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2 results

  • 7 - The Distances of the Pulsars

  • from Part I - Discoveries and Techniques
  • Andrew Lyne, University of Manchester, Francis Graham-Smith, University of Manchester, Benjamin Stappers, University of Manchester
  • Book:
    Pulsar Astronomy
    Published online:
    21 July 2022
    Print publication:
    04 August 2022, pp 105-118

  • Summary

    Pulsar distances are obtained from their frequency dispersion, geometrically from annual parallax, and from optical identifiction with supernova remnants, globular clusters and binary companions. For most pulsars, distances are only available from observation of effects of propagation in the interstellar medium, particularly neutral hydrogen absorption and frequency dispersion. Interpretation of the dispersion measure requires a model of the electron distribution through the Galaxy.

  • Extreme Dispersions of Semicoherent and Mixed System Lifetimes

  • Part of
  • Patryk Miziuła, Tomasz Rychlik
  • Journal:
    Journal of Applied Probability / Volume 52 / Issue 1 / March 2015
    Published online by Cambridge University Press:
    30 January 2018, pp. 117-128
    Print publication:
    March 2015
    • Article
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  • We consider semicoherent and mixed systems with exchangeable components. We present sharp lower and upper bounds on various dispersion measures (in particular, variance and median absolute deviation) of the system lifetime, expressed in terms of the system signature and the dispersion of a single component lifetime. We construct joint exchangeable distributions of component lifetimes with two-point marginals which attain the bounds in the limit.