Isolated Galaxies and Isolated Satellite Systems (2009)
Ann, H. B., Park, Changbom, Choi, Yun-Young
We search for isolated galaxies using a volume-limited sample of galaxies with 0.02< z < 0.04742 from SDSS DR7 supplemented by bright galaxies. We devise a diagnostic tool to select isolated galaxies...
Effect of Central Mass Concentration on the Formation of Nuclear Spirals in Barred Galaxies (2008)
Thakur, Parijat, Ann, H. B., Jiang, Ing-Guey
We have performed smoothed particle hydrodynamics (SPH) simulations to study the response of the central kiloparsec region of a gaseous disk to the imposition of nonaxisymmetric bar potentials. The...
Ann, H. B., Park, Changbom, Choi, Yun-Young
We have studied the radial distribution of the early (E/S0) and late (S/Irr) types of satellites around bright host galaxies. We made a volume-limited sample of 4,986 satellites brighter than M_r =...
Lee Lee, H. B. Ann, K. H. Kwon
We have studied the response of molecular clouds in the Galactic disk to a rotating bar by conducting Smoothed Particle Hydrodynamics (SPH) simulations for the Galaxy in order to understand the...
M. G. Lee, ...
We present results of photometric observations of two old open clusters: NGC 2506 and NGC 2420. V-band time-series and UBVI absolute CCD photometric observations were carried out to search for...
Self-consistent triaxial de Zeeuw-Carollo Models (2007)
Thakur, Parijat, Jiang, Ing-Guey, Das, Mousumi, Chakraborty, D. K., Ann, H. B.
We use the usual method of Schwarzschild to construct self-consistent solutions for the triaxial de Zeeuw & Carollo (1996) models with central density cusps. ZC96 models are triaxial generalisations...
A family of triaxial modified Hubble mass models: effects of the additional radial functions (2004)
Das, Mousumi, Thakur, Parijat, Ann, H. B.
The projected properties of triaxial generalization of the modified Hubble mass models are studied. These models are constructed by adding the additional radial functions, each multiplied by a...
Formation of Nuclear Spirals in Barred Galaxies (2004)
We have performed smoothed particle hydrodynamics (SPH) simulations for the response of the gaseous disk to the imposed moderately strong non-axisymmetric potentials. The model galaxies are composed...
Nuclear Spirals and Supermassive Black Holes (2004)
We have performed SPH simulations for the response of the gaseous disks to the imposed potentials including those from bars and SMBHs. Evolution of the nuclear regions of gaseous disks depends...
Hydrodynamic Simulations for the Nuclear Morphology of NGC 4314 (2002)
We performed SPH simulations to study the nuclear morphology of a barred galaxy NGC 4314. We have constructed the mass models based on the results of a profile decomposition into disk, bulge, and bar...
Young Populations in the Nuclei of Barred Galaxies (2002)
We have conducted a $UBVRI$ and $H_{\alpha}$ CCD photometry of 5 barred galaxies, NGC 2523, NGC 2950, NGC 3412, NGC 3945 and NGC 5383, along with SPH simulations, in order to understand the origin of...
Ann, H. B., Lee, S. H., Sung, H., Lee, M. G., ...
We have initiated a long-term project, the BOAO photometric survey of open clusters, to enlarge our understanding of galactic structure using UBVI CCD photometry of open clusters which have been...
Bulges of Two Barred Galaxies: NGC 3412 and NGC 3941 (1999)
We have conducted near-infrared (J- and H-band) surface photometry for two early type barred galaxies, NGC 3412 and NGC 3941. The bulges of NGC 3412 and NGC 3941 show isophotal twists which indicate...
Ann, H. B., Lee, M. G., Chun, M. Y., ...
Open clusters are useful tools to investigate the structure and evolution of the Galactic disk. We have started a long-term project to obtain UBVI CCD Photometry of open clusters which were little...
Lee, C. W., Lee, H. M., Ann, H. B., Kwon, K. H.
We have performed Smoothed Particle Hydrodynamic (SPH) simulations to study the response of molecular clouds in the Galactic disk to a rotating bar and their subsequent evolution in the Galactic...