Abundance Matching Relation Implied by Radial Acceleration Relation in Spiral Galaxies

Yong Tian^1*, Chung-Ming Ko^1,2

¹Institute of Astronomy, National Central University, Taoyuan, Taiwan
²Department of Physics and Center of Complex Systems, National Central University, Taoyuan, Taiwan

* Presenter:Yong Tian, email:yongtian@astro.ncu.edu.tw

The spiral galaxies in the SPARC database revealed the radial acceleration relation (RAR) between the observed and baryonic acceleration. The RAR posed some challenges to the dark matter paradigm, including the tightness of the relation, the origin of the low acceleration relation and the acceleration constant. To answer these questions, the dark matter model, either the semi-analytical model or hydro-dynamical simulation, needs an abundance matching relation (AMR) which relates the halo mass and the baryonic mass. We argue that the observed RAR implies an AMR directly. This leaves little room for dark matter model to tune its AMR to obtain a consistent RAR.

Keywords: 天文物理