A survey of z > 5.7 quasars in the sloan digital sky survey. III. Discovery of five additional quasars

Xiaohui Fan, Joseph F. Hennawi, Gordon T. Richards, Michael A. Strauss, Donald P. Schneider, Jennifer L. Donley, Jason E. Young, James Annis, Huan Lin, Hubert Lampeitl, Robert H. Lupton, James E. Gunn, Gillan R. Knapp, W. N. Brandt, Scott Anderson, Neta A. Bahcall, Jon Brinkmann, Robert J. Brunner, Masataka Fukugita, Alexander S. SzalayGyula P. Szokoly, Donald G. York

Research output: Contribution to journalReview article

Abstract

We present the discovery of five new quasars at z > 5.7, selected from the multicolor imaging data of the Sloan Digital Sky Survey (SDSS). Three of them, at redshifts 5.93, 6.07, and 6.22, were selected from ∼1700 deg 2 of new SDSS Main Survey imaging in the northern Galactic cap. An additional quasar, at redshift 5.85, was discovered by co-adding the data obtained in the Fall Equatorial Stripe in the SDSS Southern Survey Region. The fifth object, at redshift 5.80, is selected from a nonstandard SDSS scan in the southern Galactic cap outside the Main Survey area. The spectrum of SDSS J162331.81+311200.5 (z = 6.22) shows a complete Gunn-Peterson trough at z abs > 5.95, similar to the troughs detected in the other three z ≳ 6.2 quasars known. We present a composite spectrum of the z > 5.7 quasars discovered in the SDSS to date. The average emission-line and continuum properties of z ∼ 6 quasars exhibit no significant evolution compared with those at low redshift. Using a complete sample of nine z > 5.7 quasars, we find that the density of quasars with M 1450 < -26.7 at z ∼ 6 is (6 ± 2) × 10 -10 Mpc -3 (H 0 = 65 km s -1 Mpc -1, Ω = 0.35, and Γ = 0.65), consistent with our previous estimates. The luminosity distribution of the sample is fitted with a power-law luminosity function ψ(L) ∝ L -3.2±0.7, somewhat steeper than but consistent with our previous estimates.

Original languageEnglish (US)
Pages (from-to)515-522
Number of pages8
JournalAstronomical Journal
Volume128
Issue number2 1784
DOIs
StatePublished - Aug 1 2004

Fingerprint

quasars
troughs
caps
luminosity
trough
estimates
continuums
power law
composite materials

Keywords

  • Emission lines
  • Quasars
  • Quasars: absorption lines
  • Quasars: general

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Fan, X., Hennawi, J. F., Richards, G. T., Strauss, M. A., Schneider, D. P., Donley, J. L., ... York, D. G. (2004). A survey of z > 5.7 quasars in the sloan digital sky survey. III. Discovery of five additional quasars. Astronomical Journal, 128(2 1784), 515-522. https://doi.org/10.1086/422434

A survey of z > 5.7 quasars in the sloan digital sky survey. III. Discovery of five additional quasars. / Fan, Xiaohui; Hennawi, Joseph F.; Richards, Gordon T.; Strauss, Michael A.; Schneider, Donald P.; Donley, Jennifer L.; Young, Jason E.; Annis, James; Lin, Huan; Lampeitl, Hubert; Lupton, Robert H.; Gunn, James E.; Knapp, Gillan R.; Brandt, W. N.; Anderson, Scott; Bahcall, Neta A.; Brinkmann, Jon; Brunner, Robert J.; Fukugita, Masataka; Szalay, Alexander S.; Szokoly, Gyula P.; York, Donald G.

In: Astronomical Journal, Vol. 128, No. 2 1784, 01.08.2004, p. 515-522.

Research output: Contribution to journalReview article

Fan, X, Hennawi, JF, Richards, GT, Strauss, MA, Schneider, DP, Donley, JL, Young, JE, Annis, J, Lin, H, Lampeitl, H, Lupton, RH, Gunn, JE, Knapp, GR, Brandt, WN, Anderson, S, Bahcall, NA, Brinkmann, J, Brunner, RJ, Fukugita, M, Szalay, AS, Szokoly, GP & York, DG 2004, 'A survey of z > 5.7 quasars in the sloan digital sky survey. III. Discovery of five additional quasars', Astronomical Journal, vol. 128, no. 2 1784, pp. 515-522. https://doi.org/10.1086/422434
Fan X, Hennawi JF, Richards GT, Strauss MA, Schneider DP, Donley JL et al. A survey of z > 5.7 quasars in the sloan digital sky survey. III. Discovery of five additional quasars. Astronomical Journal. 2004 Aug 1;128(2 1784):515-522. https://doi.org/10.1086/422434
Fan, Xiaohui ; Hennawi, Joseph F. ; Richards, Gordon T. ; Strauss, Michael A. ; Schneider, Donald P. ; Donley, Jennifer L. ; Young, Jason E. ; Annis, James ; Lin, Huan ; Lampeitl, Hubert ; Lupton, Robert H. ; Gunn, James E. ; Knapp, Gillan R. ; Brandt, W. N. ; Anderson, Scott ; Bahcall, Neta A. ; Brinkmann, Jon ; Brunner, Robert J. ; Fukugita, Masataka ; Szalay, Alexander S. ; Szokoly, Gyula P. ; York, Donald G. / A survey of z > 5.7 quasars in the sloan digital sky survey. III. Discovery of five additional quasars. In: Astronomical Journal. 2004 ; Vol. 128, No. 2 1784. pp. 515-522.
@article{cb1e256fe0934b89bb2f54fe824d60c5,
title = "A survey of z > 5.7 quasars in the sloan digital sky survey. III. Discovery of five additional quasars",
abstract = "We present the discovery of five new quasars at z > 5.7, selected from the multicolor imaging data of the Sloan Digital Sky Survey (SDSS). Three of them, at redshifts 5.93, 6.07, and 6.22, were selected from ∼1700 deg 2 of new SDSS Main Survey imaging in the northern Galactic cap. An additional quasar, at redshift 5.85, was discovered by co-adding the data obtained in the Fall Equatorial Stripe in the SDSS Southern Survey Region. The fifth object, at redshift 5.80, is selected from a nonstandard SDSS scan in the southern Galactic cap outside the Main Survey area. The spectrum of SDSS J162331.81+311200.5 (z = 6.22) shows a complete Gunn-Peterson trough at z abs > 5.95, similar to the troughs detected in the other three z ≳ 6.2 quasars known. We present a composite spectrum of the z > 5.7 quasars discovered in the SDSS to date. The average emission-line and continuum properties of z ∼ 6 quasars exhibit no significant evolution compared with those at low redshift. Using a complete sample of nine z > 5.7 quasars, we find that the density of quasars with M 1450 < -26.7 at z ∼ 6 is (6 ± 2) × 10 -10 Mpc -3 (H 0 = 65 km s -1 Mpc -1, Ω = 0.35, and Γ = 0.65), consistent with our previous estimates. The luminosity distribution of the sample is fitted with a power-law luminosity function ψ(L) ∝ L -3.2±0.7, somewhat steeper than but consistent with our previous estimates.",
keywords = "Emission lines, Quasars, Quasars: absorption lines, Quasars: general",
author = "Xiaohui Fan and Hennawi, {Joseph F.} and Richards, {Gordon T.} and Strauss, {Michael A.} and Schneider, {Donald P.} and Donley, {Jennifer L.} and Young, {Jason E.} and James Annis and Huan Lin and Hubert Lampeitl and Lupton, {Robert H.} and Gunn, {James E.} and Knapp, {Gillan R.} and Brandt, {W. N.} and Scott Anderson and Bahcall, {Neta A.} and Jon Brinkmann and Brunner, {Robert J.} and Masataka Fukugita and Szalay, {Alexander S.} and Szokoly, {Gyula P.} and York, {Donald G.}",
year = "2004",
month = "8",
day = "1",
doi = "10.1086/422434",
language = "English (US)",
volume = "128",
pages = "515--522",
journal = "Astronomical Journal",
issn = "0004-6256",
publisher = "IOP Publishing Ltd.",
number = "2 1784",

}

TY - JOUR

T1 - A survey of z > 5.7 quasars in the sloan digital sky survey. III. Discovery of five additional quasars

AU - Fan, Xiaohui

AU - Hennawi, Joseph F.

AU - Richards, Gordon T.

AU - Strauss, Michael A.

AU - Schneider, Donald P.

AU - Donley, Jennifer L.

AU - Young, Jason E.

AU - Annis, James

AU - Lin, Huan

AU - Lampeitl, Hubert

AU - Lupton, Robert H.

AU - Gunn, James E.

AU - Knapp, Gillan R.

AU - Brandt, W. N.

AU - Anderson, Scott

AU - Bahcall, Neta A.

AU - Brinkmann, Jon

AU - Brunner, Robert J.

AU - Fukugita, Masataka

AU - Szalay, Alexander S.

AU - Szokoly, Gyula P.

AU - York, Donald G.

PY - 2004/8/1

Y1 - 2004/8/1

N2 - We present the discovery of five new quasars at z > 5.7, selected from the multicolor imaging data of the Sloan Digital Sky Survey (SDSS). Three of them, at redshifts 5.93, 6.07, and 6.22, were selected from ∼1700 deg 2 of new SDSS Main Survey imaging in the northern Galactic cap. An additional quasar, at redshift 5.85, was discovered by co-adding the data obtained in the Fall Equatorial Stripe in the SDSS Southern Survey Region. The fifth object, at redshift 5.80, is selected from a nonstandard SDSS scan in the southern Galactic cap outside the Main Survey area. The spectrum of SDSS J162331.81+311200.5 (z = 6.22) shows a complete Gunn-Peterson trough at z abs > 5.95, similar to the troughs detected in the other three z ≳ 6.2 quasars known. We present a composite spectrum of the z > 5.7 quasars discovered in the SDSS to date. The average emission-line and continuum properties of z ∼ 6 quasars exhibit no significant evolution compared with those at low redshift. Using a complete sample of nine z > 5.7 quasars, we find that the density of quasars with M 1450 < -26.7 at z ∼ 6 is (6 ± 2) × 10 -10 Mpc -3 (H 0 = 65 km s -1 Mpc -1, Ω = 0.35, and Γ = 0.65), consistent with our previous estimates. The luminosity distribution of the sample is fitted with a power-law luminosity function ψ(L) ∝ L -3.2±0.7, somewhat steeper than but consistent with our previous estimates.

AB - We present the discovery of five new quasars at z > 5.7, selected from the multicolor imaging data of the Sloan Digital Sky Survey (SDSS). Three of them, at redshifts 5.93, 6.07, and 6.22, were selected from ∼1700 deg 2 of new SDSS Main Survey imaging in the northern Galactic cap. An additional quasar, at redshift 5.85, was discovered by co-adding the data obtained in the Fall Equatorial Stripe in the SDSS Southern Survey Region. The fifth object, at redshift 5.80, is selected from a nonstandard SDSS scan in the southern Galactic cap outside the Main Survey area. The spectrum of SDSS J162331.81+311200.5 (z = 6.22) shows a complete Gunn-Peterson trough at z abs > 5.95, similar to the troughs detected in the other three z ≳ 6.2 quasars known. We present a composite spectrum of the z > 5.7 quasars discovered in the SDSS to date. The average emission-line and continuum properties of z ∼ 6 quasars exhibit no significant evolution compared with those at low redshift. Using a complete sample of nine z > 5.7 quasars, we find that the density of quasars with M 1450 < -26.7 at z ∼ 6 is (6 ± 2) × 10 -10 Mpc -3 (H 0 = 65 km s -1 Mpc -1, Ω = 0.35, and Γ = 0.65), consistent with our previous estimates. The luminosity distribution of the sample is fitted with a power-law luminosity function ψ(L) ∝ L -3.2±0.7, somewhat steeper than but consistent with our previous estimates.

KW - Emission lines

KW - Quasars

KW - Quasars: absorption lines

KW - Quasars: general

UR - http://www.scopus.com/inward/record.url?scp=4544295232&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=4544295232&partnerID=8YFLogxK

U2 - 10.1086/422434

DO - 10.1086/422434

M3 - Review article

AN - SCOPUS:4544295232

VL - 128

SP - 515

EP - 522

JO - Astronomical Journal

JF - Astronomical Journal

SN - 0004-6256

IS - 2 1784

ER -