Specific features of the average magnitude of quasars as a function of redshift

Details Specific features of the average magnitude of quasars as a function of redshift Specific features of the average magnitude of quasars as a function of redshift

2011-09-15

arxiv.org/abs/1109.3630v1

Physics

General Physics

7 pages, 3 figures

Scientific paper

In this article we examine the dependency of the magnitude of quasars as a function of their redshift for the quasars from the SDSS-DR5 quasar catalog in different frequency ranges in the system (u,g,r,i,z). We show that on the smoothed curves mag(Z) in frequency ranges u,g,r there are characteristic features both similar for all the curves and different for different curves. At Z<2 all the curves have practically the same form with two characteristic sections of the negative slope, at Z>2 the forms of the curves significantly differ. The nature of these differences can be interpreted as an influence of light absorption by the neutral hydrogen on Lyman-alpha line, manifesting on the curves in the ranges u,g and missing on the curve in the range r. We show that the form of the dependency in the range r, free from the Lyman-alpha absorption effect, corresponds to the increasing of the quasars luminosity averaged by the celestial sphere with the increasing of their redshift, which correlates to the observation data about the high luminosity of the quasars with big redshifts. We propose the empiric formula for extrapolation of the dependency rmag(Z) to the area of big redshifts. We built the dependency of the average luminosity from the magnitude of redshift and performed the evaluation for the recently discovered quasar with Z=7.085.

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