56 citations · 213 across the 11 of their papers we have counts for
11 papers
Self-gravitational Force Calculation of Second Order Accuracy Using Multigrid Method on Nested Grids
Hsiang-Hsu Wang, Chien-Chang Yen
We present a simple and effective multigrid-based Poisson solver of second-order accuracy in both gravitational potential and forces in terms of the one, two and infinity norms. Th…
Self-gravitational Force Calculation of High-Order Accuracy for Infinitesimally Thin Gaseous Disks
Hsiang-Hsu Wang, Ming-Cheng Shiue, Rui-Zhu Wu +1
Self-gravitational force calculation for infinitesimally thin disks is important for studies on the evolution of galactic and protoplanetary disks. Although high-order methods have…
A Magnetic Field Connecting the Galactic Center Circumnuclear Disk with Streamers and Mini-spiral -Implications from 850 m Polarization Data
Pei-Ying Hsieh, Patrick M. Koch, Woong-Tae Kim +3
Utilizing James Clark Maxwell Telescope (JCMT) 850 m SCUPOL dust polarization data, we investigate the configuration of the magnetic () field in the circumnuclear disk (CND)…
Molecular Gas Feeding the Circumnuclear Disk of the Galactic Center
Pei-Ying Hsieh, Patrick M. Koch, Paul T. P. Ho +5
The interaction between a supermassive black hole (SMBH) and the surrounding material is of primary importance in modern astrophysics. The detection of the molecular 2-pc circumnuc…
Self-Gravitational Force Calculation of Infinitesimally Thin Gaseous Disks on Nested Grids
Hsiang-Hsu Wang, Ronald E. Taam, David C. C. Yen
We extend the work of Yen et al. (2012) and develop 2nd order formulae to accommodate a nested grid discretization for the direct self-gravitational force calculation for infinites…
Self-Gravitational Force Calculation of Second Order Accuracy for Infinitesimally Thin Gaseous Disks in Polar Coordinates
Hsiang-Hsu Wang, David C. C. Yen, Ronald E. Taam
Investigating the evolution of disk galaxies and the dynamics of proto-stellar disks can involve the use of both a hydrodynamical and a Poisson solver. These systems are usually ap…
Spiral Density Waves in M81. II. Hydrodynamic Simulations for Gas Response to Stellar Spiral Density Waves
Hsiang-Hsu Wang, Wing-Kit Lee, Ronald E. Taam +2
Gas response to the underlying stellar spirals is explored for M81 using unmagnetized hydrodynamic simulations. Constrained within the uncertainty of observations, 18 simulations a…
Formation of Isothermal Disks around Protoplanets. I. Introductory Three-Dimensional Global Simulations for Sub-Neptune-Mass Protoplanets
Hsiang-Hsu Wang, Defu Bu, Hsien Shang +1
The regular satellites found around Neptune ($\approx 17~M_{\Earth}$) and Uranus ($\approx 14.5~M_{\Earth}$) suggest that past gaseous circumplanetary disks may have co-existed wit…
Spiral Density Waves in M81. I. Stellar Spiral Density Waves
Chien-Chang Feng, Lien-Hsuan Lin, Hsiang-Hsu Wang +1
Aside from the grand-design stellar spirals appearing in the disk of M81, a pair of stellar spiral arms situated well inside the bright bulge of M81 has been recently discovered by…
Hydrodynamical Simulations of the Barred Spiral Galaxy NGC 1097
Lien-Hsuan Lin, Hsiang-Hsu Wang, Pei-Ying Hsieh +3
NGC 1097 is a nearby barred spiral galaxy believed to be interacting with the elliptical galaxy NGC 1097A located to its northwest. It hosts a Seyfert 1 nucleus surrounded by a cir…
Equilibrium Initialization and Stability of Three-Dimensional Gas Disks
Hsiang-Hsu Wang, Ralf S. Klessen, Cornelis P. Dullemond +2
We present a new systematic way of setting up galactic gas disks based on the assumption of detailed hydrodynamic equilibrium. To do this, we need to specify the density distributi…