http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Baldi, Marco,Lee, Jounghun,Macciò,, Andrea V. IOP Publishing 2011 The Astrophysical journal Vol.732 No.2
<P>We investigate the effects of a coupled dark energy (cDE) scalar field on the alignment between satellites and matter distributions in galaxy clusters. Using high-resolution N-body simulations for Delta CDM and cDE cosmological models, we compute the probability density distribution for the alignment angle between the satellite galaxies and underlying matter distributions, finding a difference between the two scenarios. With respect to Delta CDM, in cDE cosmologies the satellite galaxies are less preferentially located along the major axis of the matter distribution, possibly reducing the tension with observational data. A physical explanation is that the coupling between dark matter and dark energy (DE) acts as an additional tidal force on the satellite galaxies, diminishing the alignments between their distribution and the matter one. Through a Wald test based on the generalized chi(2) statistics, the null hypothesis that the two probability distributions come from the same parent population is rejected at the 99% confidence level. It is concluded that the galaxy-matter alignment in clusters may provide a unique probe of dark sector interactions as well as the nature of DE.</P>