Research

“The measure of greatness in a scientific idea is the extent to which it stimulates thought and opens up new lines of research.”

- Paul A.M. Dirac

Previous Research Summary during PhD : A sample of seven nearby Wolf–Rayet (WR) galaxies had been taken for the study. These Wolf-Rayet (WR) galaxies are extragalactic objects whose integrated spectra shows broad emission features associated to WR stars. The presence of the Wolf-Rayet stars are reflected in galaxy spectrum as two important broad features, the blue WR bump (between 4650 -4690 ̊A, mainly due to Niii, Nv and Heii) and the red WR bump (at ∼5808 ̊A, due to C iv emission line). These objects are very important to study the early phases of starbursts and to determine the burst properties. These analysis of seven galaxies includes the study of morphologies, colours, star-formation rates (SFRs),metallicities and stellar populations, combining broad-band and narrow-band photometry with low-resolution optical spectroscopy.

The UBVRI observations were made with the 2-m HCT (Himalayan Chandra Telescope) and (One Galaxy with) 1-m ARIES telescope. The spectroscopic data were obtained using the Hanle Faint Object Spectrograph Camera (HFOSC) mounted on the 2-m HCT. The observed galaxies are NGC 1140, IRAS 07164+5301,NGC 3738, UM 311, NGC 6764, NGC 4861 and NGC 3003. The optical spectra were used to search for the faint WR features, to confirm that the ionization of the gas is caused by the massive stars, and to quantify the oxygen abundance of each galaxy using several independent empirical calibrations. The optical broad-band colours in combination with Starburst99 models to estimate the internal reddening and the age of the dominant underlying stellar population within all these regions. These star forming regions within listed sample galaxies were identified through the narrow band photometry of continuum subtracted H α images. Then underlying old stellar populations and very young stellar populations of these knots are determined via starburst99 model using the suitable model for the derived metallicity.

For more click Link : http://mnras.oxfordjournals.org/content/439/1/157.full.pdf+html

HCT - HIMALAYAN CHANDRA TELESCOPE, Hanle.

(~4km above sea level)

Projects guidance for the students during (2015-2017)

Through Loyola College, Research Park.

3 UG Students under " Construction of Optical Telescope "

3 UG Students under " Construction of Radio Telescope".

M.Sc projects guidance:

3 PG students

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Current Research Interest (s) Key Words: Public Outreach and Education; Celestial Mechanics, Dynamical Astronomy, Positional Astronomy, Dynamics of Solar System Bodies, Orbital Mechanics, Observational Astronomy & Radio Astronomical Techniques and STEM, STEAM (Interdisciplinary) approach of Research in Astronomy. (Previous Work - Extragalactic Astronomy - Photometric and Spectroscopic Studies of Wolf Rayet Galaxies).

STEAM: An acronym for Science, Technology, Engineering, Arts, Mathematics

STEM : An acronym for Science, Technology, Engineering and Math education