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The Multi-Scale Multi-Phase Circumgalactic Medium: Observed and Simulated
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These are exciting times for studies of galaxy formation and the growth of structures. New observatories and advanced simulations are revolutionising our understanding of the cycling of matter into, through, and out of galaxies. This chapter first describes why baryons are essential for galaxy evolution, providing a key test of Lambda-Cold Dark Matter cosmological model. In particular, we describe a basic framework to convert measurements of the gas properties observed in absorption spectra into global estimates of the condensed (stars and cold gas) matter mass densities. We then review our current understanding of the cycling of baryons from global to galactic scales, in the so-called circumgalactic medium. The final sections are dedicated to future prospects, identifying new techniques and up-coming facilities as well as key open questions. This chapter is complemented with a series of hands-on exercises which provide a practical guide to using publicly available hydrodynamical cosmological simulations. Beyond providing a direct connection between new observations and advanced simulations, these exercises give the reader the necessary tools to make use of these theoretical models to address their own science questions. Ultimately, our increasingly accurate description of the circumgalactic medium reveals its crucial role in transforming the pristine early Universe into the rich and diverse Universe of the present day.
Forward citations
Cited by 6 Pith papers
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Cooler Phases of the Circumgalactic Medium Are More Centrally Concentrated: Constraints from Multiphase Absorption Lines
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