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      Permanent link:
      https://www.ias.ac.in/article/fulltext/joaa/042/0050

    • Keywords

       

      Galaxies: dwarf irregular; galaxies: individual; galaxies: star formation; ultra-violet.

    • Abstract

       

      We present an ultra-violet study of two nearby dwarf irregular galaxies WLM and IC 2574, using the Far-UV and Near-UV data from the Ultra-Violet Imaging Telescope (UVIT). We used the F148W band Far-UV images and identified 180 and 782 young star-forming clumps in WLM and IC 2574, respectively. The identified clumps have sizes between 7–30 pc in WLM and 26–150 pc in IC 2574. We noticed more prominent hierarchical splitting in the structure of star-forming regions at different flux levels in IC 2574 than WLM. We found that the majority of the clumps have elongated shapes in the sky plane with ellipticity ($\varepsilon$) greater than 0.6 in both the galaxies. The major axis of the identified clumps is found to show no specific trend of orientation in IC 2574, whereas in WLM the majority are aligned along south-west to north-east direction. We estimated (F148W–N242W) colour for the clumps identified in WLM and noticed that theyounger ones (with (F148W–N242W) < $-$ 0:5) are smaller in size (<10 pc) and are located mostly in the southern half of the galaxy between galactocentric radii 0.4–0.8 kpc.

    • Author Affiliations

       

      CHAYAN MONDAL1 2 ANNAPURNI SUBRAMANIAM1 KOSHY GEORGE3

      1. Indian Institute of Astrophysics, 2nd Block, Koramangala, Bangalore 560 034, India.
      2. Pondicherry University, R.V. Nagar, Kalapet, Puducherry 605 014, India.
      3. Faculty of Physics, Ludwig-Maximilians-Universita¨t, Scheinerstr. 1, 81679 Munich, Germany.

    • Dates

       
      Published
      18 June 2021
      Manuscript received
      7 November 2020
      Accepted
      15 April 2021
      Final version published online
      18 June 2021

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