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Constraining the Milky Way Mass Profile with Phase-Space Distribution of Satellite Galaxies
Zhao-Zhou Li, Yong-Zhong Qian, Jiaxin Han +3
We estimate the Milky Way (MW) halo properties using satellite kinematic data including the latest measurements from Gaia DR2. With a simulation-based 6D phase-space distribution f…
A Versatile and Accurate Method for Halo Mass Determination from Phase-Space Distribution of Satellite Galaxies
Zhao-Zhou Li, Yong-Zhong Qian, Jiaxin Han +2
We propose a versatile and accurate method to estimate the halo mass and concentration from the kinematics of satellite galaxies. We construct the 6D phase-space distribution funct…
Determination of Dark Matter Halo Mass from Dynamics of Satellite Galaxies
Zhao-Zhou Li, Y. P. Jing, Yong-Zhong Qian +2
We show that the mass of a dark matter halo can be inferred from the dynamical status of its satellite galaxies. Using 9 dark-matter simulations of halos like the Milky Way (MW), w…
A Chemical Evolution Model for the Fornax Dwarf Spheroidal Galaxy
Zhen Yuan, Yong-Zhong Qian, Y. P. Jing
Fornax is the brightest Milky Way (MW) dwarf spheroidal galaxy and its star formation history (SFH) has been derived from observations. We estimate the time evolution of its gas ma…
Supernova-driven outflows and chemical evolution of dwarf spheroidal galaxies
Yong-Zhong Qian, Gerald J. Wasserburg
We present a general phenomenological model for the metallicity distribution (MD) in terms of [Fe/H] for dwarf spheroidal galaxies (dSphs). These galaxies appear to have stopped ac…
Chemical Evolution of the Juvenile Universe
G. J. Wasserburg, Y. -Z. Qian
Only massive stars contribute to the chemical evolution of the juvenile universe corresponding to [Fe/H]<-1.5. If Type II supernovae (SNe II) are the only relevant sources, then th…