Multi-wavelength spectroscopic probes: biases from neglecting light-cone effects

Abstract

Next-generation cosmological surveys will observe larger cosmic volumes than ever before, enabling us to access information on the primordial Universe, as well as on relativistic effects. In a companion paper, we applied a Fisher analysis to forecast the expected precision on $f_{\mathrm{NL}}$ and the detectability of the lensing magnification and Doppler contributions to the power spectrum. Here we assess the bias on the best-fit values of $f_{\mathrm{NL}}$ and other parameters, from neglecting these light-cone effects. We consider forthcoming 21cm intensity mapping surveys (SKAO) and optical galaxy surveys (DESI and Euclid), both individually and combined together. We conclude that lensing magnification at higher redshifts must be included in the modelling of spectroscopic surveys. If lensing is neglected in the analysis, this produces a bias of more than 1$\sigma$ - not only on $f_{\mathrm{NL}}$, but also on the standard cosmological parameters.

arXiv commentVersion accepted by JCAP

References in corpus (26)

• The DESI Experiment Part I: Science,Targeting, and Survey Design
• Large-scale clustering of galaxies in general relativity
• On model selection forecasting, Dark Energy and modified gravity
• Blind foreground subtraction for intensity mapping experiments
• Ultra large-scale cosmology in next-generation experiments with single tracers
• Constraining ultra large-scale cosmology with multiple tracers in optical and radio surveys
• Disentangling non-Gaussianity, bias and GR effects in the galaxy distribution
• Beyond the plane-parallel and Newtonian approach: Wide-angle redshift distortions and convergence in general relativity
• Einstein's legacy in galaxy surveys
• Cosmological Measurements with General Relativistic Galaxy Correlations
• Measuring the lensing potential with tomographic galaxy number counts
• Euclid preparation: VII. Forecast validation for Euclid cosmological probes
• The impact of relativistic effects on cosmological parameter estimation
• Magnification and evolution biases in large-scale structure surveys
• On the importance of lensing for galaxy clustering in photometric and spectroscopic surveys
• Primordial non-Gaussianity from the Completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey I: Catalogue Preparation and Systematic Mitigation
• Lensing convergence and the neutrino mass scale in galaxy redshift surveys
• Beware of commonly used approximations II: estimating systematic biases in the best-fit parameters
• Magnification effect on the detection of primordial non-Gaussianity from photometric surveys
• Optimised angular power spectra for spectroscopic galaxy surveys
• The degeneracy between primordial non-Gaussianity and foregrounds in 21cm intensity mapping experiments
• The observed galaxy bispectrum from single-field inflation in the squeezed limit
• Developing a unified pipeline for large-scale structure data analysis with angular power spectra -- II. A case study for magnification bias and radio continuum surveys
• Ultra-large-scale approximations and galaxy clustering: debiasing constraints on cosmological parameters
• Measuring ultra-large scale effects in the presence of 21cm intensity mapping foregrounds
• Neglecting Primordial non-Gaussianity Threatens Future Cosmological Experiment Accuracy

Cited by in corpus (16)

• Euclid preparation: XIX. Impact of magnification on photometric galaxy clustering
• Magnification and evolution biases in large-scale structure surveys
• Constraining spatial curvature with large-scale structure
• Wide-angle and relativistic effects in Fourier-space clustering statistics
• Clustering of Gravitational Wave and Supernovae events: a multitracer analysis in Luminosity Distance Space
• Constraining primordial non-Gaussianity by combining next-generation galaxy and 21 cm intensity mapping surveys
• On cosmological bias due to the magnification of shear and position samples in modern weak lensing analyses
• Radio-optical synergies at high redshift to constrain primordial non-Gaussianity
• Anti-symmetric clustering signals in the observed power spectrum
• Primordial non-Gaussianity -- the effects of relativistic and wide-angle corrections to the power spectrum
• Using relativistic effects in large-scale structure to constrain astrophysical properties of galaxy populations
• Constraining primordial non-Gaussianity by combining photometric galaxy and 21cm intensity mapping surveys
• Multi-tracing the primordial Universe with future surveys
• Detecting Relativistic Doppler by Multi-Tracing a Single Galaxy Population
• Multi-wavelength spectroscopic probes: prospects for primordial non-Gaussianity and relativistic effects
• Detecting Local and Integrated Relativistic Effects by Multi-Tracing a Single Galaxy Population in Harmonic Space