Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-10-17
New Astron. 9 (2004) 573-583
Astronomy and Astrophysics
Astrophysics
22 pages, 10 figures. Accepted to New Astronomy. Movies and a higher resolution version of the paper are available at http:/
Scientific paper
10.1016/j.newast.2004.03.003
We simulate the evolution of the intergalactic medium (IGM) in a universe dominated by a cosmological constant. We find that within a few Hubble times from the present epoch, the baryons will have two primary phases: one phase composed of low-density, low-temperature, diffuse, ionized gas which cools exponentially with cosmic time due to adiabatic expansion, and a second phase of high-density, high-temperature gas in virialized dark matter halos which cools much more slowly by atomic processes. The mass fraction of gas in halos converges to ~40% at late times, about twice its calculated value at the present epoch. We find that in a few Hubble times, the large scale filaments in the present-day IGM will rarefy and fade away into the low-temperature IGM, and only islands of virialized gas will maintain their physical structure. We do not find evidence for fragmentation of the diffuse IGM at later times. More than 99% of the gas mass will maintain a steady ionization fraction above 80% within a few Hubble times. The diffuse IGM will get extremely cold and dilute but remain highly ionized, as its recombination time will dramatically exceed the age of the universe.
Loeb Abraham
Nagamine Kentaro
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