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• W1978161708 abstract "Recent far-ultraviolet (FUV) absorption line measurements of low-redshift quasars have unveiled a population of intervening broad H i Ly α absorbers (BLAs) with large Doppler parameters ( km s-1). If the large width of these lines is dominated by thermal line broadening, the BLAs may trace highly-ionized gas in the warm-hot intergalactic medium (WHIM) in the temperature range K, a gas phase that is expected to contain a large fraction of the baryons at low redshift. In this paper we use a hydrodynamical simulation to study frequency, distribution, physical conditions, and baryon content of the BLAs at . From our simulated spectra we derive a number of BLAs per unit redshift of for H i absorbers with log (cm(km s, km s-1, and total hydrogen column densities N(H ii cm-2. The baryon content of these systems is , which represents ∼25 percent of the total baryon budget in our simulation. Our results thus support the idea that BLAs represent a significant baryon reservoir at low redshift. BLAs predominantly trace shock-heated collisionally ionized WHIM gas at temperatures log . About 27 percent of the BLAs in our simulation originate in the photoionized Ly α forest (log ) and their large line widths are determined by non-thermal broadening effects such as unresolved velocity structure and macroscopic turbulence. Our simulation implies that for a large-enough sample of BLAs in FUV spectra it is possible to obtain a reasonable approximation of the baryon content of these systems solely from the measured H i column densities and b values." @default.
• W1978161708 created "2016-06-24" @default.
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• W1978161708 date "2006-05-04" @default.
• W1978161708 modified "2023-09-25" @default.
• W1978161708 title "Simulations of thermally broadened H I Ly <i>α</i> absorption arising in the warm-hot intergalactic medium" @default.
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• W1978161708 doi "https://doi.org/10.1051/0004-6361:20054556" @default.
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