289 citations · 749 across the 27 of their papers we have counts for
27 papers
Evolution of the stellar mass function in open clusters from a universal and unsegregated initial state
Lu Li, Zhaozhou Li, Zhengyi Shao +2
The stellar mass function (MF) and its spatial variation (mass segregation) within star clusters encode signatures of early formation physics and subsequent secular evolution. Yet,…
The shape-velocity alignment of satellites forged by tidal locking and dynamical friction
Hao Yang, Wenting Wang, Ting S. Li +8
Utilizing the TNG50 simulation, we study two types of alignments for satellites/subhalos: 1) the alignment of their major axes with the galactocentric radial directions (radial ali…
The mass and redshift dependence of halo star clustering
Zhenlin Tan, Wenting Wang, Jiaxin He +5
We adopt the two point correlation function (2PCF) as a statistical tool to quantify the spatial clustering of halo stars, for galaxy systems spanning a wide range in host halo vir…
Scaling Relations in the Phase-Space Structure of Dark Matter Haloes
Axel Gross, Zhaozhou Li, Yong-Zhong Qian
We present new scaling relations for the isotropic phase-space distribution functions (DFs) and energy distributions of simulated dark matter haloes. These relations are inspired b…
Why artificial disruption is not a concern for current cosmological simulations
Feihong He, Jiaxin Han, Zhaozhou Li
Recent studies suggest that cold dark matter subhalos are hard to disrupt and almost all cases of subhalo disruption observed in numerical simulations are due to numerical effects.…
emPDF: Inferring the Milky Way mass with data-driven distribution function in phase space
Zhaozhou Li, Jiaxin Han, Wenting Wang +4
We introduce the emPDF (Empirical Distribution Function), a novel dynamical modeling method that infers the gravitational potential from kinematic tracers with optimal statistical…
How does the velocity anisotropy of halo stars, dark matter and satellite galaxies depend on host halo properties?
Jiaxin He, Wenting Wang, Zhaozhou Li +8
We investigate the mass () and concentration () dependencies of the velocity anisotropy () profiles for different components in the dark matter halo, including…
Inferring the mass content of galaxy clusters with satellite kinematics and Jeans Anisotropic modeling
Rui Shi, Wenting Wang, Zhaozhou Li +7
Satellite galaxies can be used to indicate the dynamical mass of galaxy groups and clusters. In this study, we apply the axis-symmetric Jeans Anisotropic Multi-Gaussian Expansion J…
Phase Space Distribution Functions and Energy Distributions of Dark Matter Particles in Haloes
Axel Gross, Zhaozhou Li, Yong-Zhong Qian
For a spherical dark matter halo with isotropic velocity distribution, the phase space distribution function (DF), the energy distribution, and the density profile form a set of se…
DESI Legacy Imaging Surveys Data Release 9: Cosmological Constraints from Galaxy Clustering and Weak Lensing using the Minimal Bias Model
Haojie Xu, Hekun Li, Jun Zhang +11
We present a tentative constraint on cosmological parameters and from a joint analysis of galaxy clustering and galaxy-galaxy lensing from DESI Legacy Imaging Surveys D…
Unraveling the Complexity of Dwarf Galaxy Dynamics: A study of Binary Orbital Motions
Wenting Wang, Ling Zhu, Yipeng Jing +8
We investigate the impact of binary orbital motions on the dynamical modeling of dwarf galaxies with intrinsic line-of-sight velocity dispersions () of 1 to 9 km/s. Using…
Physical evolution of dark matter halo around the depletion boundary
Hongyu Gao, Jiaxin Han, Matthew Fong +2
We investigate the build-up of the halo profile out to large scale in a cosmological simulation, focusing on the roles played by the recently proposed depletion radii. We explicitl…
Efficient Formation of Massive Galaxies at Cosmic Dawn by Feedback-Free Starbursts
Avishai Dekel, Kartick S. Sarkar, Yuval Birnboim +2
JWST observations indicate a surprising excess of luminous galaxies at and above, consistent with efficient conversion of the accreted gas into stars, unlike the suppres…
Is the core-cusp problem a matter of perspective: Jeans Anisotropic Modeling against numerical simulations
Wenting Wang, Ling Zhu, Zhaozhou Li +14
Mock member stars for 28 dwarf galaxies are constructed from the cosmological Auriga simulation, which reflect the dynamical status of realistic stellar tracers. The axis-symmetric…
The Response of Dark Matter Haloes to Gas Ejection: CuspCore II
Zhaozhou Li, Avishai Dekel, Nir Mandelker +2
We propose an analytic model, CuspCore II, for the response of dark matter (DM) haloes to central gas ejection, as a mechanism for generating DM-deficient cores in dwarfs and high-…
The Universal Specific Merger Rate of Dark Matter Halos
Fuyu Dong, Donghai Zhao, Jiaxin Han +3
We employ a set of high resolution N-body simulations to study the merger rate of dark matter halos. We define a specific merger rate by normalizing the average number of mergers p…
A machine learning approach to infer the accreted stellar mass fractions of central galaxies in the TNG100 simulation
Rui Shi, Wenting Wang, Zhaozhou Li +5
We propose a random forest (RF) machine learning approach to determine the accreted stellar mass fractions () of central galaxies, based on various dark matter halo…
What to expect from dynamical modelling of cluster haloes I. The information content of different dynamical tracers
Qingyang Li, Jiaxin Han, Wenting Wang +3
Using hydrodynamical simulations, we study how well the underlying gravitational potential of a galaxy cluster can be modelled dynamically with different types of tracers. In order…
The outermost edges of the Milky Way halo from galaxy kinematics
Zhao-Zhou Li, Jiaxin Han
We measure for the first time the outermost edges of the Milky Way (MW) halo in terms of the depletion and turnaround radii. The inner depletion radius, , identified…
Robust Gaussian Process Regression Based on Iterative Trimming
Zhao-Zhou Li, Lu Li, Zhengyi Shao
The Gaussian process (GP) regression can be severely biased when the data are contaminated by outliers. This paper presents a new robust GP regression algorithm that iteratively tr…
Modelling unresolved binaries of open clusters in color-magnitude diagram. I. method and application of NGC3532
Lu Li, Zhengyi Shao, Zhao-Zhou Li +3
The binary properties of open clusters place crucial constraints on star formation theory and clusters' dynamical evolution. We develop a comprehensive approach that models the col…
Orbital distribution of infalling satellite halos across cosmic time
Zhao-Zhou Li, Dong-Hai Zhao, Y. P. Jing +2
The initial orbits of infalling subhalos largely determine the subsequent evolution of the subhalos and satellite galaxies therein and shed light on the assembly of their hosts. Us…
The mass of our Milky Way
Wenting Wang, Jiaxin Han, Marius Cautun +2
We perform an extensive review of the numerous studies and methods used to determine the total mass of the Milky Way. We group the various methods into seven broad classes, includi…
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…