PIRSA:09020040 Scientific Series Cosmology

DOI10.48660/09020040

Series: Cosmology and Gravitation

Spekkens, K. (2009). The Tail that Wags the Dog: Observational Constraints on Dark Matter Halos in Nearby Galaxies. Perimeter Institute. https://pirsa.org/09020040

Spekkens, Kristine. The Tail that Wags the Dog: Observational Constraints on Dark Matter Halos in Nearby Galaxies. Perimeter Institute, Feb. 20, 2009, https://pirsa.org/09020040 

@misc{ pirsa_PIRSA:09020040,
  doi = {10.48660/09020040},
  url = {https://pirsa.org/09020040},
  author = {Spekkens, Kristine},
  keywords = {Cosmology},
  language = {en},
  title = {The Tail that Wags the Dog: Observational Constraints on Dark Matter Halos in Nearby Galaxies},
  publisher = {Perimeter Institute},
  year = {2009},
  month = {feb},
  note = {PIRSA:09020040 see, \url{https://pirsa.org}}
}

Abstract

The standard cosmological framework explains an impressive range of large-scale astrophysical phenomena, but an agreement between its predictions and the properties of the dark matter halos of nearby galaxies has not been established. In this talk, I will highlight some key observables that constrain galaxy structure and some key differences between cosmological predictions and halo properties inferred from these measurements. I will also discuss proposed 'observational' solutions to some of these discrepancies, such as the role of coherent non-circular motions in spiral galaxies and the measured abundance of gas-rich, starless halos in the nearby Universe.

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