Cross-correlating Planck CMB lensing with SDSS: Lensing-lensing and galaxy-lensing cross-correlations

Sukhdeep Singh; Rachel Mandelbaum; Joel R. Brownstein

doi:10.1093/mnras/stw2482

paper

Cross-correlating Planck CMB lensing with SDSS: Lensing-lensing and galaxy-lensing cross-correlations

arXiv:1606.08841 · doi:10.1093/mnras/stw2482

Abstract

We present results from cross-correlating Planck CMB lensing maps with the Sloan Digital Sky Survey (SDSS) galaxy lensing shape catalog and BOSS galaxy catalogs. For galaxy position vs. CMB lensing cross-correlations, we measure the convergence signal around the galaxies in configuration space, using the BOSS LOWZ ( $z \sim 0.30$ ) and CMASS ( $z \sim 0.57$ ) samples. With fixed Planck 2015 cosmology, doing a joint fit with the galaxy clustering measurement, for the LOWZ (CMASS) sample we find a galaxy bias $b_{g} = 1.75 \pm 0.04$ ( $1.95 \pm 0.02$ ) and galaxy-matter cross-correlation coefficient $r_{cc} = 1.0 \pm 0.2$ ( $0.8 \pm 0.1$ ) using $20 < r_{p} < 70 h^{- 1}$ Mpc, consistent with results from galaxy-galaxy lensing. Using the same scales and including the galaxy-galaxy lensing measurements, we constrain $Ω_{m} = 0.284 \pm 0.024$ and relative calibration bias between the CMB lensing and galaxy lensing to be $b_{γ} = 0.8 2_{- 0.14}^{+ 0.15}$ . The combination of galaxy lensing and CMB lensing also allows us to measure the cosmological distance ratios (with $z_{l} \sim 0.3$ , $z_{s} \sim 0.5$ ) $R = \frac{D _{s} D _{l, *}}{D _{*} D _{l, s}} = 2.68 \pm 0.29$ , consistent with predictions from the Planck 2015 cosmology ( $R = 2.35$ ). We detect the galaxy position-CMB convergence cross-correlation at small scales, $r_{p} < 1 h^{- 1}$ Mpc, and find consistency with lensing by NFW halos of mass $M_{h} \sim 1 0^{13} h^{- 1} M_{⊙}$ . Finally, we measure the CMB lensing-galaxy shear cross-correlation, finding an amplitude of $A = 0.76 \pm 0.23$ ( $z_{eff} = 0.35$ , $θ < 2^{\circ}$ ) with respect to Planck 2015 $Λ$ CDM predictions ( $1 σ$ -level consistency). We do not find evidence for relative systematics between the CMB and SDSS galaxy lensing.

20 pages. Main results in figure 3 and figures 10-14. Accepted in MNRAS

Cross-correlating Planck CMB lensing with SDSS: Lensing-lensing and galaxy-lensing cross-correlations

Abstract

References in corpus (19)

Cited by in corpus (60)