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A general formula for the correlation function in redshift space is derivedin linear theory. The formula simultaneously includes wide-angle effects andcosmological distortions. The formula is applicable to any pair with arbitraryangle $\theta$ between lines of sight, and arbitrary redshifts, $z_1$, $z_2$,which are not necessarily small. The effects of the spatial curvature both ongeometry and on fluctuation spectrum are properly taken into account, and thusour formula holds in a Friedman-Lema\^{\i}tre universe with arbitrarycosmological parameters $\Omega_0$ and $\lambda_0$. We illustrate the patternof the resulting correlation function with several models, and also show thatvalidity region of the conventional distant observer approximation is $\theta\le 10^\circ$.Comment: 45 pages including 9 figures, To Appear in Astrophys. J. 535 (2000

The Correlation Function in Redshift Space: General Formula with Wide‐Angle Effects and Cosmological Distortions