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2 results

  • 8 - Observations of Large-Scale Structure

  • Ruth Durrer, Université de Genève
  • Book:
    The Cosmic Microwave Background
    Published online:
    10 December 2020
    Print publication:
    17 December 2020, pp 296-328

  • Summary

    In this chapter we present the analysis of the large scale matter distribution within linear perturbation theory in a fully relativistic way. We take into account that only directions and redshifts are observable while lengths scales are always inferred from a cosmological model. We first introduce the traditional density and redshift space distortion contribution to the observed uctuations and then proceed to discuss the smaller lensing and large scale relativistic terms. We express the clustering properties of matter in terms of directly observable quantities and study their scale and redshift dependence. We also discuss ‘intensity mapping’ a new observational technique which will hopefully bear fruit in the near future. Also this chapter has been newly added in the second edition.

  • The Hubble Constant from (CLASS) Gravitational Lenses

  • L. V. E. Koopmans, The CLASS Collaboration
  • Journal:
    Publications of the Astronomical Society of Australia / Volume 18 / Issue 2 / 2001
    Published online by Cambridge University Press:
    05 March 2013, pp. 179-181
    • Article
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  • One of the main objectives of the Cosmic Lens All-Sky Survey (CLASS) collaboration has been to find gravitational lens (GL) systems at radio wavelengths that are suitable for the determination of time delays between image pairs. The survey is now near completion and at least 18 GL systems have been found. Here, I will discuss our efforts to measure time delays from several of these systems with the ultimate aim of constraining the Hubble Constant (H0). Thus far three CLASS GL systems (B0218+357, B1600+434 and B1608+656) have yielded measurements of time delays, from which values of H0 ≈ 60–70 km s−1 Mpc−1 have been estimated. Although most GL systems give similar values of H0, statistical and systematic uncertainties are still considerable. To reduce these uncertainties, I will mention two monitoring programs that we are undertaking to (re)measure time delays in 14 CLASS GL systems and address several important issues for the near future.