High-redshift quasars found in sloan digital sky survey commissioning data. III. A color-selected sample at i* < 20 in the fall equatorial stripe

Xiaohui Fan, Michael A. Strauss, Gordon T. Richards, Jeffrey A. Newman, Robert H. Becker, Donald P. Schneider, James E. Gunn, Marc Davis, Richard L. White, Robert H. Lupton, John E. Anderson, James Annis, Neta A. Bahcall, Robert J. Brunner, István Csabai, Mamoru Doi, Masataka Fukugita, G. S. Hennessy, Robert B. Hindsley, Željko Ivezić & 6 others Gillian R. Knapp, Timothy A. McKay, Jeffrey A. Munn, Jeffrey R. Pier, Alexander S. Szalay, Donald G. York

Research output: Contribution to journalArticle

82 Citations (Scopus)

Abstract

This is the third paper in a series aimed at finding high-redshift quasars from five-color (u′g′r′i′z′) imaging data taken along the celestial equator by the Sloan Digital Sky Survey (SDSS) during its commissioning phase. In this paper, we first present the observations of 14 bright, high-redshift quasars (3.66 ≤ z ≤ 4.77, i* ≲ 20) discovered in the SDSS fall equatorial stripe, and the SDSS photometry of two previously known high-redshift quasars in the same region of the sky. Combined with the quasars presented in Paper I and by Schneider et al., we define a color-selected flux-limited sample of 39 quasars at 3.6 < z < 5.0 and i* ≲ 20, covering a total effective area of 182 deg2. From this sample, we estimate the average spectral power-law slope in the rest-frame UV for quasars at z ∼ 4 to be -0.79 with a standard deviation of 0.34, and the average rest-frame equivalent width of the Lyα + N v emission line to be 69 Å with a standard deviation of 18 Å. The selection completeness of this multicolor sample is determined from the model colors of high-redshift quasars, taking into account the distributions of emission-line strengths, intrinsic continuum slope, the line and continuum absorption from intervening material, and the effects of photometric errors. The average completeness of this sample is about 75%. The selection function calculated in this paper will be used to correct the incompleteness of this color-selected sample and to derive the high-redshift quasar luminosity function in a companion paper. In an appendix, we present the observations of an additional 18 faint quasars (3.57 ≤ z ≤ 4.80, 20.1 ≤ i* ≤ 20.8) discovered in the region on the sky that has been imaged twice. Several quasars presented in this paper exhibit interesting properties, including a radio-loud quasar at z = 4.77 and a narrow-line quasar (FWHM = 1500 km s-1) at z = 3.57.

Original languageEnglish (US)
Pages (from-to)31-53
Number of pages23
JournalAstronomical Journal
Volume121
Issue number1
StatePublished - 2001
Externally publishedYes

Fingerprint

quasars
color
power law
completeness
radio
sky
standard deviation
slopes
continuums
equators
photometry
coverings
luminosity

Keywords

  • Quasars: General
  • Surveys

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Fan, X., Strauss, M. A., Richards, G. T., Newman, J. A., Becker, R. H., Schneider, D. P., ... York, D. G. (2001). High-redshift quasars found in sloan digital sky survey commissioning data. III. A color-selected sample at i* < 20 in the fall equatorial stripe. Astronomical Journal, 121(1), 31-53.

High-redshift quasars found in sloan digital sky survey commissioning data. III. A color-selected sample at i* < 20 in the fall equatorial stripe. / Fan, Xiaohui; Strauss, Michael A.; Richards, Gordon T.; Newman, Jeffrey A.; Becker, Robert H.; Schneider, Donald P.; Gunn, James E.; Davis, Marc; White, Richard L.; Lupton, Robert H.; Anderson, John E.; Annis, James; Bahcall, Neta A.; Brunner, Robert J.; Csabai, István; Doi, Mamoru; Fukugita, Masataka; Hennessy, G. S.; Hindsley, Robert B.; Ivezić, Željko; Knapp, Gillian R.; McKay, Timothy A.; Munn, Jeffrey A.; Pier, Jeffrey R.; Szalay, Alexander S.; York, Donald G.

In: Astronomical Journal, Vol. 121, No. 1, 2001, p. 31-53.

Research output: Contribution to journalArticle

Fan, X, Strauss, MA, Richards, GT, Newman, JA, Becker, RH, Schneider, DP, Gunn, JE, Davis, M, White, RL, Lupton, RH, Anderson, JE, Annis, J, Bahcall, NA, Brunner, RJ, Csabai, I, Doi, M, Fukugita, M, Hennessy, GS, Hindsley, RB, Ivezić, Ž, Knapp, GR, McKay, TA, Munn, JA, Pier, JR, Szalay, AS & York, DG 2001, 'High-redshift quasars found in sloan digital sky survey commissioning data. III. A color-selected sample at i* < 20 in the fall equatorial stripe', Astronomical Journal, vol. 121, no. 1, pp. 31-53.
Fan, Xiaohui ; Strauss, Michael A. ; Richards, Gordon T. ; Newman, Jeffrey A. ; Becker, Robert H. ; Schneider, Donald P. ; Gunn, James E. ; Davis, Marc ; White, Richard L. ; Lupton, Robert H. ; Anderson, John E. ; Annis, James ; Bahcall, Neta A. ; Brunner, Robert J. ; Csabai, István ; Doi, Mamoru ; Fukugita, Masataka ; Hennessy, G. S. ; Hindsley, Robert B. ; Ivezić, Željko ; Knapp, Gillian R. ; McKay, Timothy A. ; Munn, Jeffrey A. ; Pier, Jeffrey R. ; Szalay, Alexander S. ; York, Donald G. / High-redshift quasars found in sloan digital sky survey commissioning data. III. A color-selected sample at i* < 20 in the fall equatorial stripe. In: Astronomical Journal. 2001 ; Vol. 121, No. 1. pp. 31-53.
@article{e59b2f6616e64b589b07ea3a4e304811,
title = "High-redshift quasars found in sloan digital sky survey commissioning data. III. A color-selected sample at i* < 20 in the fall equatorial stripe",
abstract = "This is the third paper in a series aimed at finding high-redshift quasars from five-color (u′g′r′i′z′) imaging data taken along the celestial equator by the Sloan Digital Sky Survey (SDSS) during its commissioning phase. In this paper, we first present the observations of 14 bright, high-redshift quasars (3.66 ≤ z ≤ 4.77, i* ≲ 20) discovered in the SDSS fall equatorial stripe, and the SDSS photometry of two previously known high-redshift quasars in the same region of the sky. Combined with the quasars presented in Paper I and by Schneider et al., we define a color-selected flux-limited sample of 39 quasars at 3.6 < z < 5.0 and i* ≲ 20, covering a total effective area of 182 deg2. From this sample, we estimate the average spectral power-law slope in the rest-frame UV for quasars at z ∼ 4 to be -0.79 with a standard deviation of 0.34, and the average rest-frame equivalent width of the Lyα + N v emission line to be 69 {\AA} with a standard deviation of 18 {\AA}. The selection completeness of this multicolor sample is determined from the model colors of high-redshift quasars, taking into account the distributions of emission-line strengths, intrinsic continuum slope, the line and continuum absorption from intervening material, and the effects of photometric errors. The average completeness of this sample is about 75{\%}. The selection function calculated in this paper will be used to correct the incompleteness of this color-selected sample and to derive the high-redshift quasar luminosity function in a companion paper. In an appendix, we present the observations of an additional 18 faint quasars (3.57 ≤ z ≤ 4.80, 20.1 ≤ i* ≤ 20.8) discovered in the region on the sky that has been imaged twice. Several quasars presented in this paper exhibit interesting properties, including a radio-loud quasar at z = 4.77 and a narrow-line quasar (FWHM = 1500 km s-1) at z = 3.57.",
keywords = "Quasars: General, Surveys",
author = "Xiaohui Fan and Strauss, {Michael A.} and Richards, {Gordon T.} and Newman, {Jeffrey A.} and Becker, {Robert H.} and Schneider, {Donald P.} and Gunn, {James E.} and Marc Davis and White, {Richard L.} and Lupton, {Robert H.} and Anderson, {John E.} and James Annis and Bahcall, {Neta A.} and Brunner, {Robert J.} and Istv{\'a}n Csabai and Mamoru Doi and Masataka Fukugita and Hennessy, {G. S.} and Hindsley, {Robert B.} and Željko Ivezić and Knapp, {Gillian R.} and McKay, {Timothy A.} and Munn, {Jeffrey A.} and Pier, {Jeffrey R.} and Szalay, {Alexander S.} and York, {Donald G.}",
year = "2001",
language = "English (US)",
volume = "121",
pages = "31--53",
journal = "Astronomical Journal",
issn = "0004-6256",
publisher = "IOP Publishing Ltd.",
number = "1",

}

TY - JOUR

T1 - High-redshift quasars found in sloan digital sky survey commissioning data. III. A color-selected sample at i* < 20 in the fall equatorial stripe

AU - Fan, Xiaohui

AU - Strauss, Michael A.

AU - Richards, Gordon T.

AU - Newman, Jeffrey A.

AU - Becker, Robert H.

AU - Schneider, Donald P.

AU - Gunn, James E.

AU - Davis, Marc

AU - White, Richard L.

AU - Lupton, Robert H.

AU - Anderson, John E.

AU - Annis, James

AU - Bahcall, Neta A.

AU - Brunner, Robert J.

AU - Csabai, István

AU - Doi, Mamoru

AU - Fukugita, Masataka

AU - Hennessy, G. S.

AU - Hindsley, Robert B.

AU - Ivezić, Željko

AU - Knapp, Gillian R.

AU - McKay, Timothy A.

AU - Munn, Jeffrey A.

AU - Pier, Jeffrey R.

AU - Szalay, Alexander S.

AU - York, Donald G.

PY - 2001

Y1 - 2001

N2 - This is the third paper in a series aimed at finding high-redshift quasars from five-color (u′g′r′i′z′) imaging data taken along the celestial equator by the Sloan Digital Sky Survey (SDSS) during its commissioning phase. In this paper, we first present the observations of 14 bright, high-redshift quasars (3.66 ≤ z ≤ 4.77, i* ≲ 20) discovered in the SDSS fall equatorial stripe, and the SDSS photometry of two previously known high-redshift quasars in the same region of the sky. Combined with the quasars presented in Paper I and by Schneider et al., we define a color-selected flux-limited sample of 39 quasars at 3.6 < z < 5.0 and i* ≲ 20, covering a total effective area of 182 deg2. From this sample, we estimate the average spectral power-law slope in the rest-frame UV for quasars at z ∼ 4 to be -0.79 with a standard deviation of 0.34, and the average rest-frame equivalent width of the Lyα + N v emission line to be 69 Å with a standard deviation of 18 Å. The selection completeness of this multicolor sample is determined from the model colors of high-redshift quasars, taking into account the distributions of emission-line strengths, intrinsic continuum slope, the line and continuum absorption from intervening material, and the effects of photometric errors. The average completeness of this sample is about 75%. The selection function calculated in this paper will be used to correct the incompleteness of this color-selected sample and to derive the high-redshift quasar luminosity function in a companion paper. In an appendix, we present the observations of an additional 18 faint quasars (3.57 ≤ z ≤ 4.80, 20.1 ≤ i* ≤ 20.8) discovered in the region on the sky that has been imaged twice. Several quasars presented in this paper exhibit interesting properties, including a radio-loud quasar at z = 4.77 and a narrow-line quasar (FWHM = 1500 km s-1) at z = 3.57.

AB - This is the third paper in a series aimed at finding high-redshift quasars from five-color (u′g′r′i′z′) imaging data taken along the celestial equator by the Sloan Digital Sky Survey (SDSS) during its commissioning phase. In this paper, we first present the observations of 14 bright, high-redshift quasars (3.66 ≤ z ≤ 4.77, i* ≲ 20) discovered in the SDSS fall equatorial stripe, and the SDSS photometry of two previously known high-redshift quasars in the same region of the sky. Combined with the quasars presented in Paper I and by Schneider et al., we define a color-selected flux-limited sample of 39 quasars at 3.6 < z < 5.0 and i* ≲ 20, covering a total effective area of 182 deg2. From this sample, we estimate the average spectral power-law slope in the rest-frame UV for quasars at z ∼ 4 to be -0.79 with a standard deviation of 0.34, and the average rest-frame equivalent width of the Lyα + N v emission line to be 69 Å with a standard deviation of 18 Å. The selection completeness of this multicolor sample is determined from the model colors of high-redshift quasars, taking into account the distributions of emission-line strengths, intrinsic continuum slope, the line and continuum absorption from intervening material, and the effects of photometric errors. The average completeness of this sample is about 75%. The selection function calculated in this paper will be used to correct the incompleteness of this color-selected sample and to derive the high-redshift quasar luminosity function in a companion paper. In an appendix, we present the observations of an additional 18 faint quasars (3.57 ≤ z ≤ 4.80, 20.1 ≤ i* ≤ 20.8) discovered in the region on the sky that has been imaged twice. Several quasars presented in this paper exhibit interesting properties, including a radio-loud quasar at z = 4.77 and a narrow-line quasar (FWHM = 1500 km s-1) at z = 3.57.

KW - Quasars: General

KW - Surveys

UR - http://www.scopus.com/inward/record.url?scp=17544404885&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=17544404885&partnerID=8YFLogxK

M3 - Article

VL - 121

SP - 31

EP - 53

JO - Astronomical Journal

JF - Astronomical Journal

SN - 0004-6256

IS - 1

ER -