Homepage of Ken Osato

I am a Specially Appointed Assistant Professor at Center for Frontier Science, Chiba University.
My main research interests are in theoretical and observational astrophysics and cosmology.

Research Highlights

»Research Page

Clustering of emission line galaxies with IllustrisTNG

We have produced mock catalogues of emission line galaxies (ELGs) with IllustrisTNG hydrodynamical simulations. In the first paper of the series, we have addressed the astrophysical properties and halo occupation distributions of simulated ELGs. The mock ELGs catalogues are shared upon request.

Baryon Pasting Algorithm

We have developed algorithms to paste gas onto dark-matter only N-body simulations, which can be run much faster than hydrodynamical simulations. We apply this method to modelling of the Sunyaev-Zel'dovich effect. The all-sky SZ mock maps are available here.

Accelerating perturbation theory with response function approach

The perturbation theory is a central method to accurately predict statistics of large-scale structures. We have developed a fast approach to speed up the calculation with response function expansion, and this method realises 50 times faster calculations than direct integration.

κTNG: Baryonic effects on WL statistics

Baryonic effect is the major systematic effect in weak lensing surveys. We have generated largest suite of mock weak lensing maps, which is composed of 10,000 realisations. The mock maps cover up to the source redshift 2.6. The sample data is available at Columbia Lensing.

HSC WL and Planck tSZ cross-correlation

The cross-correlation of weak lensing and the thermal Sunyaev-Zel'dovich effect probes the large-scale structures and cluster astrophysics. We measured the cross-correlation with HSC and Planck data, and put constraints on cosmological parameters and mass bias parameter.


Center for Frontier Science, Chiba University
1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan
E-mail: ken.osato@chiba-u.jp
Phone: +81-43-290-3248