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Nandini Sahu

Recent detections of gravitational waves after about 100 years of prediction by Albert Einstein on the basis of his general theory of relativity, has opened a new window to look up and explore specially the dark side of cosmos. A key source of gravitational waves is the coalescence of the resultant black hole pair during collisional evolution of two galaxies. In order to determine the expected ensemble of gravitational waves we require a prior knowledge of galactic merger rate and the black hole mass residing approximately at the center of a galaxy.

My Ph.D. project aims to improve the famous Black hole mass - Galactic spheroid mass relation at its high mass end using near infrared images of about 40 early type galaxies obtained with Spritzer Space Telescope. By better defining this mass scaling relation, we can not only address the new issue of allegedly over-massive black holes in some galaxies but determine the expected gravitational radiation signal coming from the collision of the biggest black holes in our universe. This can be achieved because we already know the galactic spheroid masses from observational surveys, and we will be able to assign improved black hole masses from above relation to each of these galaxies.

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