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The universe in a box - Thermal effects in the standard cold dark matter scenarioAn attempt is made to compute the evolution of a representative piece of the universe at a minimal resolution of a flux-based mesh code coupled with a standard particle-mesh dark matter code. It is found that, on scales greater than 1/h Mpc, dark matter is more clumped than gas. Bremsstrahlung and Compton cooling are unimportant on scales of 1 Mpc or greater. Shocks gradually heat the gas, leaving most of it in voids at T = 10 exp 3.5 K or less, but with a small fraction reaching T = 10 million K or more. Ultraviolet and soft X-ray emission from the heated gas is significant, providing an important part of the background radiation field and significant ionizing of the intergalactic medium. The mean induced Delta T/T for microwave background radiation in the Rayleigh-Jeans part of the spectrum is 1.1 x 10 to the -6th with fluctuation of 5.6 x 10 to the -7th on arcmin scales and a mean y parameter of 5.5 x 10 to the -7th, which is potentially detectable by the COBE satellite.
Document ID
19910026266
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Cen, R. Y.
(Princeton Univ. Observatory NJ, United States)
Ostriker, Jeremiah P.
(Princeton University Observatory, NJ, United States)
Jameson, Anthony
(Princeton Univ. Observatory NJ, United States)
Liu, Feng
(Princeton University NJ, United States)
Date Acquired
August 14, 2013
Publication Date
October 20, 1990
Publication Information
Publication: Astrophysical Journal, Part 2 - Letters
Volume: 362
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
91A10889
Funding Number(s)
CONTRACT_GRANT: NAGW-765
CONTRACT_GRANT: NSF AST-86-15845
Distribution Limits
Public
Copyright
Other

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