The Impact of Different Physical Processes on the Statistics of
Lyman-limit and Damped Lyman-alpha Absorbers
G. Altay, T. Theuns, J. Schaye, C. Booth, и C. Vecchia. (2013)cite arxiv:1307.6879Comment: 21 pages, 16 figures, submitted to MNRAS. The data used to produce all figures along with code to read it can be found here https://bitbucket.org/galtay/hi-cddf-owls-1.
Аннотация
We compute the z = 3 neutral hydrogen column density distribution function
f(NHI) for 19 simulations drawn from the OWLS project using a post-processing
correction for self-shielding calculated with full radiative transfer of the
ionising background radiation. We investigate how different physical processes
and parameters affect the abundance of Lyman-limit systems (LLSs) and damped
Lyman-alpha absorbers (DLAs) including: i) metal-line cooling; ii) the
efficiency of feedback from SNe and AGN; iii) the effective equation of state
for the ISM; iv) cosmological parameters; v) the assumed star formation law
and; vi) the timing of hydrogen reionization . We find that the normalisation
and slope, D = d log10 f /d log10 NHI, of f(NHI) in the LLS regime are robust
to changes in these physical processes. Among physically plausible models,
f(NHI) varies by less than 0.2 dex and D varies by less than 0.18 for LLSs.
This is primarily due to the fact that these uncertain physical processes
mostly affect star-forming gas which contributes less than 10% to f(NHI) in the
the LLS column density range. At higher column densities, variations in f(NHI)
become larger (approximately 0.5 dex at NHI = 10^22 cm^-2 and 1.0 dex at NHI =
10^23 cm^-2) and molecular hydrogen formation also becomes important. Many of
these changes can be explained in the context of self-regulated star formation
in which the amount of star forming gas in a galaxy will adjust such that
outflows driven by feedback balance inflows due to accretion.
Описание
[1307.6879] The Impact of Different Physical Processes on the Statistics of Lyman-limit and Damped Lyman-alpha Absorbers
cite arxiv:1307.6879Comment: 21 pages, 16 figures, submitted to MNRAS. The data used to produce all figures along with code to read it can be found here https://bitbucket.org/galtay/hi-cddf-owls-1
%0 Generic
%1 altay2013impact
%A Altay, Gabriel
%A Theuns, Tom
%A Schaye, Joop
%A Booth, C. M.
%A Vecchia, Claudio Dalla
%D 2013
%K RadTran feedback fnx lls simulation
%T The Impact of Different Physical Processes on the Statistics of
Lyman-limit and Damped Lyman-alpha Absorbers
%U http://arxiv.org/abs/1307.6879
%X We compute the z = 3 neutral hydrogen column density distribution function
f(NHI) for 19 simulations drawn from the OWLS project using a post-processing
correction for self-shielding calculated with full radiative transfer of the
ionising background radiation. We investigate how different physical processes
and parameters affect the abundance of Lyman-limit systems (LLSs) and damped
Lyman-alpha absorbers (DLAs) including: i) metal-line cooling; ii) the
efficiency of feedback from SNe and AGN; iii) the effective equation of state
for the ISM; iv) cosmological parameters; v) the assumed star formation law
and; vi) the timing of hydrogen reionization . We find that the normalisation
and slope, D = d log10 f /d log10 NHI, of f(NHI) in the LLS regime are robust
to changes in these physical processes. Among physically plausible models,
f(NHI) varies by less than 0.2 dex and D varies by less than 0.18 for LLSs.
This is primarily due to the fact that these uncertain physical processes
mostly affect star-forming gas which contributes less than 10% to f(NHI) in the
the LLS column density range. At higher column densities, variations in f(NHI)
become larger (approximately 0.5 dex at NHI = 10^22 cm^-2 and 1.0 dex at NHI =
10^23 cm^-2) and molecular hydrogen formation also becomes important. Many of
these changes can be explained in the context of self-regulated star formation
in which the amount of star forming gas in a galaxy will adjust such that
outflows driven by feedback balance inflows due to accretion.
@misc{altay2013impact,
abstract = {We compute the z = 3 neutral hydrogen column density distribution function
f(NHI) for 19 simulations drawn from the OWLS project using a post-processing
correction for self-shielding calculated with full radiative transfer of the
ionising background radiation. We investigate how different physical processes
and parameters affect the abundance of Lyman-limit systems (LLSs) and damped
Lyman-alpha absorbers (DLAs) including: i) metal-line cooling; ii) the
efficiency of feedback from SNe and AGN; iii) the effective equation of state
for the ISM; iv) cosmological parameters; v) the assumed star formation law
and; vi) the timing of hydrogen reionization . We find that the normalisation
and slope, D = d log10 f /d log10 NHI, of f(NHI) in the LLS regime are robust
to changes in these physical processes. Among physically plausible models,
f(NHI) varies by less than 0.2 dex and D varies by less than 0.18 for LLSs.
This is primarily due to the fact that these uncertain physical processes
mostly affect star-forming gas which contributes less than 10% to f(NHI) in the
the LLS column density range. At higher column densities, variations in f(NHI)
become larger (approximately 0.5 dex at NHI = 10^22 cm^-2 and 1.0 dex at NHI =
10^23 cm^-2) and molecular hydrogen formation also becomes important. Many of
these changes can be explained in the context of self-regulated star formation
in which the amount of star forming gas in a galaxy will adjust such that
outflows driven by feedback balance inflows due to accretion.},
added-at = {2013-07-29T13:49:05.000+0200},
author = {Altay, Gabriel and Theuns, Tom and Schaye, Joop and Booth, C. M. and Vecchia, Claudio Dalla},
biburl = {https://www.bibsonomy.org/bibtex/27fa869a4f98d4457b274dd0f46dfcc8c/miki},
description = {[1307.6879] The Impact of Different Physical Processes on the Statistics of Lyman-limit and Damped Lyman-alpha Absorbers},
interhash = {4eb1cd5236045ed6355a8c5c1f1749c3},
intrahash = {7fa869a4f98d4457b274dd0f46dfcc8c},
keywords = {RadTran feedback fnx lls simulation},
note = {cite arxiv:1307.6879Comment: 21 pages, 16 figures, submitted to MNRAS. The data used to produce all figures along with code to read it can be found here https://bitbucket.org/galtay/hi-cddf-owls-1},
timestamp = {2013-07-29T13:49:05.000+0200},
title = {The Impact of Different Physical Processes on the Statistics of
Lyman-limit and Damped Lyman-alpha Absorbers},
url = {http://arxiv.org/abs/1307.6879},
year = 2013
}