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      https://www.ias.ac.in/article/fulltext/joaa/042/0042

    • Keywords

       

      Stars: distances; ultraviolet: stars; galaxy; disc.

    • 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 AstroSat satellite, in Far-UV (FUV) and Near-UV (NUV) bands. The F154W (BaF$_2$) 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 Besanc¸on model of stellar population synthesis towards several Galactic directions. We alsoestimated 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 $530 \pm 32$ pc to $630 \pm 29$ pc. The scale height of the thin disc comes out to be in the range of $230 \pm 20$ pc to $330 \pm 11$ pc.

    • Author Affiliations

       

      RANJAN KUMAR1 ANANTA C. PRADHAN1 DEVENDRA K. OJHA2 SONIKA PIRIDI1 TAPAS BAUG3 S. K. GHOSH2

      1. Department of Physics and Astronomy, National Institute of Technology, Rourkela 769 008, India.
      2. Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005, India.
      3. Kavli Institute for Astronomy and Astrophysics, Peking University, 5 Yiheyuan Road, Haidian District, Beijing 100871, China.
    • Dates

       
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