PIRSA:09020040

Video URL

https://pirsa.org/09020040

The Tail that Wags the Dog: Observational Constraints on Dark Matter Halos in Nearby Galaxies

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

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

          @misc{ scivideos_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 for Theoretical Physics},
            year = {2009},
            month = {feb},
            note = {PIRSA:09020040 see, \url{https://scivideos.org/index.php/pirsa/09020040}}
          }

Kristine Spekkens Royal Military College of Canada

Talk numberPIRSA:09020040
DOI10.48660/09020040
Source RepositoryPIRSA
Collection
Talk Type Scientific Series
Subject

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.