201 citations · 2k across the 65 of their papers we have counts for
65 papers
Numerical testing of mirror diffusion of cosmic rays
Chao Zhang, Siyao Xu
The tension between recent observations and theories on cosmic ray (CR) diffusion necessitates exploration of new CR diffusion mechanisms. We perform the first numerical study on t…
Particle acceleration in self-driven turbulent reconnection
Jian-Fu Zhang, Siyao Xu, Alex Lazarian +1
The theoretical prediction that magnetic reconnection spontaneously drives turbulence has been supported by magnetohydrodynamic (MHD) and kinetic simulations. While reconnection wi…
Mirror acceleration of cosmic rays in a high- medium
Alex Lazarian, Siyao Xu
In a weakly compressible high- medium, pitch-angle scattering and the associated scattering acceleration of cosmic rays (CRs) by anisotropic Alfvén and slow modes of magnetohydr…
Damping of MHD Turbulence in A Partially Ionized Medium
Yue Hu, Siyao Xu, Lev Arzamasskiy +2
The coupling state between ions and neutrals in the interstellar medium plays a key role in the dynamics of magnetohydrodynamic (MHD) turbulence, but is challenging to study numeri…
Cosmic ray propagation in turbulent magnetic fields
Alex Lazarian, Siyao Xu, Yue Hu
Propagation of cosmic rays (CRs) in turbulent and magnetized astrophysical media is a long-standing problem that requires both understanding of the properties of turbulent magnetic…
Wide binary stars formed in the turbulent interstellar medium
Siyao Xu, Hsiang-Chih Hwang, Chris Hamilton +1
The ubiquitous interstellar turbulence regulates star formation and the scaling relations between the initial velocity differences and the initial separations of stars. We propose…
Turbulent reconnection acceleration
Siyao Xu, Alex Lazarian
The ubiquitous turbulence in astrophysical plasmas is important for both magnetic reconnection and reconnection acceleration. We study the particle acceleration during fast 3D turb…
On the injection scale of the turbulence in the partially ionized very local interstellar medium
Siyao Xu, Hui Li
The cascade of magnetohydrodynamic (MHD) turbulence is subject to ion-neutral collisional damping and neutral viscous damping in the partially ionized interstellar medium. By exami…
Faraday Rotation Measure Variations of Repeating Fast Radio Burst Sources
Yuan-Pei Yang, Siyao Xu, Bing Zhang
Recently, some fast radio burst (FRB) repeaters were reported to exhibit complex, diverse variations of Faraday rotation measures (RMs), which implies that they are surrounded by a…
Multi-Phase Magnetic Fields in the Galaxy NGC 3627
Mingrui Liu, Yue Hu, A. Lazarian +2
Magnetic fields play an important role in the formation and evolution of a galaxy, but it is challenging to measure them by observation. Here we study the Seyfert galaxy NGC 3627's…
Turbulent Magnetic Field Amplification by the Interaction of Shock Wave and Inhomogeneous Medium
Yue Hu, Siyao Xu, James M. Stone +1
Magnetic fields on the order of 100 G observed in young supernova remnants cannot be amplified by shock compression alone. To investigate the amplification caused by turbulent d…
Role of magnetic fields in fueling Seyfert nuclei
Yue Hu, Alex Lazarian, Rainer Beck +1
Molecular gas is believed to be the fuel for star formation and nuclear activity in Seyfert galaxies. To explore the role of magnetic fields in funneling molecular gas into the nuc…
Turbulence in Milky Way Star-Forming Regions Traced by Young Stars and Gas
Trung Ha, Yuan Li, Marina Kounkel +3
The interstellar medium (ISM) is turbulent on all scales and in all phases. In this paper, we study turbulence with different tracers in four nearby star-forming regions: Orion, Op…
The Velocity Statistics of Turbulent Clouds in the Presence of Gravity, Magnetic fields, Radiation, and Outflow Feedback
Yue Hu, Christoph Federrath, Siyao Xu +1
The interaction of turbulence, magnetic fields, self-gravity, and stellar feedback within molecular clouds is crucial for understanding star formation. We study the effects of self…
Cosmic ray streaming in the turbulent interstellar medium
Siyao Xu, Alex Lazarian
We study the streaming instability of GeVGeV cosmic rays (CRs) and its damping in the turbulent interstellar medium (ISM). We find that the damping of streaming instability…
Damping of Alfvén waves in MHD turbulence and implications for cosmic ray streaming instability and galactic winds
Alex Lazarian, Siyao Xu
Alfvénic component of MHD turbulence damps Alfvénic waves. The consequences of this effect are important for many processes, from cosmic ray (CR) propagation to launching outflows…
Statistical measurements of dispersion measure fluctuations of FRBs
Siyao Xu, David H. Weinberg, Bing Zhang
Extragalactic Fast Radio Bursts (FRBs) have large dispersion measures (DMs) and are unique probes of intergalactic electron density fluctuations. By using the recently released Fir…
Shock acceleration with oblique and turbulent magnetic fields
Siyao Xu, Alex Lazarian
We investigate shock acceleration in a realistic astrophysical environment with density inhomogeneities. The turbulence induced by the interaction of the shock precursor with upstr…
Superdiffusion of Cosmic Rays in Compressible Magnetized Turbulence
Yue Hu, A. Lazarian, Siyao Xu
Owing to the complexity of turbulent magnetic fields, modeling the diffusion of cosmic rays is challenging. Based on the current understanding of anisotropic magnetohydrodynamic (M…
Diffusion of cosmic rays in MHD turbulence
Siyao Xu
We review some recent findings on diffusion of cosmic rays (CRs) in magnetohydrodynamic (MHD) turbulence obtained by adopting the numerically-tested model of MHD turbulence, includ…
Mirror diffusion of cosmic rays in highly compressible turbulence near supernova remnants
Siyao Xu
Recent gamma-ray observations reveal inhomogeneous diffusion of cosmic rays (CRs) in the interstellar medium (ISM). This is expected as the diffusion of CRs depends on the properti…
Small-scale turbulent dynamo in astrophysical environments: nonlinear dynamo and dynamo in a partially ionized plasma
Siyao Xu, Alex Lazarian
Small-scale turbulent dynamo is responsible for the amplification of magnetic fields on scales smaller than the driving scale of turbulence in diverse astrophysical media. Most ear…
Diffusion of cosmic rays in MHD turbulence with magnetic mirrors
Alex Lazarian, Siyao Xu
As the fundamental physical process with many astrophysical implications, the diffusion of cosmic rays (CRs) is determined by their interaction with magnetohydrodynamic (MHD) turbu…
Anisotropic Turbulence in Position-Position-Velocity Space: Probing Three-Dimensional Magnetic Fields
Yue Hu, A. Lazarian, Siyao Xu
Direct measurements of three-dimensional magnetic fields in the interstellar medium (ISM) are not achievable. However, the anisotropic nature of magnetohydrodynamic (MHD) turbulenc…