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Bryony Martin SKA Conference 2011

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  • 1. Peculiar Velocities in Supernova Cosmology Kessler, et al. 2009 Bryony Martin MSc, Department of Astronomy, University of Cape Town Supervised by: Dr Kurt van der Heyden & Prof Bruce Bassett SKA SA Postgraduate Bursary Conference, November 2011
  • 2. Peculiar velocitiesAdditional motions specific to individual galaxies Recession velocity i al r ad Overdensity Peculiar velocity HT SIG tr a F EO ns LIN ve rs e• Recession velocity due to Hubble flow• Peculiar velocity due to matter distribution of local environment – baryonic and dark matter2 Peculiar Velocities in Supernova Cosmology Bryony Martin 2011
  • 3. Type Ia supernovaeThe standard candles of the universe Kim, et al. 19973 Peculiar Velocities in Supernova Cosmology Bryony Martin 2011
  • 4. Supernova cosmologyCalculating constraints on cosmological parameters Kessler, et al. 2009 Kessler, et al. 20094 Peculiar Velocities in Supernova Cosmology Bryony Martin 2011
  • 5. Supernova cosmology with peculiar velocitiesPeculiar velocities induce Doppler effects in supernova observations Kessler, et al. 2009 Doppler shifting5 Peculiar Velocities in Supernova Cosmology Bryony Martin 2011
  • 6. Supernova cosmology with peculiar velocitiesPeculiar velocities induce Doppler effects in supernova observations Kessler, et al. 2009 Doppler shifting INACCURATE PARAMETER CONSTRAINTS Inaccurate best-fit cosmology6 Peculiar Velocities in Supernova Cosmology Bryony Martin 2011
  • 7. Simulation dataSimulated galaxies with explicit velocity information www.mpa-garching.mpg.de Kitzbichler & White, 20077 Peculiar Velocities in Supernova Cosmology Bryony Martin 2011
  • 8. Simulated galaxiesMock survey galaxy catalogues showing structure8 Peculiar Velocities in Supernova Cosmology Bryony Martin 2011
  • 9. Supernova ratesUsing galaxy properties to predict the presence of type Ia supernovae Mannucci et al, 20059 Peculiar Velocities in Supernova Cosmology Bryony Martin 2011
  • 10. Simulated Type Ia SupernovaeSupernova dataset with known peculiar velocities10 Peculiar Velocities in Supernova Cosmology Bryony Martin 2011
  • 11. Hubble diagramConstructed using simulated supernova data11 Peculiar Velocities in Supernova Cosmology Bryony Martin 2011
  • 12. Shifts in Ωm for various maximum redshiftsAverage shifts in Ωm are within 1σ12 Peculiar Velocities in Supernova Cosmology Bryony Martin 2011
  • 13. Shifts in H0 for various maximum redshiftsAverage shifts in H0 are ~1σ13 Peculiar Velocities in Supernova Cosmology Bryony Martin 2011
  • 14. Calculated values of Ωm using true and observed redshiftsCalculated values are 1-2σ from the fiducial value of Ωm14 Peculiar Velocities in Supernova Cosmology Bryony Martin 2011
  • 15. Calculated values of H0 using true and observed redshiftsCalculated values using observed redshifts are 2σ less than the fiducial value of H015 Peculiar Velocities in Supernova Cosmology Bryony Martin 2011
  • 16. SummaryRESULTS Simulated type Ia supernova dataset with peculiar velocity information• Parameter estimates from simulated Hubble diagrams using both cosmological and observed redshifts• Measured shifts in parameters which are roughly of the order of 1σ16 Peculiar Velocities in Supernova Cosmology Bryony Martin 2011