Astronomy and Astrophysics – Astrophysics
Scientific paper
1994-05-09
Astronomy and Astrophysics
Astrophysics
Submitted to PASJ, Latex file, 18 page + 13 figures available on request, DPNU-94-12
Scientific paper
The dynamical instability of a self-gravitating magnetized filamentary cloud was investigated while taking account of rotation around its axis. The filamentary cloud of our model is supported against self-gravity in part by both a magnetic field and rotation. The density distribution in equilibrium was assumed to be a function of the radial distance from the axis, $ \rho _0 (r) \, = \, \rho _{\rm c} \, ( 1 \, + \, r ^2 / 8 H ^2 ) ^{-2} $, where $ \rho _{\rm c} $ and $ H $ are model parameters specifying the density on the axis and the length scale, respectively; the magnetic filed was assumed to have both longitudinal ($z$-) and azimuthal ($\varphi$-) components with a strength of $ B _0 (r) \, \propto \, \sqrt{ \rho _0 (r) } $. The rotation velocity was assumed to be $ v _{0\varphi} \, = \, \Omega _{\rm c} \, r \, (1 \, + \, r ^2 / 8 H ^2 ) ^{-1/2} $. We obtained the growth rate and eigenfunction numerically for (1) axisymmetric $ ( m \, = \, 0 ) $ perturbations imposed on a rotating cloud with a longitudinal magnetic field, (2) non-axisymmetric $ ( m \, = \, 1 ) $ perturbations imposed on a rotating cloud with a longitudinal magnetic filed, and (3) axisymmetric perturbations imposed on a rotating cloud with a helical magnetic field. The fastest growing perturbation is an axisymmetric one for all of the model clouds studied. Its wavelength is $ \lambda _{\rm max} \, \le \, 11.14 \, H $ for a non-rotating cloud without a magnetic field, and is shorter
Hanawa Tomoyuki
Matsumoto Tomoaki
Nakamura Fumitaka
No associations
LandOfFree
Fragmentation of a Magnetized Filamentary Molecular Cloud Rotating around its Axis does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Fragmentation of a Magnetized Filamentary Molecular Cloud Rotating around its Axis, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fragmentation of a Magnetized Filamentary Molecular Cloud Rotating around its Axis will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-244886