Footprints of the dark matter halo: from pattern speed to disk vertical structure

Arunima Banerjee1*, Narendra Nath Patra1, Jayaram N. Chengalur1, Chanda J. Jog2 and Ayesha Begum3
1National Centre for Radio Astrophysics, Tata Institute of Fundamental Research, Pune 411007, India
2Department of Physics, Indian Institute of Science, Bangalore 560012, India
3Indian Institute of Science Education and Research, Bhopal 462023, India

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Dwarf irregular (dIrr) and low surface brightness (LSB) galaxies constitute the ideal sites for studying the density distribution of the dark matter halo, which strongly regulates the structure and dynamics in these galaxies even in the innermost regions of the stellar disk. In the first part of this paper, we present our detection of a slowly rotating gaseous bar in the dIrr NGC 3741 using the Tremaine-Weinberg method. In the second part, we show that the superthin nature of the stellar disk in the LSB galaxy UGC 7321 can be attributed to the presence of a dense and compact dark matter halo.

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Keywords : galaxies: dwarf - galaxies: irregular - galaxies: individual: NGC 3741 - galaxies: haloes - galaxies: structure - galaxies: individual: UGC 7321