668 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Institute for Research in Fundamental SciencesIR108 papers
- Damghan UniversityIR31 papers
- Islamic Azad University, MashhadIR13 papers
- K. N. Toosi University of TechnologyIR13 papers
- Farhangian UniversityIR12 papers
- Shahid Beheshti UniversityIR11 papers
- University of TehranIR11 papers
- Dublin City UniversityIE10 papers
- Golestan UniversityIR10 papers
- Centre National de la Recherche ScientifiqueFR9 papers
- Deakin UniversityAU9 papers
- Institute of Metal Superplasticity ProblemsRU9 papers
34 papers · 1 filter
Jeans criterion in hydrostatic stratified media
Mahmood Roshan, Asiyeh Habibi
The classical Jeans stability criterion neglects spatial gradients in background physical quantities such as density and pressure. Here, we revisit the Jeans analysis for a non-rot…
A bar stability criterion distinguishing between modified gravity and dark matter in galaxies
Tahere Kashfi, Mahmood Roshan, Virginia Cuomo +3
This paper presents a study on the distinguishability of dark matter and Modified Newtonian Dynamics (MOND) at galactic scales based on the stability criterion proposed by Efstathi…
The Tremaine-Weinberg method at high redshifts
Mahmood Roshan, Asiyeh Habibi, J. Alfonso L. Aguerri +11
This paper examines the reliability of the Tremaine-Weinberg (TW) method in measuring the pattern speed of barred galaxies at high redshifts. Measuring pattern speeds at high redsh…
The redshift evolution of galactic bar pattern speed in TNG50
Asiyeh Habibi, Mahmood Roshan, Mohammad Hosseinirad +4
In this paper, the redshift evolution of the galactic bar properties, like the bar length, pattern speed, and bar fraction, has been investigated for simulated galaxies at stellar…
Reconciling the magnetic field in central disc galaxies with the dynamical mass using the cosmological simulations
Mohammad Hosseinirad, Fatemeh Tabatabaei, Mojtaba Raouf +1
The Universe is pervaded by magnetic fields in different scales, although for simplicity, they are ignored in most cosmological simulations. In this paper, we use the TNG50, which…
Simulations of star forming main sequence galaxies in Milgromian gravity
Srikanth T. Nagesh, Pavel Kroupa, Indranil Banik +6
We conduct hydrodynamical MOND simulations of isolated disc galaxies over the stellar mass range using the adaptive mesh refinement code \texts…
Bar formation in submaximal discs: a challenge for ΛCDM
Tahere Kashfi, Mahmood Roshan, Benoit Famaey
Bar formation in cosmological simulations of galaxy formation remains challenging. It was previously shown that the fraction of barred galaxies at low stellar masses ($M_*<10^{10.5…
Ionising Feedback Effects on Star Formation in Globular Clusters with Multiple Stellar Populations
Asiyeh Yaghoobi, Joakim Rosdahl, Francesco Calura +2
Using 3D radiation-hydrodynamical simulations, we study the effects of ionising radiation on the formation of second-generation (SG) stars in Globular Clusters (GCs) with multiple…
Three-Body Problem in Modified Dynamics
Hossein Shenavar
General properties of the three-body problem in a model of modified dynamics are investigated. It is shown that the three-body problem in this model shares some characters with the…
Characteristics of Effective Dark Matter in Nonlocal Gravity
Mahmood Roshan, Bahram Mashhoon
Nonlocal gravity (NLG) is a classical nonlocal generalization of Einstein's theory of gravitation that has been constructed in close analogy with the nonlocal electrodynamics of me…
Dynamical Friction and Tidal Interactions
Mahmood Roshan, Bahram Mashhoon
We discuss dynamical friction in an -body system in the presence of tidal interactions caused by a distant external source. Using the distant tide approximation, we develop a pe…
Galactic Scaling Rules in a Modified Dynamical Model
Hossein Shenavar
Schulz (2017) galactic scaling rules, which include baryonic Tully-Fisher relation, have been surveyed in this work within the context of a modified dynamical model. These scaling…
Fast galaxy bars continue to challenge standard cosmology
Mahmood Roshan, Neda Ghafourian, Tahere Kashfi +5
Many observed disc galaxies harbour a central bar. In the standard cosmological paradigm, galactic bars should be slowed down by dynamical friction from the dark matter halo. This…
Barred spiral galaxies in modified gravity theories
Mahmood Roshan, Indranil Banik, Neda Ghafourian +4
When bars form within galaxy formation simulations in the standard cosmological context, dynamical friction with dark matter (DM) causes them to rotate rather slowly. However, almo…
Does modified gravity predict fast stellar bars in spiral galaxies?
Neda Ghafourian, Mahmood Roshan, Shahram Abbassi
The evolution of disk galaxies in modified gravity is studied by using high-resolution N-body simulations. More specifically, we use the weak field limit of two modified gravity th…
Thermal instability of thin accretion disks in the presence of wind and toroidal magnetic field
Asiyeh Habibi, Shahram Abbassi
We study the local thermal stability of thin accretion disks. We present a full stability analysis in the presence of a magnetic field and more importantly wind. For wind, we use a…
Motion of Particles in Solar and Galactic Systems by Using Neumann Boundary Condition
Hossein Shenavar
A new equation of motion, which is derived previously by imposing Neumann boundary condition on cosmological perturbation equations (Shenavar 2016 a), is investigated. By studying…
Pseudo-Evolution of Galaxies in LCDM Cosmology
Vasanth Balakrishna Subramani, Pavel Kroupa, Hossein Shenavar +1
Our knowledge about galaxy evolution comes from transforming observed galaxy properties at different redshifts to co-moving physical scales. This transformation depends on using a…
Local Stability of Galactic Discs in Modified Dynamics
Hossein Shenavar, Neda Ghafourian
The local stability of stellar and fluid discs, under a new modified dynamical model, is surveyed by using WKB approximation. The exact form of the modified Toomre criterion is der…
Stellar Bar evolution in the absence of dark matter halo
Mahmood Roshan
We study the stellar bar growth in high resolution numerical galaxy models with and without dark matter halos. In all models the galactic disk is exponential and the halos are rigi…
Gravitational instability of filamentary molecular clouds, including ambipolar diffusion; Non-isothermal filament
Mohammad Hosseinirad, Shahram Abbassi, Mahmood Roshan +1
Recent observations of the filamentary molecular clouds show that their properties deviate from the isothermal equation of state. Theoretical investigations proposed that the logat…
The Kelvin-Helmholtz instability in the Orion nebula: The effect of radiation pressure
Akram Yaghouti, Mohsen Nejad-Asghar, Shahram Abbassi
The recent observations of rippled structures on the surface of the Orion molecular cloud (Berné et al. 2010), have been attributed to the Kelvin-Helmholtz (KH) instability. The wa…
Global stability of self-gravitating disks in modified gravity
Neda Ghafourian, Mahmood Roshan
We study the global stability of a self-gravitating disk in the context of Modified Gravity (MOG) using N-body simulations. This theory is a relativistic scalar-tensor-vector theor…
Gravitational instability of filamentary molecular clouds, including ambipolar diffusion
Mohammad Hosseinirad, Kazem Naficy, Shahram Abbassi +1
The gravitational instability of a filamentary molecular cloud in non-ideal magnetohydrodynamics is investigated. The filament is assumed to be in hydrostatic equilibrium. We add t…