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SUMMARY:Intrinsic Alignments of Galaxies - Elisa Chisari (Oxford)
DTSTART:20170306T130000Z
DTEND:20170306T140000Z
UID:TALK70187@talks.cam.ac.uk
CONTACT:Tobias Baldauf
DESCRIPTION:The intrinsic correlations of galaxy shapes are a recognised c
 ontaminant to weak gravitational lensing measurements. Luminous red galaxi
 es have been observed to point radially towards each other\, likely as a c
 onsequence of the action of the tidal field of the large-scale structure o
 n their shapes and orientations\; blue\, disc-like galaxies show no detect
 able alignment from current observations. If these intrinsic alignments ar
 e not accounted for\, cosmological constraints from weak gravitational len
 sing could be severely biased. I will describe the exploration of the intr
 insic alignment signal in the Horizon-AGN cosmological hydrodynamical simu
 lation\, 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. \n
 On the other hand\, I will turn the question around and explore whether th
 ere is useful cosmological information to be extracted from intrinsic alig
 nments with future surveys. For this last part\, I will focus on anisotrop
 ic models of inflation which leave a lasting imprint on the tidal field of
  the large-scale structure\, and the shapes of galaxies.
LOCATION:CMS\, Pav. B\, CTC Common Room (B1.19) [Potter Room]
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