First Evidence of Intrinsic Alignments of Red Galaxies at $z > 1$: Cross-correlation between CFHTLenS and FastSound Samples

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We report the first evidence for intrinsic alignment (IA) of red galaxies at $z>1$.

• We measure the gravitational shear-intrinsic ellipticity (GI) cross-correlation function at $z\sim1.3$ using galaxy positions from the FastSound spectroscopic survey and galaxy shapes from Canada-Hawaii-France telescope lensing survey data.
• Adopting the non-linear alignment model, we obtain a $2.4\sigma$-level detection of the IA amplitude $A^{\rm LA}=27.48_{-11.54}^{+11.53}$ (and $2.6\sigma$ with $A^{\rm LA}=29.43_{-11.49}^{+11.48}$ when weak-lensing contaminations are taken into account), which is larger than the value extrapolated from the constraints obtained at lower redshifts.
• Our measured IA is translated into a $\sim 20\%$ contamination to the weak lensing power spectrum for the red galaxies.