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2020天文年會
中研院天文所 國際會議廳

論文摘要

Dark matter distributions in the central regions of nearby spiral galaxies

[ Poster ]

Cheng-Lin Liao (Department of Physics, National Central University); Chorng-Yuan Hwang (Graduate Institute of Astronomy, National Central University)

The Flat Rotation Curve Problem of spiral galaxies has remained a mystery in astronomy for more than sixty years. The existing of invisible mass, the so-called dark matter, is an explanation of this problem. According to the predictions of different dark matter candidates, the dark matter density profiles in the central region would vary differently. Another explanation of the Flat Rotation Curve Problem is Modified Newtonian Dynamics (MOND), which suggests that the missing mass problem only occurs in small acceleration regimes. We had investigated the central dark matter distributions in nearby spiral galaxy by using observational data from ALMA and WISE. Our results are that the central dark matter density in our nearby galaxy targets are “cuspy”, which poses a challenge to the conventional MOND theories and gives restrictions to possible dark matter candidates.