Papers › Constraints on primordial non-Gaussianity from Quaia
Constraints on primordial non-Gaussianity from Quaia
Giulio Fabbian, David Alonso, Kate Storey-Fisher, Thomas Cornish
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We analyse the large-scale angular clustering of quasars in the \gaia-\unwise quasar catalog, \quaia, and their cross-correlation with maps of the lensing convergence of the Cosmic Microwave Background (CMB), to constrain the level of primordial non-Gaussianity (PNG). Specifically, we target the scale-dependent bias that would be induced by PNG on biased tracers of the matter inhomogeneities on large scales. The \quaia sample is particularly well suited for this analysis, given the large effective volume covered, and our ability to map out the main potential sources of systematic contamination and mitigate their impact. Using the universality relation to characterise the response of the quasar overdensity to PNG (p_ϕ=1), we report constraints on the local-type PNG parameter f_(NL) of f_(NL) =-20.5^(+19.0)_(-18.1) (68\% C.L.) by combining the quasar auto-correlation and its cross-correlation with CMB lensing in two tomographic redshift bins (or f_(NL) =-28.7^(+26.1)_(-24.6) if assuming a lower response for quasars, p_ϕ=1.6). The error on f_(NL) can be further improved if the cross-correlation between the tomographic redshift bins is included. Using the CMB lensing cross-correlations alone, we find f_(NL) =-13.8^(+26.7)_(-25.0) and f_(NL) = -15.6^(+42.3)_(-34.8) for p_ϕ=1 and p_ϕ=1.6 respectively. These are the tightest constraints on f_(NL) to date from angular clustering statistics and cross-correlations with CMB lensing.
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