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Determining the Cosmic Distance Scale with Galaxy Clusters

Determining the Cosmic Distance Scale with Galaxy Clusters. Erik Reese University of California, Berkeley. The Sunyaev-Zel’dovich Effect. BIMA & OVRO. Distance Calculation. With geometry of the cluster. Hubble Constant. With z and geometry of the universe.

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Determining the Cosmic Distance Scale with Galaxy Clusters

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  1. Determining the Cosmic Distance Scale with Galaxy Clusters Erik Reese University of California, Berkeley

  2. The Sunyaev-Zel’dovich Effect

  3. BIMA & OVRO

  4. Distance Calculation With geometry of the cluster

  5. Hubble Constant With z and geometry of the universe Independent of the extra-galactic distance ladder! For a sample of clusters, fit to the theoretical DA relation, where H0 is the normalization

  6. Angular Diameter Distances: Present

  7. H0 Current Results • Ryle → 5 clusters(Jones et al. 2003) • OVRO 5m → 7 clusters(Mason et al. 2000) • OVRO/BIMA → 18 clusters(Reese et al. 2002)

  8. H0 Current Results • Combined → 41 distances Reminder: All ROSAT data

  9. Systematics

  10. Chandra

  11. Angular Diameter Distances: Chandra

  12. DA Future

  13. Supernovae Type Ia

  14. Challenges • Systematics • Modeling • Sample selection • Sample sizes • Unbiassed selection criteria • Wonky clusters • Convince X-ray TACs • High redshift→cosmology

  15. SZE Surveys • Large samples of clusters • High redshift clusters • Clean selection function Holder et al. 2000

  16. Simulations Courtesy of Martin White

  17. Summary • H0 independent of extragalactic distance ladder • Systematics are approachable • SZE Surveys • Large numbers of clusters • High redshift • Sample selection • Symbiotic with cluster number counts

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