The dark matter distribution of NGC 5921

Ali, Israa Abdulqasim Mohammed and Hashim, Norsiah and Abidin, Zamri Zainal (2018) The dark matter distribution of NGC 5921. Indian Journal of Physics, 92 (4). pp. 409-415. ISSN 0973-1458, DOI

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We used the neutral atomic hydrogen data of the Very Large Array for the spiral galaxy NGC 5921 with z = 0.0045 at the distance of 22.4 Mpc, to investigate the nature of dark matter. The investigation was based on two theories, namely, dark matter and Modified Newtonian Dynamics (MOND). We presented the kinematic analysis of the rotation curve with two models of dark matter, namely, the Burkert and NFW profiles. The results revealed that the NFW halo model can reproduce the observed rotation curve, with χred2≈1, while the Burkert model is unable to fit the observation data. Therefore, the dark matter density profile of NGC 5921 can be presented as a cuspy halo. We also tried to investigate the observed rotation curve of NGC 5921 with MOND, along with the possible assumption on baryonic matter and distance. We note that MOND is still incapable of mimicking the rotation curve with the observed data of the galaxy.

Item Type: Article
Funders: National Aeronautics and Space Administration, National Science Foundation, University of Malaya’s HIR Grant UM.S/625/3/HIR/24
Uncontrolled Keywords: Cosmology; Dark matter; Galaxy
Subjects: Q Science > Q Science (General)
Q Science > QA Mathematics
Q Science > QC Physics
Divisions: Centre for Foundation Studies in Science > Mathematics Division
Faculty of Science > Department of Physics
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 25 Sep 2019 07:44
Last Modified: 25 Sep 2019 07:44

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