A survey of z ∼ 6 quasars in the sloan digital sky survey deep stripe. II. Discovery of six quasars at z AB>21

Linhua Jiang, Xiaohui Fan, Fuyan Bian, James Annis, Kuenley Chiu, Sebastian Jester, Huan Lin, Roberth Lupton, Gordon T. Richards, Michael A. Strauss, Viktor Malanushenko, Elena Malanushenko, Donald P. Schneider

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Abstract

We present the discovery of six new quasars at z ∼ 6 selected from the Sloan Digital Sky Survey (SDSS) southern survey, a deep imaging survey obtained by repeatedly scanning a stripe along the celestial equator. The six quasars are about 2 mag fainter than the luminous z 6 quasars found in the SDSS main survey and 1 mag fainter than the quasars reported in Paper I. Four of them comprise a complete flux-limited sample at 21 < z AB < 21.8 over an effective area of 195 deg 2. The other two quasars are fainter than z AB = 22 and are not part of the complete sample. The quasar luminosity function at z 6 is well described as a single power law Φ(L 1450) L β 1450 over the luminosity range -28 < M 1450 < -25. The best-fitting slope β varies from -2.6 to -3.1, depending on the quasar samples used, with a statistical error of 0.3-0.4. About 40% of the quasars discovered in the SDSS southern survey have very narrow Lyα emission lines, which may indicate small black hole masses and high Eddington luminosity ratios, and therefore short black hole growth timescales for these faint quasars at early epochs.

Original languageEnglish (US)
Pages (from-to)305-311
Number of pages7
JournalAstronomical Journal
Volume138
Issue number1
DOIs
StatePublished - Aug 3 2009

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quasars
luminosity
power law
equators
timescale
time measurement
slopes
scanning

All Science Journal Classification (ASJC) codes

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Jiang, Linhua ; Fan, Xiaohui ; Bian, Fuyan ; Annis, James ; Chiu, Kuenley ; Jester, Sebastian ; Lin, Huan ; Lupton, Roberth ; Richards, Gordon T. ; Strauss, Michael A. ; Malanushenko, Viktor ; Malanushenko, Elena ; Schneider, Donald P. / A survey of z ∼ 6 quasars in the sloan digital sky survey deep stripe. II. Discovery of six quasars at z AB>21. In: Astronomical Journal. 2009 ; Vol. 138, No. 1. pp. 305-311.
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title = "A survey of z ∼ 6 quasars in the sloan digital sky survey deep stripe. II. Discovery of six quasars at z AB>21",
abstract = "We present the discovery of six new quasars at z ∼ 6 selected from the Sloan Digital Sky Survey (SDSS) southern survey, a deep imaging survey obtained by repeatedly scanning a stripe along the celestial equator. The six quasars are about 2 mag fainter than the luminous z 6 quasars found in the SDSS main survey and 1 mag fainter than the quasars reported in Paper I. Four of them comprise a complete flux-limited sample at 21 < z AB < 21.8 over an effective area of 195 deg 2. The other two quasars are fainter than z AB = 22 and are not part of the complete sample. The quasar luminosity function at z 6 is well described as a single power law Φ(L 1450) L β 1450 over the luminosity range -28 < M 1450 < -25. The best-fitting slope β varies from -2.6 to -3.1, depending on the quasar samples used, with a statistical error of 0.3-0.4. About 40{\%} of the quasars discovered in the SDSS southern survey have very narrow Lyα emission lines, which may indicate small black hole masses and high Eddington luminosity ratios, and therefore short black hole growth timescales for these faint quasars at early epochs.",
author = "Linhua Jiang and Xiaohui Fan and Fuyan Bian and James Annis and Kuenley Chiu and Sebastian Jester and Huan Lin and Roberth Lupton and Richards, {Gordon T.} and Strauss, {Michael A.} and Viktor Malanushenko and Elena Malanushenko and Schneider, {Donald P.}",
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Jiang, L, Fan, X, Bian, F, Annis, J, Chiu, K, Jester, S, Lin, H, Lupton, R, Richards, GT, Strauss, MA, Malanushenko, V, Malanushenko, E & Schneider, DP 2009, 'A survey of z ∼ 6 quasars in the sloan digital sky survey deep stripe. II. Discovery of six quasars at z AB>21', Astronomical Journal, vol. 138, no. 1, pp. 305-311. https://doi.org/10.1088/0004-6256/138/1/305

A survey of z ∼ 6 quasars in the sloan digital sky survey deep stripe. II. Discovery of six quasars at z AB>21. / Jiang, Linhua; Fan, Xiaohui; Bian, Fuyan; Annis, James; Chiu, Kuenley; Jester, Sebastian; Lin, Huan; Lupton, Roberth; Richards, Gordon T.; Strauss, Michael A.; Malanushenko, Viktor; Malanushenko, Elena; Schneider, Donald P.

In: Astronomical Journal, Vol. 138, No. 1, 03.08.2009, p. 305-311.

Research output: Contribution to journalArticle

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T1 - A survey of z ∼ 6 quasars in the sloan digital sky survey deep stripe. II. Discovery of six quasars at z AB>21

AU - Jiang, Linhua

AU - Fan, Xiaohui

AU - Bian, Fuyan

AU - Annis, James

AU - Chiu, Kuenley

AU - Jester, Sebastian

AU - Lin, Huan

AU - Lupton, Roberth

AU - Richards, Gordon T.

AU - Strauss, Michael A.

AU - Malanushenko, Viktor

AU - Malanushenko, Elena

AU - Schneider, Donald P.

PY - 2009/8/3

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N2 - We present the discovery of six new quasars at z ∼ 6 selected from the Sloan Digital Sky Survey (SDSS) southern survey, a deep imaging survey obtained by repeatedly scanning a stripe along the celestial equator. The six quasars are about 2 mag fainter than the luminous z 6 quasars found in the SDSS main survey and 1 mag fainter than the quasars reported in Paper I. Four of them comprise a complete flux-limited sample at 21 < z AB < 21.8 over an effective area of 195 deg 2. The other two quasars are fainter than z AB = 22 and are not part of the complete sample. The quasar luminosity function at z 6 is well described as a single power law Φ(L 1450) L β 1450 over the luminosity range -28 < M 1450 < -25. The best-fitting slope β varies from -2.6 to -3.1, depending on the quasar samples used, with a statistical error of 0.3-0.4. About 40% of the quasars discovered in the SDSS southern survey have very narrow Lyα emission lines, which may indicate small black hole masses and high Eddington luminosity ratios, and therefore short black hole growth timescales for these faint quasars at early epochs.

AB - We present the discovery of six new quasars at z ∼ 6 selected from the Sloan Digital Sky Survey (SDSS) southern survey, a deep imaging survey obtained by repeatedly scanning a stripe along the celestial equator. The six quasars are about 2 mag fainter than the luminous z 6 quasars found in the SDSS main survey and 1 mag fainter than the quasars reported in Paper I. Four of them comprise a complete flux-limited sample at 21 < z AB < 21.8 over an effective area of 195 deg 2. The other two quasars are fainter than z AB = 22 and are not part of the complete sample. The quasar luminosity function at z 6 is well described as a single power law Φ(L 1450) L β 1450 over the luminosity range -28 < M 1450 < -25. The best-fitting slope β varies from -2.6 to -3.1, depending on the quasar samples used, with a statistical error of 0.3-0.4. About 40% of the quasars discovered in the SDSS southern survey have very narrow Lyα emission lines, which may indicate small black hole masses and high Eddington luminosity ratios, and therefore short black hole growth timescales for these faint quasars at early epochs.

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