Results 51 to 60 of about 64,819 (265)
Galaxy rotation curve from classical Cepheids [PDF]
Astronomische Nachrichten, 2019 AbstractThe galaxy rotation curve is usually assumed to be flat. However, some galaxies have rotation curves that are lower than the flat rotation curve. In our galaxy, the Keplerian rotation of interstellar clouds in the galactic longitude l = 135° was observed. We use a kinematic approach to derive the rotational velocity of classical Cepheids.
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Modeling the Rising Tails of Galaxy Rotation Curves
Galaxies, 2019 It is well known, but under-appreciated in astrophysical applications, that it is possible for gravity to take on a life of its own in the form of Weyl-curvature-only metrics (note that we are referring to the Weyl-only solutions of ordinary General ...
Fan Zhang
doaj +1 more source
Understanding the shape and diversity of dwarf galaxy rotation curves in ΛCDM [PDF]
, 2016 The shape and wide diversity of dwarf galaxy rotation curves is at apparent odds with dark matter halos in LCDM. We generate mock rotation curve data from dwarf galaxy simulations to show that this owes to bursty star formation driven by stellar feedback.
J. Read +4 more
semanticscholar +1 more source
Galaxy rotation curves and preferred reference frame effects
European Physical Journal C: Particles and Fields, 2019 As an alternative to dark matter models we use generalized Jordan–Brans–Dicke scalar–vector–tensor (JBD-SVT) gravity model to study the behavior of the rotational velocities of test particles moving around galaxies.
Hossein Ghaffarnejad, Razieh Dehghani
doaj +1 more source
The unexpected diversity of dwarf galaxy rotation curves [PDF]
, 2015 We examine the circular velocity profiles of galaxies in A cold dark matter (CDM) cosmological hydrodynamical simulations from the EAGLE and LOCAL GROUPS projects and compare them with a compilation of observed rotation curves of galaxies spanning a wide
K. Oman +11 more
semanticscholar +1 more source
A Study of Dark Matter with Spiral Galaxy Rotation Curves
International Journal of Astronomy and Astrophysics International Journal of Astronomy and Astrophysics, 2019 To constrain the properties of dark matter, we study spiral galaxy rotation curves measured by the THINGS collaboration. A model that describes a mixture of two self-gravitating non-relativistic ideal gases, “baryons” and “dark matter”, reproduces the ...
B. Hoeneisen
semanticscholar +1 more source
Testing feedback-modified dark matter haloes with galaxy rotation curves: estimation of halo parameters and consistency with ΛCDM scaling relations [PDF]
, 2016 Cosmological $N$-body simulations predict dark matter (DM) haloes with steep central cusps (e.g. NFW, Navarro et al. 1996). This contradicts observations of gas kinematics in low-mass galaxies that imply the existence of shallow DM cores.
H. Katz +5 more
semanticscholar +1 more source
The universal galaxy rotation curve
The Astrophysical Journal, 1991 From the analysis of an extended set of selected galaxy rotation curves, it is found that for a given luminosity the rotation curves of spiral galaxies within the optical radius are a universal function. This result implies strong systematic variations of both the amplitude and the profil of the circular velocity with luminosity faint (bright) galaxies
Persic, M., Salucci, P.
openaire +2 more sources
Single Parameter Model for Galaxy Rotation Curves
GalaxiesOne key piece of evidence for dark matter is the rotation-curve problem: the disagreement between measured galactic rotation curves and their luminous mass.
Sophia N. Cisneros +4 more
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A Study of Dark Matter with Spiral Galaxy Rotation Curves. Part II
International Journal of Astronomy and Astrophysics International Journal of Astronomy and Astrophysics, 2019 In Part II of this study of spiral galaxy rotation curves we apply corrections and estimate all identified systematic uncertainties. We arrive at a detailed, precise, and self-consistent picture of dark matter.
B. Hoeneisen
semanticscholar +1 more source