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Can bars Erode cuspy halos?

Kataria, SK and Das, M and McGaugh, S (2019) Can bars Erode cuspy halos? In: Proceedings of the International Astronomical Union, 14 (S353). pp. 184-185.

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Official URL: https://doi.org/10.1017/S1743921319008743


One of the major and widely known small scale problem with the Lambda CDM model of cosmology is the core-cusp problem. In this study we investigate whether this problem can be resolved using bar instabilities. We see that all the initial bars are thin (b/a < 0.3) in our simulations and the bar becomes thick (b/a > 0.3) faster in the high resolution simulations. By increasing the resolution, we mean a larger number of disk particles. The thicker bars in the high resolution simulations transfer less angular momentum to the halo. Hence, we find that in the high resolution simulations it takes around 7 Gyr for the bar to remove inner dark matter cusp which is too long to be meaningful in galaxy evolution timescales. Physically, the reason is that as the resolution increases, the bar buckles faster and becomes thicker much earlier on. © 2020 International Astronomical Union.

Item Type: Journal Article
Publication: Proceedings of the International Astronomical Union
Publisher: Cambridge University Press
Additional Information: This article belongs to Cambridge University Press
Keywords: (cosmology:) dark matter; methods: n-body simulations; methods: numerical
Department/Centre: Division of Physical & Mathematical Sciences > Astronomy and Astrophysics Programme
Date Deposited: 22 Sep 2021 10:00
Last Modified: 25 Sep 2021 12:25
URI: http://eprints.iisc.ac.in/id/eprint/65672

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