Research Papers (TP)
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Item Gravitational perturbation of homogeneous collisionless dark matter(Indian Academy of Sciences, 1985-08-12) Padmanabhan, T.; Vasanthi, M. M.The effect of a perturbing mass on a homogeneous collisionless cloud of dark matter is considered in the linear approximation. It is shown by that gravitational potential can have turning points, in sharp contrast with gravitating system of finite extent. The model offers a reasonable explanation for the observed secondary maxima in the destiny distribution of rich clusters . The relevance of the model to the flatness of the rotation curves of galaxies is also discussed.Item Nature and distribution of dark matter: 1. Milky way and dwarf spheroids(Indian Academy of Sciences, 1985-09-20) Padmanabhan, T.; Vasanthi, M. M.We argue that observations on Milky Way and dwarf spheroidals imply existence of individual haloes around dwarf spheroidals. If neutrions (or any other 'hot' particle) provide the dark matter then we show that: (i) Embedding of visible matter inside large (few Mpc) dark matter haloes of about 10 kpc radius around them, and have an (M/L) radio of about 100 kpc in radius. if 'cold' dark matter makes up the haloes, then no significant constraints are obtained. We discuss briefly the effect of these constraints on larger scales.