Correlation function of quasars and redshift-space distortions from SDSS DR5 data
Ivashchenko, GY, 1Zhdanov, VI 1Astronomical Observatory of Taras Shevchenko National University of Kyiv, Kyiv, Ukraine |
Kinemat. fiz. nebesnyh tel (Online) 2010, 26(1):43-56 |
Language: Russian |
Abstract: We determined the parameters of two-point correlation function of quasars with z from 0.8 to 2.2 and redshift-space distortion parameter β associated with large-scale infall. A sample of quasars from SDSS DR5 was used as initial data. All the estimates were obtained within the power-low correlation function model ξ(r) = (r0 / r)γ for comoving separations between quasars in pairs in the range from 2 to 50 Mpc; cosmological parameters are considered to be known: ΩΛ = 1 - ΩM = 0.726, H0= 70.5 km/(s⋅Mpc). The obtained parameters have the following values: γ = 1.77 ± 0.20, r0 = 5.52 + 0.95 Mpc/h within the distance interval 2—30 Mpc and γ = 1.91 ± 0.11, r0 = 5.82 ± 0.61 Mpc/h within the distance interval 2—50 Mpc. The mean value of the distortion parameter is β = 0.43 ± 0.22. |
Keywords: quasar, redshift, SDSS |