19 citations · 130 across the 24 of their papers we have counts for
14 papers · 1 filter
Analytical solutions for the evolution of MHD wind-driven accretion discs
Mohsen Shadmehri, Fazeleh Khajenabi
We present new analytical solutions for the evolution of protoplanetary discs (PPDs) where magnetohydrodynamic (MHD) wind-driven processes dominate. Our study uses a 1D model which…
Properties of an accretion disc with a power-law stress-pressure relationship
Mohsen Shadmehri, Fazeleh Khajenabi, Sami Dib +1
Recent numerical simulations of magnetized accretion discs show that the radial-azimuthal component of the stress tensor due to the magnetorotational instability (MRI) is well repr…
Structure of Protoplanetary Discs with Magnetically-driven Winds
Fazeleh Khajenabi, Mohsen Shadmehri, Martin E. Pessah +1
We present a new set of analytical solutions to model the steady state structure of a protoplanetary disc with a magnetically-driven wind. Our model implements a parametrization of…
Structure of radiation dominated gravitoturbulent quasar discs
Mohsen Shadmehri, Fazeleh Khajenabi, Sami Dib
Self-gravitating accretion discs in a gravitoturbulent state, including radiation and gas pressures, are studied using a set of new analytical solutions. While the Toomre parameter…
Effect of the drag force on the orbital motion of the broad-line region clouds
Fazeleh Khajenabi
We investigate orbital motion of cold clouds in the broad line region of active galactic nuclei subject to the gravity of a black hole and a force due to a nonisotropic central sou…
Dynamics of an ensemble of clumps embedded in a magnetized ADAF
Fazeleh Khajenabi, Mina Rahmani
We investigate effects of a global magnetic field on the dynamics of an ensemble of clumps within a magnetized advection-dominated accretion flow by neglecting interactions between…
On the location of the ice line in circumbinary discs
Mohsen Shadmehri, Fazeleh Khajenabi
Position of the ice line in a circumbinary disc is determined using a simplified and illustrative model. Main sources of the heat in the energy balance of the disc, i.e. heating by…
On the dynamics of clouds in the broad-line region of AGNs with an ADAF atmosphere
Fazeleh Khajenabi
We investigate orbital motion of spherical, pressure-confined clouds in the broad-line region (BLR) of active galactic nuclei (AGN). The combined influence of gravity of the centra…
Dynamics of clumps embedded in a hot accretion flow with toroidal magnetic field
Fazeleh Khajenabi, Mina Rahmani, Shahram Abbassi
Dynamics of clumps within a magnetized advection dominated accretion flow is investigated by solving the collisionless Boltzmann equation and considering the drag force due to the…
Role of thermal conduction in an advective accretion with bipolar outflows
Fazeleh Khajenabi, Mohsen Shadmehri
Steady-state advective accretion flows in the presence of thermal conduction are studied. All three components of velocity in a spherical coordinates are considered and the flow di…
Dynamical Friction in a magnetized gas
Mohsen Shadmehri, Fazeleh Khajenabi
When a gravitating point mass moves subsonically through a magnetized and isothermal medium, the dynamical structure of the flow is studied far from the mass using a perturbation a…
Dynamical friction in an isentropic gas
Fazeleh Khajenabi, Sami Dib
When a gravitating object moves across a given mass distribution, it creates an overdense wake behind it. Here, we performed an analytical study of the structure of the flow far fr…
On the gravitational stability of a galactic disc as a two-fluid system
Mohsen Shadmehri, Fazeleh Khajenabi
Gravitational stability of a disc consisting of the gaseous and the stellar components are studied in the linear regime when the gaseous component is turbulent. A phenomenological…
The influence of cosmic-rays on the magnetorotational instability
Fazeleh Khajenabi
We present a linear perturbation analysis of the magnetorotational instability in the presence of the cosmic rays. Dynamical effects of the cosmic rays are considered by a fluid de…