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Simulations of the Intergalactic Medium

Published online by Cambridge University Press:  23 September 2016

Romeel Davé
Romeel Davé*
Affiliation:
Astronomy Department, the University of Arizona, 933 North Cherry Avenue, Tucson, AZ, USA 85721

Abstract

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I present an epochal review of baryons in the intergalactic medium (IGM), from the reionization epoch until today. Recent observations indicate a protracted period of reionization, suggesting multiple populations of reionizers; detection of these z ≳ 6 sources is a key goal that is now coming within reach. The optical Lyman alpha forest (2 ≲ z ≲ 4) is well-described by the Fluctuating Gunn-Peterson Approximation, but recent observations of galaxies and metal lines associated with Lyα absorbers remain puzzling. IGM studies at z ≲ 1.5 are progressing rapidly thanks to ultraviolet absorption line studies of both Lyα absorbers and the warm-hot intergalactic medium. Cosmological hydrodynamic simulations have played an integral part in these advances, and have helped to revolutionize our understanding of the IGM at various epochs. Working together, observations and theory continue to expand our knowledge of the IGM as the earliest stage of galaxy formation and the dominant reservoir of baryons at all redshifts.

Type
Session V: Intergalactic Medium
Information
Symposium - International Astronomical Union , Volume 216: Maps of the Cosmos , 2005 , pp. 251 - 265
Copyright
Copyright © Astronomical Society of the Pacific 2005 

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