10 citations · 22 across the 8 of their papers we have counts for
8 papers
Dependence between some spectral and physical characteristics of quasars
O. Torbaniuk, G. Ivashchenko
Using 192 composite spectra stacked from subsamples of individual SDSS DR7 quasar spectra binned in spectral index, , and logarithm of monochromatic luminosity at 1450 Å, $\lo…
Some spectral properties of the quasar ultraviolet bump
O. Torbaniuk, G. Ivashchenko, O. Sergijenko
In the present work the part of the quasar UV-optical bump within the wavelength range 1210-1450Å was studied with the help of composite spectra compiled from the samples of SDSS D…
Composite spectra of quasars with different UV spectral index
G. Ivashchenko, O. Sergijenko, O. Torbaniuk
The composite spectra of quasars are widely used as templates for redshift determination, as well as for measurements of the mean transmission in Lyα-forest studies, and for invest…
Angular and spatial clustering of photometrically classified quasar candidates from SDSS NBCKDE
G. Ivashchenko, O. Vasylenko, A. V. Tugay
The present paper analyses the quasar clustering using the two-point correlation function (2pCF) and the largest existing sample of photometrically selected quasars: the SDSS NBCKD…
Correlation function of quasars in real and redshift space from the Sloan Digital Sky Survey Data Release 7
G. Ivashchenko, V. I. Zhdanov, A. V. Tugay
We analyze the quasar two-point correlation function (2pCF) within the redshift interval using a sample of 52303 quasars selected from the recent 7th Data Release of th…
Cosmological scalar fields that mimic the cosmological model
V. I. Zhdanov, G. Ivashchenko
We look for cosmologies with a scalar field (dark energy without cosmological constant), which mimic the standard cosmological model yielding exactly the same large-scale ge…