DECONSTRUCTING THERMAL SUNYAEV-ZEL'DOVICH-GRAVITATIONAL LENSING CROSS-CORRELATIONS: IMPLICATIONS FOR THE INTRACLUSTER MEDIUM

被引:33
作者
Battaglia, N. [1 ,2 ]
Hill, J. C. [1 ,3 ]
Murray, N. [4 ]
机构
[1] Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA
[2] Carnegie Mellon Univ, McWilliams Ctr Cosmol, Pittsburgh, PA USA
[3] Columbia Univ, Dept Astron, New York, NY 10027 USA
[4] Canadian Inst Theoret Astrophys, Toronto, ON M5S 3H8, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
cosmic background radiation; cosmological parameters; galaxies: clusters: intracluster medium; large-scale structure of universe; methods: analytical; methods: numerical; MICROWAVE BACKGROUND ANISOTROPIES; SUPERMASSIVE BLACK-HOLES; DARK-MATTER HALOS; GALAXY CLUSTERS; POWER SPECTRUM; COSMOLOGICAL SIMULATIONS; STATISTICAL PROPERTIES; PHOTOMETRIC REDSHIFTS; PRESSURE PROFILES; AGN FEEDBACK;
D O I
10.1088/0004-637X/812/2/154
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Recent first detections of the cross-correlation of the thermal Sunyaev-Zel'dovich (tSZ) signal in Planck cosmic microwave background (CMB) temperature maps with gravitational lensing maps inferred from the Planck CMB data and the CFHTLenS galaxy survey provide new probes of the relationship between baryons and dark matter. Using cosmological hydrodynamics simulations, we show that these cross-correlation signals are dominated by contributions from hot gas in the intracluster medium (ICM), rather than diffuse, unbound gas located beyond the virial radius (the "missing baryons"). Thus, these cross-correlations offer a tool with which to study the ICM over a wide range of halo masses and redshifts. In particular, we show that the tSZ-CMB lensing cross-correlation is more sensitive to gas in lower-mass, higher-redshift halos and gas at larger cluster-centric radii than the tSZ-galaxy lensing cross-correlation. Combining these measurements with primary CMB data will constrain feedback models through their signatures in the ICM pressure profile. We forecast the ability of ongoing and future experiments to constrain the parameters of a phenomenological ICM model, including the mean amplitude of the pressure-mass relation, the redshift evolution of this amplitude, and the mean outer logarithmic slope of the pressure profile. The results are promising, with approximate to 5%-20% precision constraints achievable with upcoming experiments, even after marginalizing over cosmological parameters.
引用
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页数:16
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