Measuring the temperature and profiles of Ly alpha absorbers
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Measuring the temperature and profiles of Ly alpha absorbers. / Garzilli, Antonella; Theuns, Tom; Schaye, Joop.
In: Monthly Notices of the Royal Astronomical Society, Vol. 492, No. 2, 02.2020, p. 2193-2207.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Measuring the temperature and profiles of Ly alpha absorbers
AU - Garzilli, Antonella
AU - Theuns, Tom
AU - Schaye, Joop
PY - 2020/2
Y1 - 2020/2
N2 - The distribution of the absorption line broadening observed in the Ly alpha forest carries information about the temperature, T, and widths, lambda(F), of the filaments in the intergalactic medium (IGM), and the background hydrogen photoionization rate, Gamma(HI). In this work, we present and test a new method for inferring T and lambda(F) and Gamma HI from combining the distribution of the absorption line broadening and the median flux. The method accounts for any underlying degeneracies. We apply our method to mock spectra from the reference model of the EAGLE cosmological simulation, and we demonstrate that we are able to reconstruct the IGM properties.
AB - The distribution of the absorption line broadening observed in the Ly alpha forest carries information about the temperature, T, and widths, lambda(F), of the filaments in the intergalactic medium (IGM), and the background hydrogen photoionization rate, Gamma(HI). In this work, we present and test a new method for inferring T and lambda(F) and Gamma HI from combining the distribution of the absorption line broadening and the median flux. The method accounts for any underlying degeneracies. We apply our method to mock spectra from the reference model of the EAGLE cosmological simulation, and we demonstrate that we are able to reconstruct the IGM properties.
KW - methods: data analysis
KW - intergalactic medium
KW - quasars: absorption lines
KW - large-scale structure of Universe
KW - EQUATION-OF-STATE
KW - FLUX PROBABILITY-DISTRIBUTION
KW - SMALL-SCALE STRUCTURE
KW - INTERGALACTIC MEDIUM
KW - GALAXY FORMATION
KW - POWER SPECTRUM
KW - EAGLE SIMULATIONS
KW - HYDRODYNAMICAL SIMULATIONS
KW - DENSITY RELATION
KW - THERMAL HISTORY
U2 - 10.1093/mnras/stz3585
DO - 10.1093/mnras/stz3585
M3 - Journal article
VL - 492
SP - 2193
EP - 2207
JO - Royal Astronomical Society. Monthly Notices
JF - Royal Astronomical Society. Monthly Notices
SN - 0035-8711
IS - 2
ER -
ID: 248237134