Radiative transfer calculations of the diffuse ionized gas in disc galaxies with cosmic ray feedback
Radiative transfer calculations of the diffuse ionized gas in disc galaxies with cosmic ray feedback
复制标题
具有宇宙射线反馈的盘状星系中扩散电离气体的辐射传输计算
DOI:
10.1093/mnras/sty554
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发表时间:
2018
影响因子:
4.8
通讯作者:
Peters, Thomas
中科院分区:
文献类型:
--
作者:
Vandenbroucke, Bert;Wood, Kenneth;Girichidis, Philipp;Hill, Alex S;Peters, Thomas
The large vertical scale heights of the diffuse ionized gas (DIG) in disc galaxies are challenging to model, as hydrodynamical models including only thermal feedback seem to be unable to support gas at these heights. In this paper, we use a three-dimensional Monte Carlo radiation transfer code to post-process disc simulations of the Simulating the Life-Cycle of Molecular Clouds project that include feedback by cosmic rays. We show that the more extended discs in simulations including cosmic ray feedback naturally lead to larger scale heights for the DIG which are more in line with observed scale heights. We also show that including a fiducial cosmic ray heating term in our model can help to increase the temperature as a function of disc scale height, but fails to reproduce observed DIG nitrogen and sulphur forbidden line intensities. We show that, to reproduce these line emissions, we require a heating mechanism that affects gas over a larger density range than is achieved by cosmic ray heating, which can be achieved by fine tuning the total luminosity of ionizing sources to get an appropriate ionizing spectrum as a function of scale height. This result sheds a new light on the relation between forbidden line emissions and temperature profiles for realistic DIG gas distributions.
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DOI:
10.1086/317210
发表时间:
2000
期刊:
The Astrophysical Journal
影响因子:
--
作者:
J. Mathis
通讯作者:
J. Mathis
DOI:
10.1088/0004-637x/767/1/87
发表时间:
2013
期刊:
The Astrophysical Journal
影响因子:
--
作者:
Joshua Wiener;E. Zweibel;S. Peng Oh
通讯作者:
S. Peng Oh
DOI:
--
发表时间:
2014
期刊:
影响因子:
--
作者:
S. Walch;P. Girichidis;T. Naab;A. Gatto;S. Glover;R. Wünsch;R. Klessen;R. Klessen;R. Klessen;P. Clark;T. Peters;D. Derigs;C. Baczynski
通讯作者:
C. Baczynski
DOI:
10.1111/j.1365-2966.2004.07846.x
发表时间:
2004
影响因子:
4.8
作者:
K. Wood;J. Mathis
通讯作者:
J. Mathis
DOI:
10.1086/432043
发表时间:
2005
期刊:
The Astrophysical Journal
影响因子:
--
作者:
G. Madsen;R. J. Reynolds
通讯作者:
R. J. Reynolds