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The Intergalactic Medium
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abstract
The intergalactic medium (IGM) comprises all the matter that lies between galaxies. Hosting the vast majority ($\gtrsim 90\%$) of the baryons in the Universe, the IGM is a critical reservoir and probe for cosmology and astrophysics, providing insights into large-scale structure formation and galaxy evolution. In this Chapter, we present an overview of the general properties of the IGM, focusing on their dependence on cosmic environment and cosmic time. Emphasis is given to the basic physical principles that allow us to model the density, temperature, and ionization state of the IGM, supported by results from cosmological hydrodynamical simulations. We also cover the foundational principles of quasar spectroscopy used to probe the IGM in absorption, with a particular focus on HI absorption lines. Finally, we briefly discuss future prospects and complementary observational techniques to enhance our understanding of the IGM.
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Low-frequency observations of low-mass binary systems with neutron star candidates
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