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学術論文

The scaling relationship between baryonic mass and stellar disc size in morphologically late-type galaxies

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Wu,  Po-Feng
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

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引用

Wu, P.-F. (2018). The scaling relationship between baryonic mass and stellar disc size in morphologically late-type galaxies. Monthly Notices of the Royal Astronomical Society, 473, 5468-5475.


引用: https://hdl.handle.net/21.11116/0000-0005-CA3C-5
要旨
Here I report the scaling relationship between the baryonic mass and scale-length of stellar discs for ∼1000 morphologically late-type galaxies. The baryonic mass-size relationship is a single power law R_\ast ∝ M_b^{0.38} across ∼3 orders of magnitude in baryonic mass. The scatter in size at fixed baryonic mass is nearly constant and there are no outliers. The baryonic mass-size relationship provides a more fundamental description of the structure of the disc than the stellar mass-size relationship. The slope and the scatter of the stellar mass- size relationship can be understood in the context of the baryonic mass- size relationship. For gas-rich galaxies, the stars are no longer a good tracer for the baryons. High-baryonic-mass, gas-rich galaxies appear to be much larger at fixed stellar mass because most of the baryonic content is gas. The stellar mass-size relationship thus deviates from the power-law baryonic relationship, and the scatter increases at the low-stellar-mass end. These extremely gas-rich low-mass galaxies can be classified as ultra-diffuse galaxies based on the structure.