478 citations · 1.2k across the 27 of their papers we have counts for
7 papers · 1 filter
A momentum conserving -body scheme with individual timesteps
Qirong Zhu
-body simulations study the dynamics of particles under the influence of mutual long-distant forces such as gravity. In practice, -body codes will violate Newton's third…
Primordial Black Holes as Dark Matter: Constraints From Compact Ultra-Faint Dwarfs
Qirong Zhu, Eugene Vasiliev, Yuexing Li +1
The ground-breaking detections of gravitational waves from black hole mergers by LIGO have rekindled interest in primordial black holes (PBHs) and the possibility of dark matter be…
Gas Cooling in Hydrodynamic Simulations with An Exact Time Integration Scheme
Qirong Zhu, Britton Smith, Lars Hernquist
We implement and test the exact time integration method proposed by Townsend 2009 for gas cooling in cosmological hydrodynamic simulations. The errors using this time integrator fo…
Growth of First Galaxies: Impacts of Star Formation and Stellar Feedback
Hidenobu Yajima, Kentaro Nagamine, Qirong Zhu +2
We present the results of cosmological hydrodynamic simulations with zoom-in initial conditions, and investigate the formation of the first galaxies and their evolution towards obs…
The nature of disk of satellites around Milky Way-like galaxies
Moupiya Maji, Qirong Zhu, Federico Marinacci +1
It has been suggested that the satellite galaxies of the Milky Way reside in a highly-flattened, kinematically-coherent plane called Disk of Satellites (DoS). The origin of the DoS…
Is there a disk of satellites around the Milky Way?
Moupiya Maji, Qirong Zhu, Federico Marinacci +1
The "Disk of satellites" (DoS) around Milky Way is a highly debated topic with conflicting interpretations of observations and their theoretical models. We perform a comprehensive…
Baryonic impact on the dark matter orbital properties of Milky Way-sized haloes
Qirong Zhu, Lars Hernquist, Federico Marinacci +2
We study the orbital properties of dark matter haloes by combining a spectral method and cosmological simulations of Milky Way-sized galaxies. We compare the dynamics and orbits of…