期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 478, 期 4, 页码 5320-5335出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/sty1324
关键词
galaxies: clusters: general; cosmic background radiation; large-scale structure of Universe
资金
- Isaac Newton Studentship at the University of Cambridge
- Science and Technology Facilities Council
- ERC-StG 'Clusters-XCosmo' [716762]
- DFG Cluster of Excellence 'Origin and Structure of the Universe'
- Transregio programme TR33 'The Dark Universe'
- Leibniz Supercomputer Center (LRZ) [pr86re]
We study the potential of the kinematic Sunyaev-Zel'dovich (kSZ) effect as a probe for cosmology, focusing on the pairwise method. The main challenge is disentangling the cosmologically interesting mean pairwise velocity from the cluster optical depth and the associated uncertainties on the baryonic physics in clusters. Furthermore, the pairwise kSZ signal might be affected by internal cluster motions or correlations between velocity and optical depth. We investigate these effects using the Magneticum cosmological hydrodynamical simulations, one of the largest simulations of this kind performed to date. We produce thermal SZ and kSZ maps with an area of similar or equal to 1600 deg(2), and the corresponding cluster catalogues with M-500c greater than or similar to 3 x 10(13) h(-1) M-circle dot and z less than or similar to 2. From these data sets, we calibrate a scaling relation between the average Compton-y parameter and optical depth. We show that this relation can be used to recover an accurate estimate of the mean pairwise velocity from the kSZ effect, and that this effect can be used as an important probe of cosmology. We discuss the impact of theoretical and observational systematic effects, and find that further work on feedback models is required to interpret future high-precision measurements of the kSZ effect.
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