The near-IR properties and continuum shapes of high redshift quasars from the sloan digital sky survey

L. Pentericci, H. W. Rix, F. Prada, X. Fan, M. A. Strauss, D. P. Schneider, E. K. Grebel, D. Harbeck, J. Brinkmann, V. K. Narayanan

Research output: Contribution to journalArticle

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Abstract

We present J - H - K′ photometry for a sample of 45 high redshift quasars found by the Sloan Digital Sky Survey. The sample was originally selected on the basis of optical colors and spans a redshift range from 3.6 to 5.03. Our photometry reflects the rest-frame SED longward of Lyα for all redshifts. The results show that the near-IR colors of high redshift quasars are quite uniform. We have modelled the continuum shape of the quasars (from just beyond Lyα to ∼4000 Å) with a power law of the form fv α vα, and find <α> = -0.57 with a scatter of 0.33. This value is similar to what is found for lower redshift quasars over the same restframe wavelength range, and we conclude that there is hardly any evolution in the continuum properties of over the same restframe wavelength range, and we conclude that there is hardly any evolution in the continuum properties of optically selected quasars up to redshift 5. The spectral indices found by combining near-IR with optical photometry are in general consistent but slightly flatter than what is found for the same quasars using the optical spectra and photometry alone, showing that the continuum region used to determine the spectral indices can somewhat influence the results.

Original languageEnglish (US)
Pages (from-to)75-82
Number of pages8
JournalAstronomy and Astrophysics
Volume410
Issue number1
DOIs
StatePublished - Oct 1 2003

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quasars
continuums
wavelength
photometry
power law
color
wavelengths
index
optical spectrum

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Pentericci, L. ; Rix, H. W. ; Prada, F. ; Fan, X. ; Strauss, M. A. ; Schneider, D. P. ; Grebel, E. K. ; Harbeck, D. ; Brinkmann, J. ; Narayanan, V. K. / The near-IR properties and continuum shapes of high redshift quasars from the sloan digital sky survey. In: Astronomy and Astrophysics. 2003 ; Vol. 410, No. 1. pp. 75-82.
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Pentericci, L, Rix, HW, Prada, F, Fan, X, Strauss, MA, Schneider, DP, Grebel, EK, Harbeck, D, Brinkmann, J & Narayanan, VK 2003, 'The near-IR properties and continuum shapes of high redshift quasars from the sloan digital sky survey', Astronomy and Astrophysics, vol. 410, no. 1, pp. 75-82. https://doi.org/10.1051/0004-6361:20031201

The near-IR properties and continuum shapes of high redshift quasars from the sloan digital sky survey. / Pentericci, L.; Rix, H. W.; Prada, F.; Fan, X.; Strauss, M. A.; Schneider, D. P.; Grebel, E. K.; Harbeck, D.; Brinkmann, J.; Narayanan, V. K.

In: Astronomy and Astrophysics, Vol. 410, No. 1, 01.10.2003, p. 75-82.

Research output: Contribution to journalArticle

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T1 - The near-IR properties and continuum shapes of high redshift quasars from the sloan digital sky survey

AU - Pentericci, L.

AU - Rix, H. W.

AU - Prada, F.

AU - Fan, X.

AU - Strauss, M. A.

AU - Schneider, D. P.

AU - Grebel, E. K.

AU - Harbeck, D.

AU - Brinkmann, J.

AU - Narayanan, V. K.

PY - 2003/10/1

Y1 - 2003/10/1

N2 - We present J - H - K′ photometry for a sample of 45 high redshift quasars found by the Sloan Digital Sky Survey. The sample was originally selected on the basis of optical colors and spans a redshift range from 3.6 to 5.03. Our photometry reflects the rest-frame SED longward of Lyα for all redshifts. The results show that the near-IR colors of high redshift quasars are quite uniform. We have modelled the continuum shape of the quasars (from just beyond Lyα to ∼4000 Å) with a power law of the form fv α vα, and find <α> = -0.57 with a scatter of 0.33. This value is similar to what is found for lower redshift quasars over the same restframe wavelength range, and we conclude that there is hardly any evolution in the continuum properties of over the same restframe wavelength range, and we conclude that there is hardly any evolution in the continuum properties of optically selected quasars up to redshift 5. The spectral indices found by combining near-IR with optical photometry are in general consistent but slightly flatter than what is found for the same quasars using the optical spectra and photometry alone, showing that the continuum region used to determine the spectral indices can somewhat influence the results.

AB - We present J - H - K′ photometry for a sample of 45 high redshift quasars found by the Sloan Digital Sky Survey. The sample was originally selected on the basis of optical colors and spans a redshift range from 3.6 to 5.03. Our photometry reflects the rest-frame SED longward of Lyα for all redshifts. The results show that the near-IR colors of high redshift quasars are quite uniform. We have modelled the continuum shape of the quasars (from just beyond Lyα to ∼4000 Å) with a power law of the form fv α vα, and find <α> = -0.57 with a scatter of 0.33. This value is similar to what is found for lower redshift quasars over the same restframe wavelength range, and we conclude that there is hardly any evolution in the continuum properties of over the same restframe wavelength range, and we conclude that there is hardly any evolution in the continuum properties of optically selected quasars up to redshift 5. The spectral indices found by combining near-IR with optical photometry are in general consistent but slightly flatter than what is found for the same quasars using the optical spectra and photometry alone, showing that the continuum region used to determine the spectral indices can somewhat influence the results.

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