Characterizing the physical properties of dust grains in a protoplanetary disk is critical to comprehending the planet formation process. Our study presents Atacama Large Millimeter/submillimeter Array (ALMA) high-resolution observation...
We investigate time-dependent inviscid hydrodynamical accretion hows onto a black hole using numerical simulations. We consider accretion that consists of hot tenuous gas with low specific angular momentum and cold dense gas with high specific ang...
F Nakamura   T Matsumoto   T Hanawa   K Tomisaka   
ASTROPHYSICAL JOURNAL 510(1) 274-290 1999年1月
We study the dynamical collapse of isothermal magnetized clouds with two-dimensional axisymmetric numerical simulations. As a model of a cloud, we consider an infinitely long filamentary cloud with a longitudinal magnetic field. An initial model i...
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 50(6) 577-586 1998年12月
We consider gravitational collapse of a filamentary cloud under the assumption that it is axisymmetric and uniform along the axis. The pressure is approximated by a polytrope of P = K rho(gamma). We found a similarity solution for the collapse whe...
Y Nakajima   K Tachihara   T Hanawa   M Nakano   
ASTROPHYSICAL JOURNAL 497(2) 721-735 1998年4月
We study clustering of pre-main-sequence stars in the Orion, Ophiuchus, Chamaeleon, Vela, and Lupus star-forming regions. We calculate the average surface density of companions, Sigma(theta), as a function of angular distance, theta, from each sta...
We present similarity solutions that describe the runaway collapse of a rotating isothermal disk and its subsequent inside-out collapse. The similarity solutions contain the sound speed c(s) and the ratio omega of the specific angular momentum to ...
International Astronomical Union. Asian-Pacific Regional Meeting, 池内, 了, Hearnshaw, J. B., 花輪, 知幸, International Astronomical Union, Astronomical Society of the Pacific, Nihon Tenmon Gakkai
Astronomical Society of the Pacific 2003年 (ISBN:1583811346)