Research

Dark Matter Halos

Fig: Galaxies consists of Dark Matter halos, baryonic disks and stellar bulge and/or stellar bars.

Fig: Stars in the central region of galaxies from triaxial structures that look like a bar.

Fig: Stars in Dwarf galaxies / Globular clusters get tidally stripped in the gravitational potential of more massive galaxies (Source: Jon Lomberg).

Fig: Different types of simple Dark Matter Halo Shapes using N-Body Simulations.

I have worked with FIRE-2 simulations and the TNG50 simulations. Currently I am working with the Auriga and Superstars simulations.

Spiral Structure Properties, Dynamics, and Evolution in MW-mass Galaxy Simulations, Quinn, J. R. ; Loebman, S. R. ; Daniel, K. J. ; Beraldo e Silva, L. ; Wetzel, A. ; Debattista, V. P. ; Arora, A. ; Ansar, S. ; McCluskey, F. ; Masoumi, D. ; Bailin, J., arxiv: 2507.22793 (2025)
The stellar bar – dark matter halo connection in the TNG50 simulations, S Ansar and M Das, arxiv: 2311.11998 (2024)
Dark Matter Halo Spin of the Dwarf Galaxy UGC 5288: Insights from Observations, N-body and Cosmological Simulations, S Ansar, SK Kataria, M Das, arxiv:2307.09952 (2023)
Bar formation and destruction in the FIRE-2 simulations, S Ansar, S Pearson, RE Sanderson, A Arora, P F Hopkins, A Wetzel, E C Cunningham and J Quinn, arxiv:2309.16811 (2024)
Modelling dark matter halo spin using observations and simulations: application to UGC 5288, S Ansar, SK Kataria, M Das, MNRS 522 (2), 2967-2994 (2023), arxiv:2304.00724
Determining Dark Matter Halo Properties using Visible Matter Observations of galaxies: A novel technique applied to high spinning halo of UGC5288, S Ansar, SK Kataria, M Das, AAS/DDAM 53 (5). 105.02
Impact of inhomogeneous CMB heating of gas on the HI 21-cm signal during dark ages, S Ansar, KK Datta, DD Chowdhury, PRD 98 (10), 103505 (2018), arxiv:1810.05908

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