The central region of the enigmatic Malin 1
Abstract
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/UVIT observations suggest scattered recent star formation activity all over the disk, especially along the spiral arms. The central 9'' (∼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 reveals far-UV emission within the bar region (∼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 Hα , [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.
- Publication:
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Journal of Astrophysics and Astronomy
- Pub Date:
- October 2021
- DOI:
- 10.1007/s12036-021-09715-5
- arXiv:
- arXiv:2101.07002
- Bibcode:
- 2021JApA...42...59S
- Keywords:
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- Galaxies: structure;
- galaxies: evolution;
- galaxies: interaction;
- Astrophysics - Astrophysics of Galaxies
- E-Print:
- 15 pages, 10 figures, accepted for publication in the Journal of Astrophysics and Astronomy