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- W4311897985 abstract "ABSTRACT The tomographic Alcock–Paczynski (AP) method is a promising method that uses the redshift evolution of anisotropic clustering in redshift space to calibrate cosmology. It extends the applicable range of the AP method to substantially nonlinear scales, yielding very tight cosmological constraints. For future stage-IV slitless spectroscopic surveys, non-negligible redshift errors might reduce the advantage of the tomographic AP method by suppressing the resolution of the nonlinear structure along the line of sight. The present work studies how redshift errors propagate to cosmological parameters in tomographic AP analysis. We use a formula σz = σ(1 + z)α to model the redshift errors, with σ varying from 0.001 to 0.006 and α varying from 0.5 to 1.5. The redshift errors produce a signal of anisotropic clustering that is similar to a strong Finger-of-God effect, which smears out both the AP signal and the contamination caused by redshift-space distortions (RSD). For the target precision of the Chinese Space Station Telescope optical survey (σ ≲ 0.002), the decrement of constraining power on the dark energy equation of state is mild ($lesssim 50{{ rm per cent}}$), and the suppression of RSD contamination leads to a smaller bias-to-signal ratio. Our results indicate that the tomographic AP method will remain a useful and complementary tool for analyses of future slitless spectroscopic surveys." @default.
- W4311897985 created "2023-01-02" @default.
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- W4311897985 date "2022-12-08" @default.
- W4311897985 modified "2023-10-03" @default.
- W4311897985 title "Tomographic Alcock–Paczynski method with redshift errors" @default.
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- W4311897985 doi "https://doi.org/10.1093/mnras/stac2996" @default.
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