Study of Galactic Structure Using UVIT/AstroSat Star Counts
Abstract
The structure of our Galaxy has been studied from ultraviolet (UV) star counts obtained with the Ultra-Violet Imaging Telescope (UVIT) on board the {\em AstroSat} satellite, in Far-UV (FUV) and Near-UV (NUV) bands. The F154W (BaF2) and N263M (NUVB4) filters were used in the FUV and NUV bands, respectively. The point sources are separated from the extra-galactic sources of UVIT observations using infrared (IR) color cut method. The observed UVIT star counts match well with the simulations obtained from the Besan\c{c}on model of stellar population synthesis towards several Galactic directions. We also estimated the scale length and scale height of the thick disc and the scale height of the thin disc using the space density function and the exponential density law for the stars of intermediate Galactic latitudes. The scale length of the thick disc ranges from 3.11 to 5.40 kpc whereas the scale height ranges from 53032 pc to 63029 pc. The scale height of the thin disc comes out to be in the range of 23020 pc to 33011 pc.
Cite
@article{arxiv.2012.09526,
title = {Study of Galactic Structure Using UVIT/AstroSat Star Counts},
author = {Ranjan Kumar and Ananta C. Pradhan and Devendra K. Ojha and Sonika Piridi and Tapas Baug and S. K. Ghosh},
journal= {arXiv preprint arXiv:2012.09526},
year = {2021}
}
Comments
Accepted for publication in Journal of Astrophysics and Astronomy