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공공누리This item is licensed Korea Open Government License

dc.contributor.author
이상민
dc.date.accessioned
2019-08-28T07:41:02Z
dc.date.available
2019-08-28T07:41:02Z
dc.date.issued
2011-06-02
dc.identifier.issn
0004-637x
dc.identifier.uri
https://repository.kisti.re.kr/handle/10580/13966
dc.description.abstract
Using a TVD MHD code, we have simulated the nonlinear development
of the Parker instability in an isothermal magnetized gas disk ,
which is under the influence of self-gravity. Our objective is to
investigate how the Jeans and Parker instabilities compete with
disruptive tendency of the convection in nonlinear stage of
evolution, and to know whether the Parker-Jeans instability can be
a mechanism for the formation of the larger scale structures in the
Galaxy.

When the perturbation wavelengths are larger than a Jeans critical wavelength, a cooperative action of the Parker and Jeans instabilities can
completely suppress the disruptive behavior of the convective
instability and leads the ISM gas material into large-scale
structures of high density, whose masses and sizes correspond to HI
superclouds rather than GMCs. The gas disk develops
the vertical filamentary structures near the dense core instead of the
chaotic sheet structures that are often seen from simulations of
the classical Parker instability. The low density filaments
connect the dense part to the diffuse region far from the disk central plane.
The filamentary structure is similar to galactic diffuse vertical structure.
When the wavelength of given perturbations is so short that the Jeans
instability may not get triggered, the self-gravitating, magnetized gas disk seems to reach an equilibrium state different from the initial one.
dc.language
eng
dc.relation.ispartofseries
The Astrophysical journal
dc.title
Parker Instability in a Self-Gravitating Magnetized Gas Disk. III. Nonlinear Development of the Parker Instability
dc.citation.number
2
dc.citation.startPage
101
dc.citation.volume
734
dc.subject.keyword
instabilities
dc.subject.keyword
clouds
dc.subject.keyword
magnetic fields
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7. KISTI 연구성과 > 학술지 발표논문
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