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.

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• Euclid preparation: XIX. Impact of magnification on photometric galaxy clustering
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• 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