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2 results

  • 10 - Warm-Hot Intergalactic Medium

  • Barbara Ryden, Ohio State University, Richard W. Pogge, Ohio State University
  • Book:
    Interstellar and Intergalactic Medium
    Published online:
    22 September 2021
    Print publication:
    25 March 2021, pp 220-230

  • Summary

    The warm-hot intergalactic medium (WHIM) is the hottest portion of the intergalactic medium; its temperature 105 K < T < 107 K is the result of shock heating as gas flows along the filaments of the cosmic web. Numerical simulations indicate that the WHIM is only now overtaking the cooler DIM as the more massive component of intergalactic gas. The WHIM is difficult to detect – to the point where astronomers long complained of a “missing baryon problem.” However, the cooler portions of the WHIM can be detected by looking for absorption lines of O vi along lines of sight to bright quasars. The portion of the WHIM at T ∼ 106 K can be detected from absorption lines of O vii. The very hottest portion of the WHIM, it is hoped, will be detected from absorption lines of iron, which still clings to its innermost electrons at T ∼ 107 K.

  • Constraints on radio source clustering towards galaxy clusters: application for cm-wavelength simulations of blind sky surveys

  • Bartosz Lew
  • Journal:
    Proceedings of the International Astronomical Union / Volume 11 / Issue S308 / June 2014
    Published online by Cambridge University Press:
    12 October 2016, pp. 301-302
    Print publication:
    June 2014
    • Article
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  • We derive constraints on radio source clustering towards Planck-selected galaxy clusters using the NVSS point source catalog. The constraint can be used for making a more realistic Sunyaev-Zeldovich effect (SZE) mocks, calculating predictions of detectable clusters count and for quantifying source confusion in radio surveys.