|COOKIES: By using this website you agree that we can place Google Analytics Cookies on your device for performance monitoring.|
Intrinsic Alignments of Galaxies
If you have a question about this talk, please contact Tobias Baldauf.
The intrinsic correlations of galaxy shapes are a recognised contaminant to weak gravitational lensing measurements. Luminous red galaxies have been observed to point radially towards each other, likely as a consequence of the action of the tidal field of the large-scale structure on their shapes and orientations; blue, disc-like galaxies show no detectable alignment from current observations. If these intrinsic alignments are not accounted for, cosmological constraints from weak gravitational lensing could be severely biased. I will describe the exploration of the intrinsic alignment signal in the Horizon-AGN cosmological hydrodynamical simulation, in preparation for future weak lensing surveys. In particular, I will describe the different contributions to intrinsic alignments, their redshift evolution and the relative galaxy-dark matter halo alignment. On the other hand, I will turn the question around and explore whether there is useful cosmological information to be extracted from intrinsic alignments with future surveys. For this last part, I will focus on anisotropic models of inflation which leave a lasting imprint on the tidal field of the large-scale structure, and the shapes of galaxies.
This talk is part of the Cosmology lunch series.
This talk is included in these lists:
Note that ex-directory lists are not shown.
Other listsSeminars on Quantitative Biology @ CRUK Cambridge Institute Training Opportunities Seminar on Religion, Conflict and Its Aftermath
Other talksGenetic prediction of cardiovascular disease Athena SWAN Surgery Mutational processes in the human genome Explorations in computing motion and their implications for motion processing in monkey and man. Living in Happiness - Spirituality in Daily Life series The persistence of large-scale compositional heterogeneity in the Earth’s mantle