The kinetic SZ tomography with spectroscopic redshift surveys

Understand

The kinetic Sunyaev Zel'dovich effect (kSZ) effect is a potentially powerful probe to the missing baryons.

• However, the kSZ signal is overwhelmed by various contaminations and the cosmological application is hampered by loss of redshift information due to the projection effect.
• We propose a kSZ tomography method to alleviate these problems, with the aid of galaxy spectroscopic redshift surveys.
• We propose to estimate the large scale peculiar velocity through the 3D galaxy distribution, weigh it by the 3D galaxy density and adopt the product projected along the line of sight with a proper weighting as an estimator of the true kSZ temperature fluctuation $\Theta$.