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 \(9''\) (\(\sim 14\,\hbox {kpc}\)) 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 (\(\sim 4\,\hbox {kpc}\))—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 H\(\alpha \), [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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Acknowledgements
The AstroSat/UVIT observation of Malin 1 and the preliminary data analysis was done as part of the collaborative program under bilateral grant DST/INT/South Africa/P-03/2016 of the Indo-South Africa Flagship Program in Astronomy. A good part of this work was initiated during the visit of KS to South African Astronomical Observatory, Cape Town. KS and SB acknowledge the generous financial support under the same. The UVIT project is a collaboration between IIA, IUCAA, TIFR, ISRO from India and CSA from Canada. This publication uses the UVIT data obtained from Indian Space Science Data Centre (ISSDC)of ISRO, where the data for AstroSat mission is archived. We thank the anonymous referee for an insightful comments which improved the quality of the paper. We thank T. Pickering for kindly making the HI data available to us. SD gratefully acknowledges the support from Department of Science and Technology (DST), New Delhi under the INSPIRE faculty Scheme (sanctioned No: DST/INSPIRE/04/2015/000108).
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This article is part of the Special Issue on “AstroSat: Five Years in Orbit”.
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Saha, K., Dhiwar, S., Barway, S. et al. The central region of the enigmatic Malin 1. J Astrophys Astron 42, 59 (2021). https://doi.org/10.1007/s12036-021-09715-5
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DOI: https://doi.org/10.1007/s12036-021-09715-5