Using the second order tensor virial equations and the equation for the rate of change of the kinetic energy tensor, the authors follow the dynamical evolution of a star cluster with anisotropic velocity distribution. They ...

We have considered the collision of a pair of disc-sphere galaxies under the impulsive approximation to study the variation of the energy change of the disc due to the passage of a spherical galaxy. Various collision ...

Numerical simulations with a small computer have been performed to investigate the tidal influence of a larger galaxy on a smaller companion. A criterion is developed for disruption of the satellite galaxy. The behaviour ...

We present evidence to show that the Madras Observatory-to which Indian Institute of Astrophysics (IIA) traces its origin-was formed, and observations started, in the year 1786. We also discuss how the erroneous date of ...

It is argued that the occurrence of nuclear activity and supernovae in E and S0 galaxies are correlated and a result of accretion of gas by the galaxy.

There are three types of supernovae: two subtypes SNIa and Ib; and SNII. Late type galaxies produce all types of SN, whereas early types (E, SO, and non-Magellanic irregulars IO) have hosted only SNIa. The recently identified ...

Tensor virial equations are used to investigate the dynamical evolution of a cluster of mass points characterized by a spheroidal (homogeneous or heterogeneous) distribution of matter and an isotropic distribution of ...