• KANAK SAHA

      Articles written in Journal of Astrophysics and Astronomy

    • The central region of the enigmatic Malin 1

      KANAK SAHA SURAJ DHIWAR SUDHANSHU BARWAY CHAITRA NARAYAN SHYAM TANDON

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      Malin 1, being a class of giant low surface galaxies, continues to surprise us even today. The HST/F814W observation has shown that the central region of Malin 1 is more like a normal SB0/a galaxy, while the rest of the disk has the characteristic of a low surface brightness system. The AstroSat/UVITobservations suggest scattered recent star formation activity all over the disk, especially along the spiral arms. The central 900 ($\sim$14 kpc) region, similar to the size of the Milky Way’s stellar disk, has a number of far-UV clumps—indicating recent star-formation activity. The high resolution UVIT/F154W image revealsfar-UV emission within the bar region ($\sim$4 kpc)—suggesting the presence of hot, young stars in the bar. These young stars from the bar region are perhaps responsible for producing the strong emission lines such as Ha, [Oii] seen in the SDSS spectra. Malin 1B, a dwarf early-type galaxy, is interacting with the central region and probably responsible for inducing the recent star-formation activity in this galaxy.

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