A method for reconstructing the variance of a 3D physical field from 2D observations: application to turbulence in the interstellar medium
A method for reconstructing the variance of a 3D physical field from 2D observations: application to turbulence in the interstellar medium
复制标题
一种根据 2D 观测重建 3D 物理场方差的方法:应用于星际介质中的湍流
DOI:
10.1111/j.1365-2966.2009.16215.x
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发表时间:
2010
影响因子:
4.8
通讯作者:
Brunt C
中科院分区:
文献类型:
--
作者:
Brunt C
We introduce and test an expression for calculating the variance of a physical field in three dimensions using only information contained in the two-dimensional projection of the field. The method is general but assumes statistical isotropy. To test the method we apply it to numerical simulations of hydrodynamic and magnetohydrodynamic turbulence in molecular clouds, and demonstrate that it can recover the 3D normalised density variance with ~10% accuracy if the assumption of isotropy is valid. We show that the assumption of isotropy breaks down at low sonic Mach number if the turbulence is sub-Alfvenic. Theoretical predictions suggest that the 3D density variance should increase proportionally to the square of the Mach number of the turbulence. Application of our method will allow this prediction to be tested observationally and therefore constrain a large body of analytic models of star formation that rely on it.
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影响因子:
6.5
作者:
M. Martin
通讯作者:
M. Martin
DOI:
10.1111/j.1365-2966.2009.14969.x
发表时间:
2009
影响因子:
4.8
作者:
Daniel J. Price;M. Bate
通讯作者:
M. Bate
DOI:
10.1086/345294
发表时间:
2003
期刊:
The Astrophysical Journal
影响因子:
--
作者:
C. Brunt
通讯作者:
C. Brunt
DOI:
10.1086/374325
发表时间:
2003
期刊:
The Astrophysical Journal Letters
影响因子:
--
作者:
E. Vázquez;J. Ballesteros;R. Klessen
通讯作者:
R. Klessen
DOI:
10.1016/j.jcp.2007.07.034
发表时间:
2007
期刊:
J. Comput. Phys.
影响因子:
--
作者:
C. Klingenberg;W. Schmidt;K. Waagan
通讯作者:
K. Waagan