Cross-correlating the EMU Pilot Survey 1 with CMB lensing: Constraints on cosmology and galaxy bias with harmonic-space power spectra

Abstract

We measured the harmonic-space power spectrum of galaxy clustering auto-correlation from the Evolutionary Map of the Universe Pilot Survey 1 data (EMU PS1) and its cross-correlation with the lensing convergence map of cosmic microwave background (CMB) from Planck Public Release 4 at the linear scale range from $\ell =2$ to 500. We applied two flux density cuts at $0.18$ and $0.4$mJy on the radio galaxies observed at 944MHz and considered two source detection algorithms. We found the auto-correlation measurements from the two algorithms at the 0.18mJy cut to deviate for $\ell \gtrsim 250$ due to the different criteria assumed on the source detection and decided to ignore data above this scale. We report a cross-correlation detection of EMU PS1 with CMB lensing at $\sim$5.5$\sigma$, irrespective of flux density cut. In our theoretical modelling we considered two redshift distribution simulation models that yield consistent results, a linear and a non-linear matter power spectrum, and two linear galaxy bias models. That is a constant redshift-independent galaxy bias $b(z)=b_g$ and a constant amplitude galaxy bias $b(z)=b_g/D(z)$. By fixing a cosmology model and considering a non-linear matter power spectrum, we measured a constant galaxy bias at $0.18$mJy ($0.4$mJy) with $b_g=2.32_{-0.33}^{+0.41}$ ($2.18_{-0.25}^{+0.17}$) and a constant amplitude bias with $b_g=1.72_{-0.21}^{+0.31}$ ($1.78_{-0.15}^{+0.22}$). When ${\sigma }_8$ is a free parameter for the same models at $0.18$mJy ($0.4$mJy) with the constant model we found ${\sigma }_8=0.68_{-0.14}^{+0.16}$ ($0.82\pm 0.10$), while with the constant amplitude model we measured ${\sigma }_8=0.61_{-0.20}^{+0.18}$ ($0.78_{-0.09}^{+0.11}$), respectively. Our results agree at $1\sigma$ with the measurements from Planck CMB and the weak lensing surveys and also show the potential of cosmology studies with future radio continuum survey data.

23 pages, 9 figures, 4 tables. Version matching publication at journal

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