Missing Baryons and the Warm-Hot Intergalactic Medium
نویسندگان
چکیده
منابع مشابه
Missing baryons and the warm-hot intergalactic medium.
Stars and gas in galaxies, hot intracluster medium, and intergalactic photo-ionized gas make up at most half of the baryons that are expected to be present in the universe. The majority of baryons are still missing and are expected to be hidden in a web of warm-hot intergalactic medium. This matter was shock-heated during the collapse of density perturbations that led to the formation of the re...
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This review briefly discusses the use of UV absorption lines in the spectra of low-redshift QSOs for the study of the physical conditions, metallicity, and baryonic content of the low−z IGM, with emphasis on implications for the missing baryons problem. Current results on the statistics and baryonic content of intervening, low−z O VI and Lyα absorption-line systems are presented with some comme...
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Approximately 30− 40% of all baryons in the present day universe reside in a warm-hot intergalactic medium (WHIM), with temperatures between 10 < T < 10 K. This is a generic prediction from six hydrodynamic simulations of currently favored structure formation models having a wide variety of numerical methods, input physics, volumes, and spatial resolutions. Most of these warm-hot baryons reside...
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At low redshift (z < 2), almost half of the baryons in the Universe are not found in bound structures like galaxies and clusters and therefore most likely reside in a Warm-Hot Intergalactic Medium (WHIM), as predicted by simulations. Attempts to detect WHIM filaments at cosmological distances in absorption towards bright background sources have yielded controversial results that I review here. ...
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ژورنال
عنوان ژورنال: Science
سال: 2008
ISSN: 0036-8075,1095-9203
DOI: 10.1126/science.1151400