Fragmentation of a Magnetized Filamentary Molecular Cloud Rotating around its Axis
نویسندگان
چکیده
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, ρ0(r) = ρc (1 + r 2/8H2)−2, where ρc 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 (φ-) components with a strength of B0(r) ∝ √
منابع مشابه
First MHD Simulation of Collapse and Fragmentation of Magnetized Molecular Cloud Cores
This is the first paper about the fragmentation and mass outflow in the molecular cloud by using three-dimensional MHD nested-grid simulations. The binary star formation process is studied paying particular attention to the fragmentation of a rotating magnetized molecular cloud. We assume an isothermal rotating and magnetized cylindrical cloud in hydrostatic balance. Non-axisymmetric as well as...
متن کاملCollapse and Fragmentation of Rotating Magnetized Clouds. II. Binary Formation and Fragmentation of First Cores
Subsequent to Paper I, the evolution and fragmentation of a rotating magnetized cloud are studied with use of three-dimensional MHD nested-grid simulations. After the isothermal runaway collapse, an adiabatic gas forms a protostellar first core at the center of the cloud. When the isothermal gas is stable for fragmentation in a contracting disk, the adiabatic core often breaks into several frag...
متن کاملDynamical Collapse of Magnetized Molecular Clouds: Formation of Self-Similarly Collapsing Disks
We followed fragmentation of magnetized lamentary clouds and formation of disks with two-dimensional numerical simulations. A lamentary cloud with longitudinal magnetic elds fragments to form geometrically thin disks perpendicular to the magnetic eld. Each disk collapses self-similarly toward the lament axis, keeping quasi-static equilibrium in the direction parallel to the axis. With some simp...
متن کاملCollapse and Fragmentation of Rotating Magnetized Clouds. I. Magnetic Flux - Spin Relation
We discuss evolution of the magnetic flux density and angular velocity in a molecular cloud core, on the basis of three-dimensional numerical simulations, in which a rotating magnetized cloud fragments and collapses to form a very dense optically thick core of > 5 × 10 cm. As the density increases towards the formation of the optically thick core, the magnetic flux density and angular velocity ...
متن کاملHigh-fidelity view of the structure and fragmentation of the high-mass, filamentary IRDC G11.11-0.12
Star formation in molecular clouds is intimately linked to their internal mass distribution. We present an unprecedentedly detailed analysis of the column density structure of a high-mass, filamentary molecular cloud, namely IRDC G11.11-0.12 (G11). We use two novel column density mapping techniques: high-resolution (FWHM = 2′′ , or ∼0.035 pc) dust extinction mapping in nearand midinfrared, and ...
متن کامل