Description
This study examines 27 galaxies from the Bluedisk survey, comprising high-HI gas content galaxies and control galaxies matched for stellar mass, stellar mass surface density, redshift, and inclination angle. Using HI gas as a tracer of dark matter, our focus is to understand the dark matter properties in HI-rich galaxies and compare them with normal spiral and dwarf galaxies. By analyzing stellar surface brightness profiles and rotation curves, we constructed mass models to study the dark matter distribution. We used the Navarro, Frenk, and White (NFW) and pseudo-isothermal (ISO) models, to evaluate the dark matter content and velocity fractions in the galaxies. Our findings reveal varying model fits, with some galaxies favoring the ISO model,
indicating a central density core, and others align with the NFW model, exhibiting a cuspy density distribution, while some galaxies fit both models. This comparative analysis sheds light on the relationship between dark matter dynamics and HI gas content, enhancing our understanding of galaxy evolution.
| Stream | Science |
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