Baryonic Faber-Jackson Relation in Elliptical and Dwarf Galaxies

Yong Tian^1*, Stacy S. McGaugh², Chung-Ming Ko^1,3, Meng Hua Kuo⁴

¹Institute of Astronomy, National Central University, Taoyuan 32001, Taiwan
²Department of Astronomy, Case Western Reserve University, Cleveland, OH 44106, USA
³Department of Physics and Center for Complex Systems, National Central University, Taoyuan 32001, Taiwan
⁴Institute of Brain Science, National Yang Ming Chiao Tung University, Taipei 112304, Taiwan

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

We investigate a kinematic scaling relation between the baryonic mass and the flat velocity dispersion tail, i.e., the baryonic Faber-Jackson relation (BFJR), in elliptical galaxies. Although the Faber-Jackson relation is well-known, the tightness of the baryonic version is obscure in the literature. On the other hand, a tight radial acceleration relation implies a tight BFJR in pressure-supported systems. By adopting elliptical galaxies in the ATLAS 3D database and dwarf galaxies, we explored the spatially resolved velocity dispersion profiles with the integrated field unit. The maximum likelihood method is performed with the empirical profiles to identify the flat tail. Combining stellar mass and gas mass, we present the preliminary result of the BFJR and examine the tightness of the correlations.

Keywords: dark matter, galaxy kinematics, elliptical galaxies, dwarf galaxies