STATISTICAL TESTS OF GALACTIC DYNAMO THEORY
STATISTICAL TESTS OF GALACTIC DYNAMO THEORY
复制标题
银河动力理论的统计检验
DOI：
10.3847/1538-4357/833/1/43
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
A. Russ Taylor
中科院分区：
文献类型：
--
作者：
L. Chamandy;A. Shukurov;A. Russ Taylor
Mean-field galactic dynamo theory is the leading theory to explain the prevalence of regular magnetic fields in spiral galaxies, but its systematic comparison with observations is still incomplete and fragmentary. Here we compare predictions of mean-field dynamo models to observational data on magnetic pitch angle and the strength of the mean magnetic field. We demonstrate that a standard dynamo model produces pitch angles of the regular magnetic fields of nearby galaxies that are reasonably consistent with available data. The dynamo estimates of the magnetic field strength are generally within a factor of a few of the observational values. Reasonable agreement between theoretical and observed pitch angles generally requires the turbulent correlation time τ to be in the range of 10– , in agreement with standard estimates. Moreover, good agreement also requires that the ratio of the ionized gas scale height to root-mean-square turbulent velocity increases with radius. Our results thus widen the possibilities to constrain interstellar medium parameters using observations of magnetic fields. This work is a step toward systematic statistical tests of galactic dynamo theory. Such studies are becoming more and more feasible as larger data sets are acquired using current and up-and-coming instruments.
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影响因子：
0.9
作者：
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通讯作者：
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影响因子：
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DOI：
10.1093/mnrasl/slu156
发表时间：
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期刊：
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影响因子：
--
作者：
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通讯作者：
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影响因子：
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作者：
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