Simulating the X-ray Forest in a Lambda CDM Universe

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dc.creatorFang, T.
dc.creatorBryan, G. L.
dc.creatorCanizares, Claude R.
dc.date2001-08-29
dc.date.accessioned2026-07-07T01:59:47Z
dc.date.available2026-07-07T01:59:47Z
dc.descriptionNumerical simulations predict that a large number of baryons reside in intergalactic space at temperatures between 10^5-10^7 K. Highly-ionized metals, such as O VII and O VIII, are good tracers of this ``warm-hot intergalactic medium'', or WHIM. For collisionally-ionized gas, the ionization fraction of each ion peaks at some particular temperature (``peak temperatures''), so different ions can therefore trace the IGM at different temperatures. We performed a hydrodynamic simulation to study the metal distributions in the IGM. By studying the distribution functions of H- and He-like O, Si and Fe in a collisionally-ionized IGM and comparing with semi-analytic results based on the Press-Schechter formalism, we find: (1) ions with higher peak temperatures (for instance, Fe XXVI) tend to concentrate around virialized halos, which can be well described by the Press-Schechter distribution, ions with lower peak temperatures are found both in small halos (such as groups of galaxies) and in filaments; (2) lower peak temperature ions are more abundant and should be easily observed; (3) peculiar velocities contribute a significant part to the broadening of the resonant absorption lines.
dc.description4 pages, 4 figures. To appear in the Proceedings of the STScI Symposium, "The Dark Universe: Matter, Energy, and Gravity" (April 2 - 5, 2001), ed. M. Livio. For high resolution figures, see http://space.mit.edu/~fangt/www/x-ray
dc.identifierhttps://arxiv.org/abs/astro-ph/0108479
dc.identifierhttp://arxiv.org/abs/astro-ph/0108479
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/3254
dc.subjectAstrophysics
dc.titleSimulating the X-ray Forest in a Lambda CDM Universe
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