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Inferring the IGM thermal history during reionization with the Lyman a forest power spectrum at redshift z - 5
Ist Teil von
Monthly notices of the Royal Astronomical Society, 2016-12, Vol.463 (3), p.2335-2335
Ort / Verlag
London: Oxford University Press
Erscheinungsjahr
2016
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
We use cosmological hydrodynamical simulations to assess the feasibility of constraining the thermal history of the intergalactic medium during reionization with the Ly alpha forest at ... The integrated thermal history has a measurable impact on the transmitted flux power spectrum that can be isolated from Doppler broadening at this redshift. We parametrize this using the cumulative energy per proton, ..., deposited into a gas parcel at the mean background density, a quantity that is tightly linked with the gas density power spectrum in the simulations. We construct mock observations of the line-of-sight Ly alpha forest power spectrum and use a Markov Chain Monte Carlo approach to recover ... at redshifts ... A statistical uncertainty of ~20 per cent is expected (at 68 per cent confidence) at ...using high-resolution spectra with a total redshift path length of ... and a typical signal-to-noise ratio of 15 per pixel. Estimates for the expected systematic uncertainties are comparable, such that existing data should enable a measurement of ... to within ~30 per cent. This translates to distinguishing between reionization scenarios with similar instantaneous temperatures at ..., but with an energy deposited per proton that differs by 2-3 eV over the redshift interval ... For an initial temperature of ... K following reionization, this corresponds to the difference between early (...) and late (...) reionization in our models. (ProQuest: ... denotes formulae/symbols omitted.)