| Autor: |
Luo, Xiaolin, Xu, Xiangling, Wang, Xin |
| Předmět: |
|
| Zdroj: |
Monthly Notices of the Royal Astronomical Society; Feb2023, Vol. 518 Issue 4, p6059-6064, 6p |
| Abstrakt: |
In this paper, we report an interesting kinematic phenomenon around the haloes' edge related to the 'splashback' radius. After the shell-crossing, cosmic flow exhibits various rotational morphologies via stream-mixing. Vorticity is generated in a particular way that coincides with the large-scale structure. Notably, one specific flow morphology, which is spiralling inward and compressing in the third direction, concentrates around haloes. A detailed examination that reveals a sharp change in the logarithmic derivative of its volume fraction coincides with the location of the splashback radius R sp defined as the outermost caustic structure. Such a feature encodes valuable phase-space information and provides a new perspective on understanding the dynamical evolution of haloes. As a volume-weighted quantity, the profile of flow morphology is purely kinematic. And unlike other related studies, the rotational flow morphologies capture the anisotropic phase structure in the multistream region. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
|
