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Seeing the Invisible: Observing the Dark Side of the Universe

Seeing the Invisible: Observing the Dark Side of the Universe. Sarah Bridle University College London. What we see. What we don’t see. Missing energy: Dark Energy (energy that is not matter). Missing matter: Dark Matter (matter that doesn’t shine).

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Seeing the Invisible: Observing the Dark Side of the Universe

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  1. Seeing the Invisible: Observing the Dark Side of the Universe Sarah Bridle University College London

  2. What we see

  3. What we don’t see Missing energy: Dark Energy (energy that is not matter) Missing matter: Dark Matter (matter that doesn’t shine)

  4. Seeing the Invisible:Is there something in between us and the wall and tree?

  5. Using the bending of light to see the invisible

  6. 90 years ago Eddington confirmed Einstein’s prediction during a solar eclipse

  7. Unlensed Lensed

  8. Unlensed Lensed

  9. Cosmic Shear Tyson et al 2002

  10. Gravitational Lensing Galaxies seen through dark matter distribution analogous to Streetlamps seen through your bathroom window

  11. Atmosphere and Telescope Convolution with kernel Real data: Kernel size ~ Galaxy size

  12. Pixelisation Sum light in each square Real data: Pixel size ~ Kernel size /2

  13. Noise Mostly Poisson. Some Gaussian and bad pixels. Uncertainty on total light ~ 5 per cent

  14. www.great08challenge.info

  15. Results from the HST COSMOS Survey

  16. The Largest ever Survey with HST

  17. The Invisible The Visible

  18. In 3 Dimensions

  19. Future prospects The Dark Energy Survey • Cosmic microwave background radiation • Distribution of dark matter at early times • Distribution of galaxies • Some clues to distribution of matter • Galaxy velocities • Galaxies fall towards dark matter clumps • Gravitational lensing

  20. The camera: DECam Mechanical Interface of DECam Project to the Blanco CCD Readout Focal plane (detector) Filters Shutter Hexapod Corrector Lenses

  21. The DES Collaboration The Dark Energy Surveyis an international collaboration of ~100 scientists from ~20 institutions Fermilab, UIUC/NCSA, University of Chicago, LBNL, NOAO, University of Michigan, University of Pennsylvania, Argonne National Laboratory, Ohio State University, Santa-Cruz/SLAC Consortium UK Consortium: UCL, Cambridge, Edinburgh, Portsmouth, Sussex Spain Consortium: CIEMAT, IEEC, IFAE Brazil Consortium: ObservatorioNacional, CBPF,Universidade Federal do Rio de Janeiro, Universidade Federal do Rio Grande do Sul CTIO

  22. A geometrical probe of the universe proposed for Cosmic Vision All-sky optical imaging for gravitational lensing PI Refregier All-sky near-IR spectra to H=22 for BAO PI Cimatti = +

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