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2020天文年會
中研院天文所 國際會議廳

論文摘要

probing dark matter distributions of dwarf disk galaxies using SDSS MaNGA and 2MASS

[ Poster ]

Weijing Wu (Graduate Institute of Astronomy, National Central University, Zhongli District, Taoyuan, Taiwan); Chorng-Yuan Hwang (Graduate Institute of Astronomy, National Central University, Zhongli District, Taoyuan, Taiwan)

Galaxies are known to contain dark matter. In particular, the highest dark matter to baryons ratio is found in dwarf galaxies. In this study, we investigate the dark matter distributions of dwarf galaxies using integral field spectroscopy from SDSS MaNGA. Our targets are dwarf disk galaxies with stellar mass smaller than or equal to 10e9 solar mass. We first obtained 2D maps of stellar velocity and velocity dispersion, and the velocity of ionized hydrogen. We then determined the rotation velocity of the galaxies through its relation with the line-of-sight velocity. Combining the velocity dispersions, we can estimate the dynamical mass of the galaxies. To obtain the dark matter distributions in the galaxies, we also estimate the stellar mass distribution using the K-band data from 2MASS. Preliminary results of dark matter distributions of several disk galaxies are shown.