennessy, Robert B. Hindsley, Željko Ivezić, R. C. Nichol, Jeffrey R. Pier, Donald G. York

Research output: Contribution to journalReview article

20 Citations (Scopus)

Abstract

We report the discovery of a pair of z = 4.25 quasars with a separation of 33″. The brighter of the two objects was identified as a high-redshift quasar candidate from Sloan Digital Sky Survey multicolor imaging data, and the redshift was measured from a spectrum obtained with the Hobby-Eberly Telescope. The slit orientation of this observation by chance included another quasar, approximately 1 mag fainter and having the same redshift as the target. This is the third serendipitous discovery of a z > 4 quasar. The differences in the relative strengths and profiles of the emission lines suggest that this is a quasar pair and not a gravitational lens. The two objects are likely to be physically associated; the projected physical separation is approximately 210 h-150 kpc and the redshifts are identical to ≈0.01, implying a radial physical separation of 950 h-150 kpc or less. The existence of this pair is strong circumstantial evidence that z ∼ 4 quasars are clustered.

Original languageEnglish (US)
Pages (from-to)2183-2189
Number of pages7
JournalAstronomical Journal
Volume120
Issue number5
DOIs
StatePublished - Jan 1 2000

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quasars
gravitational lenses
slits
telescopes
profiles

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Schneider, D. P., Fan, X., Strauss, M. A., Gunn, J. E., Richards, G. T., Knapp, G. R., ... York, D. G. (2000). Discovery of a pair of z = 4.25 quasars from the Sloan Digital Sky Survey. Astronomical Journal, 120(5), 2183-2189. https://doi.org/10.1086/316834
Schneider, Donald P. ; Fan, Xiaohui ; Strauss, Michael A. ; Gunn, James E. ; Richards, Gordon T. ; Knapp, G. R. ; Lupton, Robert H. ; Saxe, David H. ; Anderson, John E. ; Bahcall, Neta A. ; Brinkmann, J. ; Brunner, Robert ; Csabai, István ; Fukugita, Masataka ; Hennessy, G. S. ; Hindsley, Robert B. ; Ivezić, Željko ; Nichol, R. C. ; Pier, Jeffrey R. ; York, Donald G. / Discovery of a pair of z = 4.25 quasars from the Sloan Digital Sky Survey. In: Astronomical Journal. 2000 ; Vol. 120, No. 5. pp. 2183-2189.
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abstract = "We report the discovery of a pair of z = 4.25 quasars with a separation of 33″. The brighter of the two objects was identified as a high-redshift quasar candidate from Sloan Digital Sky Survey multicolor imaging data, and the redshift was measured from a spectrum obtained with the Hobby-Eberly Telescope. The slit orientation of this observation by chance included another quasar, approximately 1 mag fainter and having the same redshift as the target. This is the third serendipitous discovery of a z > 4 quasar. The differences in the relative strengths and profiles of the emission lines suggest that this is a quasar pair and not a gravitational lens. The two objects are likely to be physically associated; the projected physical separation is approximately 210 h-150 kpc and the redshifts are identical to ≈0.01, implying a radial physical separation of 950 h-150 kpc or less. The existence of this pair is strong circumstantial evidence that z ∼ 4 quasars are clustered.",
author = "Schneider, {Donald P.} and Xiaohui Fan and Strauss, {Michael A.} and Gunn, {James E.} and Richards, {Gordon T.} and Knapp, {G. R.} and Lupton, {Robert H.} and Saxe, {David H.} and Anderson, {John E.} and Bahcall, {Neta A.} and J. Brinkmann and Robert Brunner and Istv{\'a}n Csabai and Masataka Fukugita and Hennessy, {G. S.} and Hindsley, {Robert B.} and Željko Ivezić and Nichol, {R. C.} and Pier, {Jeffrey R.} and York, {Donald G.}",
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Schneider, DP, Fan, X, Strauss, MA, Gunn, JE, Richards, GT, Knapp, GR, Lupton, RH, Saxe, DH, Anderson, JE, Bahcall, NA, Brinkmann, J, Brunner, R, Csabai, I, Fukugita, M, Hennessy, GS, Hindsley, RB, Ivezić, Ž, Nichol, RC, Pier, JR & York, DG 2000, 'Discovery of a pair of z = 4.25 quasars from the Sloan Digital Sky Survey', Astronomical Journal, vol. 120, no. 5, pp. 2183-2189. https://doi.org/10.1086/316834

Discovery of a pair of z = 4.25 quasars from the Sloan Digital Sky Survey. / Schneider, Donald P.; Fan, Xiaohui; Strauss, Michael A.; Gunn, James E.; Richards, Gordon T.; Knapp, G. R.; Lupton, Robert H.; Saxe, David H.; Anderson, John E.; Bahcall, Neta A.; Brinkmann, J.; Brunner, Robert; Csabai, István; Fukugita, Masataka; Hennessy, G. S.; Hindsley, Robert B.; Ivezić, Željko; Nichol, R. C.; Pier, Jeffrey R.; York, Donald G.

In: Astronomical Journal, Vol. 120, No. 5, 01.01.2000, p. 2183-2189.

Research output: Contribution to journalReview article

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T1 - Discovery of a pair of z = 4.25 quasars from the Sloan Digital Sky Survey

AU - Schneider, Donald P.

AU - Fan, Xiaohui

AU - Strauss, Michael A.

AU - Gunn, James E.

AU - Richards, Gordon T.

AU - Knapp, G. R.

AU - Lupton, Robert H.

AU - Saxe, David H.

AU - Anderson, John E.

AU - Bahcall, Neta A.

AU - Brinkmann, J.

AU - Brunner, Robert

AU - Csabai, István

AU - Fukugita, Masataka

AU - Hennessy, G. S.

AU - Hindsley, Robert B.

AU - Ivezić, Željko

AU - Nichol, R. C.

AU - Pier, Jeffrey R.

AU - York, Donald G.

PY - 2000/1/1

Y1 - 2000/1/1

N2 - We report the discovery of a pair of z = 4.25 quasars with a separation of 33″. The brighter of the two objects was identified as a high-redshift quasar candidate from Sloan Digital Sky Survey multicolor imaging data, and the redshift was measured from a spectrum obtained with the Hobby-Eberly Telescope. The slit orientation of this observation by chance included another quasar, approximately 1 mag fainter and having the same redshift as the target. This is the third serendipitous discovery of a z > 4 quasar. The differences in the relative strengths and profiles of the emission lines suggest that this is a quasar pair and not a gravitational lens. The two objects are likely to be physically associated; the projected physical separation is approximately 210 h-150 kpc and the redshifts are identical to ≈0.01, implying a radial physical separation of 950 h-150 kpc or less. The existence of this pair is strong circumstantial evidence that z ∼ 4 quasars are clustered.

AB - We report the discovery of a pair of z = 4.25 quasars with a separation of 33″. The brighter of the two objects was identified as a high-redshift quasar candidate from Sloan Digital Sky Survey multicolor imaging data, and the redshift was measured from a spectrum obtained with the Hobby-Eberly Telescope. The slit orientation of this observation by chance included another quasar, approximately 1 mag fainter and having the same redshift as the target. This is the third serendipitous discovery of a z > 4 quasar. The differences in the relative strengths and profiles of the emission lines suggest that this is a quasar pair and not a gravitational lens. The two objects are likely to be physically associated; the projected physical separation is approximately 210 h-150 kpc and the redshifts are identical to ≈0.01, implying a radial physical separation of 950 h-150 kpc or less. The existence of this pair is strong circumstantial evidence that z ∼ 4 quasars are clustered.

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Schneider DP, Fan X, Strauss MA, Gunn JE, Richards GT, Knapp GR et al. Discovery of a pair of z = 4.25 quasars from the Sloan Digital Sky Survey. Astronomical Journal. 2000 Jan 1;120(5):2183-2189. https://doi.org/10.1086/316834