Enigmatic velocity dispersions of ultradiffuse galaxies in light of modified gravity theories and the radial acceleration relation

@article{Islam2020EnigmaticVD,
  title={Enigmatic velocity dispersions of ultradiffuse galaxies in light of modified gravity theories and the radial acceleration relation},
  author={Tousif Islam},
  journal={Physical Review D},
  year={2020},
  volume={102}
}
  • Tousif Islam
  • Published 22 October 2019
  • Physics
  • Physical Review D
Recent observations of anomalous line-of-sight velocity dispersions of two ultra-diffuse galaxies (UDGs) provide a stringent test for modified gravity theories. While NGC 1052-DF2 exhibits an extremely low dispersion value ($\sigma \sim 7.8_{-2.2}^{+5.6}$ km/s), the reported dispersion value for NGC 1052-DF44 is quite high ($\sigma \sim 41.0 \pm 8$ km/s). For DF2, the dynamical mass is almost equal to the luminous mass suggesting the galaxy have little to no `dark matter' in $\Lambda$CDM… Expand

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References

SHOWING 1-10 OF 74 REFERENCES
Physical Review Letters 117
  • 201101
  • 2016
and M
  • Haslbauer, arXiv preprint arXiv:1909.07978
  • 2019
Progress in Particle and Nuclear Physics
Taking the format of two hardbound volumes a year, this series discusses new developments in the field at a level suitable for the general nuclear and particle physicist, and also, in greaterExpand
A New Method to Constrain the Origins of Dark-matter-free Galaxies and Their Unusual Globular Clusters
In this paper, we explore the observational evidence for a collisional origin for the recently discovered dark matter (DM)-free ultra-diffuse galaxies observed in the NGC 1052 group. We have computedExpand
A Scenario for Ultradiffuse Satellite Galaxies with Low Velocity Dispersions: The Case of [KKS 2000]04
A scenario for achieving a low velocity dispersion for the galaxy NGC 1052-DF2 and similar galaxies is presented. A progenitor galaxy of total mass $< 5\times 10^{10}\; \textrm{M}_\odot$ infallingExpand
A Second Galaxy Missing Dark Matter in the NGC 1052 Group
The ultra-diffuse galaxy NGC1052-DF2 has a very low velocity dispersion, indicating that it has little or no dark matter. Here we report the discovery of a second galaxy in this class, residing inExpand
A distance of 13 Mpc resolves the claimed anomalies of the galaxy lacking dark matter
The claimed detection of a diffuse galaxy lacking dark matter represents a possible challenge to our understanding of the properties of these galaxies and galaxy formation in general. The galaxy,Expand
A new formulation of the external field effect in MOND and numerical simulations of ultra-diffuse dwarf galaxies $-$ application to NGC 1052-DF2 and NGC 1052-DF4.
The ultra-diffuse dwarf galaxy NGC 1052-DF2 (DF2) has ten (eleven) measured globular clusters (GCs) with a line-of-sight velocity dispersion of $\sigma=7.8^{+5.2}_{-2.2}\,$km/sExpand
Does the galaxy NGC1052-DF2 falsify Milgromian dynamics?
A great challenge in present-day physics is to understand whether the observed internal dynamics of galaxies is due to dark matter matter or due to a modification of the law of gravity. Recently, vanExpand
Globular clusters as a probe for Weyl conformal gravity
  • Tousif Islam
  • Physics
  • Monthly Notices of the Royal Astronomical Society
  • 2019
Eventual flattening of velocity dispersion profiles of some galactic globular clusters (GCs) in the Milky Way cannot be explained in the framework of Newtonian gravity and hence in general theoryExpand
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