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19 April 2024 |
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Detection of dark matter Skewness in the VIRMOS-DESCART survey: Implications for Omega_0 | | Ue-Li Pen
; Tongjie Zhang
; Ludovic van Waerbeke
; Yannick Mellier
; Pengjie Zhang
; John Dubinski
; | | Date: |
3 Feb 2003 | | Journal: | Astrophys.J. 592 (2003) 664-673 | | Subject: | astro-ph | | Abstract: | Weak gravitational lensing provides a direct statistical measure of the dark matter distribution. The variance is easiest to measure, which constrains the degenerate product sigma_8Omega^0.6. The degeneracy is broken by measuring the skewness arising from the fact that densities must remain positive, which is not possible when the initially symmetric perturbations become non-linear. Skewness measures the non-linear mass scale, which in combination with the variance measures Omega directly. We present the first detection of dark matter skewness from the Virmos-Decart survey. We have measured the full three point function, and its projections onto windowed skewness. We separate the lensing mode and the B mode. The lensing skewness is detected for a compensated Gaussian on scales of 5.37 arc minutes to be kappa^3=1.06+/-0.06x10^-6. The B-modes are consistent with zero at this scale. The variance for the same window function is kappa^2= 5.32+/-0.62+/-0.98x10^-5, resulting in S_3=375^{+342}_{-124}. Comparing to N-body simulations, we find Omega_0<0.5 at 90% confidence. The Canada-France-Hawaii-Telescope legacy survey and newer simulations should be able to improve significantly on the constraint. | | Source: | arXiv, astro-ph/0302031 | | Services: | Forum | Review | PDF | Favorites | |
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