The cold gas accretion and merging of galaxies are two important physical mechanisms which contribute to the building up of galaxies at various epochs of the universe. Thus, it is crucial to understand the role of gas ...

Active Galactic Nuclei (AGN), amongst the most luminous sources in the Universe (L = 1042 − 1046 erg s −1 ), emit radiation over the entire electromagnetic band. Though AGN are known to be powered by the accretion of matter ...

Accurate wavelength calibration is an important factor for any measure ment with high resolution spectrographs. Stellar spectrum comprises of dis crete absorption or emission lines whose position is precisely determined ...

Context: Starting from the first discovery of extrasolar planet or exoplanet around a sun-like star, more than 5,000 confirmed exoplanets have been detected till now. But still we have very less information and interpretations ...

The most challenging limitation in the transit photometry method arises from the noises in the photometric signal. In particular, the ground-based telescopes are heavily affected by the noise due to the perturbation in ...

After more than six decades of the pioneering work of Burbidge, Burbidge, Fowler and Hoyle (1957), which first suggested the production channels and the evolution of neutron-capture elements, many details still remain ...

In order to fill the void of observation of bright near infrared astronomical sources, we propose a Near Infrared photometer operating from a low latitude astronomical site. As part of this thesis work, design decisions ...

The Echelle spectrograph operating at Vainu Bappu Telescope (VBT) is a general-purpose instrument designed for high-resolution spectroscopy. It was considered for precision Radial Velocity (RV) measurements without altering ...

Astronomy today is in the path of constructing large telescopes. Due to several manufacturing and maintenance difficulties, large telescopes of more than 8 m are predominantly segmented. To fulfill the need for its growing ...