Abstract Details

Name: Sonika Piridi
Affiliation: National Institute of Technology, Rourkela
Conference ID: ASI2021_468
Title : Study of Galactic Structure using UVIT star counts
Authors and Co-Authors : Ranjan Kumar (NIT Rourkela), A.C.Pradhan (NIT Rourkela), Devendra K Ojha (TIFR, Mumbai), Sonika Piridi(NIT Rourkela), Tapas Baug (Kavli Institute for Astronomy and Astrophysics, Japan), S.K.Ghosh (TIFR, Mumbai)
Abstract Type : Poster
Abstract Category : Stars, ISM and Galaxy
Abstract : The Ultra-Violet Imaging Telescope (UVIT) onboard the Astrosat satellite carries out simultaneous observations in Far-UV (FUV) and Near-UV (NUV). Out of the various filters, we use the F154W (BaF2) and N263M (NUVB4) filters to obtain the star counts at different galactic regions. Observations in the UV region help us in identifying the hot sources such as white dwarfs (WDs) and Blue Horizontal Branch stars (BHBs) which are otherwise scarce in other wavebands. We use the star counts method along with the infrared (IR) color cut method to separate out the extra-galactic sources from the point sources. We chose regions at the Galactic center (GC), Galactic Anti-center (GAC), and one at the South Galactic pole (SGP) and verified our obtained UV star counts with the Besancon model, a population synthesis model. We consider the double exponential density law to find the scale height and scale length of the galaxy. Finally, we fit the density function to our observed star counts and obtained two distinct physical components owing to the two-disc components of our galaxy.