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High-Resolution Studies of the Multiple-Core Systems toward Cluster-Forming Regions Including Massive Stars
Hiro Saito, Masao Saito, Yoshinori Yonekura +1
We present the results of C18O observations by the Nobeyama Millimeter Array toward dense clumps with radii of ~ 0.3 pc in six cluster-forming regions including massive (proto)star…
Magnetically Regulated Star Formation in 3D: The Case of Taurus Molecular Cloud Complex
Fumitaka Nakamura, Zhi-Yun Li
We carry out three-dimensional MHD simulations of star formation in turbulent, magnetized clouds, including ambipolar diffusion and feedback from protostellar outflows. The calcula…
Protostellar Turbulence Driven by Collimated Outflows
Fumitaka Nakamura, Zhi-Yun Li
The majority of stars are thought to form in clusters. Cluster formation in dense clumps of molecular clouds is strongly influenced, perhaps controlled, by supersonic turbulence. W…
Cluster Formation in Protostellar Outflow-Driven Turbulence
Zhi-Yun Li, Fumitaka Nakamura
Most, perhaps all, stars go through a phase of vigorous outflow during formation. We examine, through 3D MHD simulation, the effects of protostellar outflows on cluster formation.…
On the Hydrodynamic Interaction of Shock Waves with Interstellar Clouds. II. The Effect of Smooth Cloud Boundaries on Cloud Destruction and Cloud Turbulence
Fumitaka Nakamura, Christopher F. McKee, Richard I. Klein +1
The effect of smooth cloud boundaries on the interaction of steady planar shock waves with interstellar clouds is studied using a high-resolution local AMR technique with a second-…
Quiescent Cores and the Efficiency of Turbulence-Accelerated, Magnetically Regulated Star Formation
Fumitaka Nakamura, Zhi-Yun Li
The efficiency of star formation, defined as the ratio of the stellar to total (gas and stellar) mass, is observed to vary from a few percent in regions of dispersed star formation…
Low-Mass Star Formation, Triggered by Supernova in Primordial Clouds
Masahiro N. Machida, Kohji Tomisaka, Fumitaka Nakamura +1
The evolution of a gas shell, swept by the supernova remnant of a massive first generation star, is studied with H_2 and HD chemistry taken into account. When a first-generation st…
Magnetically Regulated Star Formation in Turbulent Clouds
Zhi-Yun Li, Fumitaka Nakamura
We investigate numerically the combined effects of supersonic turbulence, strong magnetic fields and ambipolar diffusion on cloud evolution leading to star formation. We find that,…
Binary and Multiple Star Formation in Magnetic Clouds: Bar Growth and Fragmentation
Fumitaka Nakamura, Zhi-Yun Li
We study the non-axisymmetric evolution of magnetized clouds, using a 2D MHD code based on the physically motivated thin-disk approximation. We found that such clouds become unstab…
Fragmentation of Magnetically Subcritical Clouds into Multiple Supercritical Cores and the Formation of Small Stellar Groups
Zhi-Yun Li, Fumitaka Nakamura
Isolated low-mass stars are formed in dense cores of molecular clouds. In the standard picture, the cores are envisioned to condense out of strongly magnetized clouds through ambip…
The Stellar Initial Mass Function in Primordial Galaxies
Fumitaka Nakamura, Masayuki Umemura
In the context of star formation through fragmentation of an extremely metal-deficient protogalactic cloud, the gravitational collapse of filamentary gas clouds is explored with 1D…
Nonaxisymmetric Evolution of Magnetically Subcritical Clouds: Bar Growth, Core Elongation, and Binary Formation
Fumitaka Nakamura, Zhi-Yun Li
We have begun a systematic numerical study of the nonlinear growth of nonaxisymmetric perturbations during the ambipolar diffusion-driven evolution of initially magnetically subcri…
The Stellar IMF in Very Metal-Deficient Gas
Fumitaka Nakamura, Masayuki Umemura
In the context of the star formation through the fragmentation of an extremely metal-deficient protogalactic cloud, the gravitational collapse of filamentary gas clouds is explored…
On the Initial Mass Function of Population III Stars
Fumitaka Nakamura, Masayuki Umemura
The collapse and fragmentation of filamentary primordial gas clouds are explored using 1D and 2D hydrodynamical simulations coupled with the nonequilibrium processes of H2 formatio…
Formation of an Infalling Disklike Envelope around a Protostar
Fumitaka Nakamura
We examined the gravitational contraction of isothermal molecular cloud cores with slow rotation by means of two-dimensional numerical simulations. Applying a sink-cell method, we…
On the Mass of Population III Stars
Fumitaka Nakamura, Masayuki Umemura
Performing 1D hydrodynamical calculations coupled with non-equilibrium processes for H2 formation, we pursue the thermal and dynamical evolution of filamentary primordial clouds an…
Fragmentation of a Magnetized Filamentary Molecular Cloud Rotating around its Axis
Tomoaki Matsumoto, Fumitaka Nakamura, Tomoyuki Hanawa
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 i…