Browsing by Author "Ianjamasimanana, Roger"

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Estimating the Oblateness of Dark Matter Halos Using Neutral Hydrogen Velocity Dispersion

Mousumi Das; Ianjamasimanana, Roger; McGaugh, Stacy S; Schombert, James; Dwarakanath, K. S (American Astronomical Society, 2023-03-20)

We derive the oblateness parameter q of the dark matter halo of a sample of gas-rich, face-on disk galaxies. We have assumed that the halos are triaxial in shape but their axes in the disk plane (a and b) are equal, so ...
Tracing the Dynamical Mass in Galaxy Disks Using H i Velocity Dispersion and Its Implications for the Dark Matter Distribution in Galaxies

Mousumi Das; McGaugh, S. S; Ianjamasimanana, Roger; Schombert, James; Dwarakanath, K. S (IOP Publishing, 2020-01-20)

We present a method to derive the dynamical mass of face-on galaxy disks using their neutral hydrogen (H i) velocity dispersion (σ H i ). We have applied the method to nearby, gas-rich galaxies that have extended H i gas ...

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