Oral Presentation

Magneto-Hydrodynamical Analysis of High-Velocity Compact Molecular Clouds

Author(s): Yansong Guo(NAGOYA UNIVERSITY), Shu-ichiro Inutsuka(NAGOYA UNIVERSITY)

Presenter: YanSong Guo (NAGOYA UNIVERSITY)

Previously, we studied the gravitational scattering of a molecular cloud by a compact massive object by means of three dimensional hydrodynamics simulation with radiative cooling/heating and chemical reactions, and examine the recent claim for the evidence of intermediate-mass black hole suggested by the observation of broad molecular line emission from a high velocity compact molecular cloud (CO-0.40-0.22) in the central molecular zone of the Milky Way Galaxy. Now we are extending our analysis to the structure found near the center of our Galaxy where the existence of very strong magnetic field is reported. To study a more realistic dynamics of gravitational scattering of the molecular cloud, we developed a high-resolution shock-capturing numerical scheme based on smoothed particle magnetohydrodynamics with a Riemann solver and the method of characteristics combined with non-equilibrium chemistry and radiative cooling/heating processes. These effects may drastically change the gas state and the appearance of molecular line emissions. Our calculations confirm the previous interpretation of the cloud (CO-0.40-0.22) that the extremely broad velocity width ($\sim 100 \rm{kms^{-1}}$) is due to gravitational scattering by a $10^5$ solar mass black hole.