Results 91 to 100 of about 957 (185)

Galaxy rotation curves. The theory

, 2013
The non-gauge vector field with as simple as possible Lagrangian (\ref{Lagrangian}) turned out an adequate tool for macroscopic description of the main properties of dark matter. The dependence of the velocity of a star on the radius of the orbit $V\left(r\right) $ -- galaxy rotation curve -- is derived analytically from the first principles ...
openaire   +2 more sources

Global monopoles in Horndeski theory

European Physical Journal C: Particles and Fields
In this article, global monopole solutions will be presented for the Horndeski theory by solving linearized field equations. We obtain two different classes of solutions depending on whether the Horndeski scalar field is massless or massive.
M. Haluk Seçuk, Özgür Delice
doaj   +1 more source

Hydrostatic Equilibrium Constraints in X-COP Galaxy Clusters: Testing Hyperconical Modified Gravity in Hot-gas-dominated Regions

The Astrophysical Journal
Modified Newtonian dynamics (MOND) was originally proposed to model galaxy rotation curves without dark matter. However, MOND presents difficulties in explaining the radial acceleration relation observed in galaxy clusters, and moreover, it does not ...
Robert Monjo
doaj   +1 more source

Decoding the Galactic Twirl: The Downfall of Milky Way–Mass Galaxy Rotation Curves in the FIRE Simulations

The Astrophysical Journal
Recent measurements of the Milky Way rotation curve found a sharp decline at around 15–20 kpc from the center of the Galaxy, suggesting that the Galactic dark matter halo is much less massive than predicted by other dynamical tracers.
Xiaowei Ou, Lina Necib, Andrew Wetzel, Anna Frebel, Jeremy Bailin, Micah Oeur   +5 more
doaj   +1 more source

The Nearly Universal Disk Galaxy Rotation Curve

The Astrophysical Journal
The universal rotation curve (URC) of disk galaxies was originally proposed to predict the shape and amplitude of any rotation curve (RC) based solely on photometric data.
Raj Patel, Nikhil Arora, Stéphane Courteau, Connor Stone, Matthew Frosst, Lawrence Widrow   +5 more
doaj   +1 more source

Perfect fluid dark matter: a viability test with galaxy rotation curves

European Physical Journal C: Particles and Fields
The anomalous rotation curves of galaxies provide compelling evidence for dark matter, yet its fundamental nature and distribution remain key unresolved issues in astrophysics.
Jan Kuncewicz
doaj   +1 more source

Modeling the Mass Distribution and Gravitational Potential of Nearby Disk Galaxies: Implications for the Interstellar Medium Dynamical Equilibrium

The Astrophysical Journal
We characterize stellar, gas, and dark matter mass distributions for 17 nearby massive disk galaxies from the PHANGS sample. This allows us to compute the gravitational potential that vertically confines the interstellar gas and determines its ...
Vivek Vijayakumar, Jiayi Sun, Eve C. Ostriker, Enrico M. Di Teodoro, Konstantin Haubner, Chang-Goo Kim, Adam K. Leroy, Miguel Querejeta   +7 more
doaj   +1 more source

Rotation curves velocities obtained by warm low-density plasma simulating dark halos and “dark matter”

AIP Advances
The free electron model with Boltzmann statistics for spherical low-density plasmas is developed further, with asymptotic relations obtaining the density of electrons, mass densities, and the potentials of such plasmas.
Y. Ben-Aryeh
doaj   +1 more source

Diverse Rotation Curves of Galaxies in a Simulated Universe: The Observed Dependence on Stellar Mass and Morphology Reproduced

The Astrophysical Journal
We use the IllustrisTNG cosmological hydrodynamical simulation to study the rotation curves of galaxies in the local universe. To do that, we first select the galaxies with 9.4 
Daeun Jeong, Ho Seong Hwang, Haeun Chung, Yongmin Yoon   +3 more
doaj   +1 more source

A Large-scale Ring Galaxy at z = 2.2 Revealed by JWST/NIRCam: Kinematic Observations and Analytical Modelling

The Astrophysical Journal
A unique galaxy at z = 2.2, zC406690, has a striking clumpy large-scale ring structure that persists from rest-frame UV to near-infrared, yet has an ordered rotation and lies on the star formation main sequence.
A. Nestor Shachar, A. Sternberg, R. Genzel, D. Liu, S. H. Price, C. Pulsoni, L. J. Tacconi, R. Herrera-Camus, N. M. Förster Schreiber, A. Burkert, J. B. Jolly, D. Lutz, S. Wuyts, C. Barfety, Y. Cao, J. Chen, R. Davies, F. Eisenhauer, J. M. Espejo Salcedo, L. L. Lee, M. Lee, T. Naab, S. Pastras, T. T. Shimizu, E. Sturm, G. Tozzi, H. Übler   +26 more
doaj   +1 more source