On the relative importance of different microphysics on the D-type expansion of galactic H ii regions
On the relative importance of different microphysics on the D-type expansion of galactic H ii regions
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不同微观物理对银河系 H ii 区 D 型扩张的相对重要性
DOI:
10.1093/mnras/stv1814
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发表时间:
2015
影响因子:
4.8
通讯作者:
Haworth T
中科院分区:
文献类型:
--
作者:
Haworth T
Radiation hydrodynamics (RHD) simulations are used to study many astrophysical phenomena; however, they require the use of simplified radiation transport and thermal prescriptions to reduce computational cost. In this paper, we present a systematic study of the importance of microphysical processes in RHD simulations using the example of D-type Hiiregion expansion. We compare the simplest hydrogen-only models with those that include: ionization of H, He, C, N, O, S and Ne, different gas metallicity, non-LTE metal-line-blanketed stellar spectral models of varying metallicity, radiation pressure, dust and treatment of photodissociation regions. Each of these processes is explicitly treated using modern numerical methods rather than parametrization. In line with expectations, changes due to microphysics in either the effective number of ionizing photons or the thermal structure of the gas lead to differences in D-type expansion. In general, we find that more realistic calculations lead to the onset of D-type expansion at smaller radii and a slower subsequent expansion. Simulations of star-forming regions using simplified microphysics are therefore likely overestimating the strength of radiative feedback. We find that both variations in gas metallicity and the inclusion of dust can affect the ionization front evolution at the 10–20 per cent level over 500 kyr, which could substantially modify the results of simplified 3D models including feedback. Stellar metallicity, radiation pressure and the inclusion of photodissociation regions are all less-significant effects at the 1 per cent level or less, rendering them of minor importance in the modelling the dynamical evolution of Hiiregions.
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DOI:
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发表时间:
2015
期刊:
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2014
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DOI:
10.1086/524378
发表时间:
2007-10
期刊:
The Astrophysical Journal Supplement Series
影响因子:
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通讯作者:
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DOI:
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发表时间:
2013
期刊:
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