Publications (42)
Neutrino-cooled Accretion Model with Magnetic Coupling for X-ray Flares in GRBs
Yang Luo, Wei-Min Gu, Tong Liu +1
The neutrino-cooled accretion disk, which was proposed to work as the central engine of gamma-ray bursts, encounters difficulty in interpreting the X-ray flares after the prompt ga…
Global Dynamics of Advection-Dominated Accretion Revisited
Ju-Fu Lu, Wei-Min Gu, Feng Yuan
We numerically solve the set of dynamical equations describing advection-dominated accretion flows (ADAF) around black holes, using a method similar to that of Chakrabarti (1996a).…
Effects of Stress Evolution Process on the Thermal Stability of Thin Accretion Discs
Da-Bin Lin, Wei-Min Gu, Ju-Fu Lu
The stress evolution process is taken into account in the linear stability analysis of standard thin accretion discs. We find that the growth rate of thermally unstable modes can d…
Broadband Emission Spectra from the Cygnus X-3 Jet in the Soft Spectral State
Jian-Fu Zhang, Ju-Fu Lu
In order to understand the main observational characteristics of the Galactic X-ray binary Cygnus X-3, we propose a radiation model in which high-energy electrons accelerated in th…
Studies of Thermally Unstable Accretion Disks around Black Holes with Adaptive Pseudospectral Domain Decomposition Method. II. Limit-Cycle Behavior in accretion disks around Kerr black holes
Li Xue, Aleksander SÄ dowski, Marek A. Abramowicz +1
For the first time ever, we derive equations governing the time-evolution of fully relativistic slim accretion disks in the Kerr metric, and numerically construct their detailed no…
Non-axisymmetric instabilities in shocked adiabatic accretion flows
Wei-Min Gu, Ju-Fu Lu
We investigate the linear stability of a shocked accretion flow onto a black hole in the adiabatic limit. Our linear analyses and numerical calculations show that, despite the post…
Central Engine of Late-Time X-ray Flares with Internal Origin
Hui-Jun Mu, Wei-Min Gu, Shu-Jin Hou +5
This work focuses on a sample of seven extremely late-time X-ray flares with peak time , among which two flares can be confirmed as the late-time activity…
A Note on the Slim Accretion Disk Model
Wei-Min Gu, Ju-Fu Lu
We show that when the gravitational force is correctly calculated in dealing with the vertical hydrostatic equilibrium of black hole accretion disks, the relationship that is valid…
Potential Gamma-ray Emissions from Low-Mass X-ray Binary Jets
Jian-Fu Zhang, Wei-Min Gu, Tong Liu +2
By proposing a pure leptonic radiation model, we study the potential gamma-ray emissions from jets of the low-mass X-ray binaries. In this model, the relativistic electrons that ar…
The vertical composition of neutrino-dominated accretion disks in gamma-ray bursts
Tong Liu, Li Xue, Wei-Min Gu +1
We investigate the vertical structure and elements distribution of neutrino-dominated accretion flows around black holes in spherical coordinates with the reasonable nuclear statis…
Time evolution of flares in GRB 130925A: jet precession in black hole accretion system
Shu-Jin Hou, Tong Liu, Wei-Min Gu +4
GRB 130925A, composed of three gamma-ray emission episodes and a series of orderly flares, has been detected by , Fermi, Konus-, and . If the third weakest g…
Observational Evidence of Accretion Disk-Caused Jet Precession in Galactic Nuclei
Ju-Fu Lu, Bo-Yan Zhou
We show that the observational data of extragalactic radio sources tend to support the theoretical relationship between the jet precession period and the optical luminosity of the…
Relativistic global solutions of neutrino-dominated accretion flows
Li Xue, Tong Liu, Wei-Min Gu +1
Neutrino-dominated accretion flows (NDAFs) around rotating stellar-mass black holes are plausible candidates for the central engines of gamma-ray bursts (GRBs). We investigate one-…
Revisiting the Thermal Stability of Radiation-dominated Thin Disks
Sheng-Ming Zheng, Feng Yuan, Wei-Min Gu +1
The standard thin disk model predicts that when the accretion rate is over a small fraction of the Eddington rate, which corresponds to $L \ga 0.06 L_{Edd}$, the inner region of th…
High frequency oscillations in outbursts of Kerr-metric slim disks
Li Xue, Wlodek Kluzniak, Aleksander Sadowski +2
We numerically investigate the thermally unstable accretion disks around black holes. We adopt an evolutionary viscous stress equation to replace the standard alpha-prescription ba…
Constraints on the Mass Accretion Rate of Neutrino-Cooled Disks in Gamma-Ray Bursts
Tong Liu, Wei-Min Gu, Li Xue +2
We present a unified description of all the three known classes of optically thick accretion disks around black holes, namely Shakura-Sunyaev disks, slim disks, and neutrino-domina…
Understanding Simulations of Thin Accretion Disks by Energy Equation
Da-Bin Lin, Wei-Min Gu, Tong Liu +2
We study the fluctuations of standard thin accretion disks by linear analysis of the time-dependent energy equation together with the vertical hydrostatic equilibrium and the equat…
Global Slim Accretion Disk Solutions Revisited
Cheng-Liang Jiao, Li Xue, Wei-Min Gu +1
We show that there exists a maximal possible accretion rate, beyond which global slim disk solutions cannot be constructed because in the vertical direction the gravitational force…
Strange stars with different quark mass scalings
Ang Li, Ren-Xin Xu, Ju-Fu Lu
We investigate the stability of strange quark matter and the properties of the corresponding strange stars, within a wide range of quark mass scaling. The calculation shows that th…
Electron transport with re-acceleration and radiation in the jets of X-ray binaries
Jian-Fu Zhang, Zhi-Ren Li, Fu-Yuan Xiang +1
This paper studies acceleration processes of background thermal electrons in X-ray binary jets via turbulent stochastic interactions and shock collisions. By considering turbulent…
Advection-Dominated Accretion Disks: Geometrically Slim or Thick?
Wei-Min Gu, Li Xue, Tong Liu +1
We revisit the vertical structure of black hole accretion disks in spherical coordinates. By comparing the advective cooling with the viscous heating, we show that advection-domina…
Spectral Analyses of the Nearest Persistent Ultraluminous X-Ray Source M33 X-8
Shan-Shan Weng, Jun-Xian Wang, Wei-Min Gu +1
We provide a detailed analysis of 12 XMM observations of the nearest persistent extragalactic ultraluminous X-ray source (ULX), M33 X-8. No significant spectral evolution is detect…
Jet Precession Driven by Neutrino-Cooled Disc for Gamma-Ray Bursts
Tong Liu, En-Wei Liang, Wei-Min Gu +3
A model of jet precession driven by a neutrino-cooled disc around a spinning black hole is present in order to explain the temporal structure and spectral evolution of gamma-ray bu…
Structure and Luminosity of Neutrino-cooled Accretion Disks
Tong Liu, Wei-Min Gu, Li Xue +1
Neutrino-cooled hyperaccretion disks around stellar mass black holes are plausible candidates for the central engine of gamma-ray bursts. We calculate the one-dimensional structure…
Evolutions of stellar-mass black hole hyperaccretion systems in the center of gamma-ray bursts
Cui-Ying Song, Tong Liu, Wei-Min Gu +3
A neutrino-dominated accretion disk around a stellar-mass black hole (BH) can power a gamma-ray burst (GRB) via annihilation of neutrinos launched from the disk. For the BH hyperac…
Revisiting the Light Curves of Gamma-ray Bursts in the Relativistic Turbulence Model
Da-Bin Lin, Wei-Min Gu, Shu-Jin Hou +3
Rapid temporal variability has been widely observed in the light curves of gamma-ray bursts (GRBs). One possible mechanism for such variability is related to the relativistic eddie…
Is There a Relation between Duration and E_iso in Gamma-Ray Bursts?
Shu-Jin Hou, Tong Liu, Da-Bin Lin +2
The system of accretion disk and black hole is usually considered as the central engine of Gamma-ray Bursts (GRBs). It is usually thought that the disk in the central engine of GRB…
Bimodal Accretion Disks: SSD-ADAF Transitions
Wei-Min Gu, Ju-Fu Lu
We show that, unlike the results presented previously in the literature, the transition from an outer Shakura-Sunyaev disk (SSD) to an advection-dominated accretion flow (ADAF) is…
Do Intermediate-Mass Black Holes Exist in Globular Clusters?
Mou-Yuan Sun, Ya-Ling Jin, Wei-Min Gu +3
The existence of intermediate-mass black holes (IMBHs) in globular clusters (GCs) remains a crucial problem. Searching IMBHs in GCs reveals a discrepancy between radio observations…
Revisiting vertical structure of neutrino-dominated accretion disks: Bernoulli parameter, neutrino trapping and other distributions
Tong Liu, Wei-Min Gu, Li Xue +1
We revisit the vertical structure of neutrino dominated accretion flows (NDAFs) in spherical coordinates with a new boundary condition based on the mechanical equilibrium. The solu…
Shakura-Sunyaev Disk Can Smoothly Match Advection-Dominated Accretion Flow
Ju-Fu Lu, Yi-Qing Lin, Wei-Min Gu
We use the standard Runge-Kutta method to solve the set of basic equations describing black hole accretion flows composed of two-temperature plasma. We do not invoke any extra ener…
Global dynamics of radiatively inefficient accretion flows: advection versus convection
Ju-Fu Lu, Shuang-Liang Li, Wei-Min Gu
We obtain global solutions of radiatively inefficiently accretion flows around black holes. Whether and where convection develops in a flow are self-consistently determined with th…
Gravitational Waves of Jet Precession in Gamma-ray Bursts
Mou-Yuan Sun, Tong Liu, Wei-Min Gu +1
The physical nature of gamma-ray bursts (GRBs) are believed to involve an ultra-relativistic jet. The observed complex structure of light curves motivate the idea of jet precession…
Self-gravity in neutrino-dominated accretion disks
Tong Liu, Xiao-Fei Yu, Wei-Min Gu +1
We present the effects of the self-gravity on the vertical structure and neutrino luminosity of the neutrino-dominated accretion disks in cylindrical coordinates. It is found that…
Thermal Stability of Magnetized, Optically Thin, Radiative Cooling-dominated Accretion Disks
Xiao-Fei Yu, Wei-Min Gu, Tong Liu +2
We investigate the thermal stability of optically thin, two-temperature, radiative cooling-dominated accretion disks. Our linear analysis shows that the disk is thermally unstable…
The influence of outflows on the 1/f-like luminosity fluctuations
Da-Bin Lin, Wei-Min Gu, Tong Liu +1
In accretion systems, outflows may have significant influence on the luminosity fluctuations. In this paper, following the Lyubarskii's general scheme, we revisit the power spectra…
Vertical Structure of Neutrino-Dominated Accretion Disk and Applications to Gamma-Ray Bursts
Tong Liu, Wei-Min Gu, Zi-Gao Dai +1
We revisit the vertical structure of neutrino-dominated accretion flows in spherical coordinates. We stress that the flow should be geometrically thick when advection becomes domin…
Studies of Thermally Unstable Accretion Disks around Black Holes with Adaptive Pseudo-Spectral Domain Decomposition Method I. Limit-Cycle Behavior in the Case of Moderate Viscosity
Shuang-Liang Li, Li Xue, Ju-Fu Lu
We present a numerical method for spatially 1.5-dimensional and time-dependent studies of accretion disks around black holes, that is originated from a combination of the standard…
Variability of the giant X-ray bump in GRB 121027A and possible origin
Shu-Jin Hou, He Gao, Tong Liu +7
The particular giant X-ray bump of GRB 121027A triggered by \emph{Swift} is quite different from the typical X-ray flares in gamma-ray bursts. There exhibit four parts of the obser…
Polarization radiation with turbulent magnetic fields from X-ray binaries
Jian-Fu Zhang, Fu-Yuan Xiang, Ju-Fu Lu
We study the properties of polarized radiation in turbulent magnetic fields from X-ray binary jets. These turbulent magnetic fields are composed of large- and small-scale configura…
An analytic relation for the thickness of accretion flows
Zhen-Yi Cai, Wei-Min Gu, Li Xue +1
We take the vertical distribution of the radial and azimuthal velocity into account in spherical coordinates, and find that the analytic relation c_{s0}/(v_K Î) = [(γ-1)/(2γ)]^{…
Neutrino-Dominated Accretion Models for Gamma-Ray Bursts: Effects of General Relativity and Neutrino Opacity
Wei-Min Gu, Tong Liu, Ju-Fu Lu
We first refine the fixed concept in the literature that the usage of the Newtonian potential in studies of black hole accretion is invalid and the general relativistic effect must…