Difference between Dynamical Masses and Stellar Masses of the Bulge in Spiral Galaxies

Volume 18 No 1 (2020)

Ismaeel A. Al-Baidhany, Sami Salman Chiad, Wasmaa A. Jabbar, Nadir Fadhil Habubi, Khalid Haneen Abass

DOI: 10.14704/nq.2020.18.1.NQ20110

Abstract

This work aims to study the difference between bulge dynamical masses and bulge stellar masses for Spitzer/IRAC 3.6 μm images of 41spiral galaxies. The ratio between the stellar and dynamical masses for the spiral galaxies were studied using the virial relation and mass to light ratio (M*/Lbulge) to find M⋆and Mdyn masses respectively. We found the dynamical mass was found applying the virial relation with the virial coefficient (K = 5). We obtained a stellar velocity dispersion from the literature .We obtained the bulge effective radius (re) using 2Ddecompostion of Spitzer/IRAC at 3.6 μm images. The stellar mass M⋆ of each galaxy measured using the bulge luminosity and (M*/Lbulge) ratio.

Keywords

Dynamical Mass, Stellar Mass, Bulge Luminosity, Mass to Light Ratio.

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