Results 81 to 90 of about 106,851 (294)
Rotation curves of galaxies in GR
, 2023 It has been suggested that the observed flat rotation curves of disk galaxies can be a peculiar effect of General Relativity (GR) rather than evidence for the presence of dark matter (DM) halos in Newtonian gravity. In Ciotti (2022) the problem has been quantitatively addressed by using the well known weak-field, low-velocity gravitomagnetic limit of ...
openaire +2 more sources
Reports in Advances of Physical Sciences, 2020 It is an unsolved mystery that the rotation velocity of a galactic disc is same at any radial distances. The presence of dark matter is expected, but not observed.
Shigeto Nagao
doaj +1 more source
The Time Delays of Gravitational Lens HE 0435–1223: An Early-Type Galaxy with a Rising Rotation Curve [PDF]
, 2005 We present Hubble Space Telescope images and 2 years of optical photometry of the quadruple quasar HE 0435-1223. The time delays between the intrinsic quasar variations are ΔtAD = -14.37, ΔtAB = -8.00, and ΔtAC = -2.10 days. We also observed nonintrinsic
C. Kochanek +7 more
semanticscholar +1 more source
The Nearly Universal Disk Galaxy Rotation Curve
The Astrophysical JournalThe 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 +5 more
doaj +1 more source
Mass Models of the Milky Way and Estimation of Its Mass from the Gaia DR3 Data Set
The Astrophysical Journal, 2023 We use data from the Gaia DR3 data set to estimate the mass of the Milky Way (MW) by analyzing the rotation curve in the range of distances 5 to 28 kpc. We consider three mass models: The first model adds a spherical dark matter (DM) halo, following the ...
Francesco Sylos Labini +3 more
doaj +1 more source
NGC 4244: A Low Mass Galaxy With a Falling Rotation Curve and a Flaring Gas Layer [PDF]
, 1996 I present sensitive high resolution HI VLA B+C+D array observations of the edge-on Scd galaxy NGC 4244. The gas layer of NGC 4244 is rather symmetric in all respects, i.e. the surface density distribution, flaring and warping, so that the rotation curve (
R. Olling
semanticscholar +1 more source
Advanced Robotics Research, EarlyView.This article introduces a soft wearable eyelid sling device incorporating a hydraulic soft artificial muscle (SAM) for achieving complete closure of an eyelid. The SAM is driven by a cam mechanism that provides a displacement profile closely matched with those of a healthy eyelid.
Patrick Pruscino +7 more
wiley +1 more source
Large-Scale Asymmetry of Rotation Curves in Lopsided Spiral Galaxies [PDF]
, 2002 Many spiral galaxies show a large-scale asymmetry with a cos\phi dependence in their rotation curves as well as in their morphology, such as M101 and NGC 628.
Jog, Chanda J.
core +4 more sources
Galaxy rotation curves driven by massive vector fields: Key to the theory of the dark sector [PDF]
, 2013 The non-gauge vector field with as simple as possible Lagrangian (1) turned out an adequate tool for macroscopic description of the main properties of dark matter.
B. E. Meierovich
semanticscholar +2 more sources
Long‐Term Elevated CO2 Improves Soil Health and Rice Yields in Paddy Fields
Advanced Science, EarlyView.Combining the two longest‐running rice free‐air CO2 enrichment experiments with a global data synthesis, this study demonstrates that long‐term elevated CO2 consistently enhances soil health. In rice paddies, this improvement sustains the CO2 fertilization effect over decades.
Fan Jiang +22 more
wiley +1 more source