Uncertainties in the spectral index of the optical spectrum of QSOs induce systematic biases in the estimate of the cosmological evolution of the luminosity function. In a framework of pure luminosity evolution, we obtain a slower intrinsic evolution of the luminosity function for z < 2.2 after correction for uncertainties in the adopted K-correction. The slower evolution is consistent with the apparent density decline of high-redshift QSOs (z > 2.5) observed in the red band. Indeed, we find that a scenario of uniform luminosity evolution up to z congruent-to 4 is suggested. The apparent decline in the redshift distribution is explained in terms of the sliding down along the steep side of the luminosity function for increasing redshift.

Giallongo, E., & Vagnetti, F. (1992). The evolution of the QSO luminosity function up to z = 4: The role of K-correction uncertainties. THE ASTROPHYSICAL JOURNAL, 396(2), 411-415.

The evolution of the QSO luminosity function up to z = 4: The role of K-correction uncertainties

VAGNETTI, FAUSTO
1992

Abstract

Uncertainties in the spectral index of the optical spectrum of QSOs induce systematic biases in the estimate of the cosmological evolution of the luminosity function. In a framework of pure luminosity evolution, we obtain a slower intrinsic evolution of the luminosity function for z < 2.2 after correction for uncertainties in the adopted K-correction. The slower evolution is consistent with the apparent density decline of high-redshift QSOs (z > 2.5) observed in the red band. Indeed, we find that a scenario of uniform luminosity evolution up to z congruent-to 4 is suggested. The apparent decline in the redshift distribution is explained in terms of the sliding down along the steep side of the luminosity function for increasing redshift.
Pubblicato
Rilevanza internazionale
Articolo
Sì, ma tipo non specificato
Settore FIS/05 - Astronomia e Astrofisica
English
Con Impact Factor ISI
COSMOLOGY, THEORY; GALAXIES, LUMINOSITY FUNCTION, MASS FUNCTION; QUASARS, GENERAL
http://adsabs.harvard.edu/full/1992ApJ...396..411G
Giallongo, E., & Vagnetti, F. (1992). The evolution of the QSO luminosity function up to z = 4: The role of K-correction uncertainties. THE ASTROPHYSICAL JOURNAL, 396(2), 411-415.
Giallongo, E; Vagnetti, F
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2108/44725
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