35th Annual Report (2022-2023) - ENGLISH

23 a research paper on July 20, 2022, by the main journal of Nature [DOI: https://doi.org/10.1038/s41586-022- 04905-9]. Prof. Kanak Saha says “We are witnessing the 'live' formation of these far- way dwarf galaxies! UVIT's resolving power and deep field imaging techniques have been the key to spotting some very young, large star-forming clumps. These form on the periphery and then spiral into the visible (optical) boundary of their galaxy within a billion years timescale thus adding to the growth of the galaxy. A good part of our research work consists of meticulously calculating the time required for the clumps to migrate inside the galaxy”. He also emphasized that the key challenge has been to firmly establish the detection of these faint, extremely blue, star-forming clumps which are very far away to see although they have a million solar masses of material within them. At slightly larger distances, the UVIT would not resolve these galaxies and we do not have an example of an extended disk seen in UV in any present-day dwarf galaxies. The redshift (cosmological distance) of these 12 dwarfs has been just optimal to probe these blue clumpy structures in their outskirts.