https://scholars.lib.ntu.edu.tw/handle/123456789/624932
標題: | The scaling relationship between baryonic mass and stellar disc size in morphologically late-type galaxies | 作者: | Wu P.-F. PO-FENG WU |
關鍵字: | Galaxies: fundamental parameters; Galaxies: spiral; Galaxies: structure | 公開日期: | 2018 | 卷: | 473 | 期: | 4 | 起(迄)頁: | 5468-5475 | 來源出版物: | Monthly Notices of the Royal Astronomical Society | 摘要: | 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* ∝ Mb0.38 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. © 2017 The Author. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85048147453&doi=10.1093%2fmnras%2fstx2745&partnerID=40&md5=6664b2c22a4df61f6ab386ed166bcc1b https://scholars.lib.ntu.edu.tw/handle/123456789/624932 |
ISSN: | 00358711 | DOI: | 10.1093/mnras/stx2745 | SDG/關鍵字: | Stars; Galaxies: fundamental parameters; Galaxies: spirals; Galaxies:structure; Late-type; Mass disk; Mass size; Power-law; Scaling relationships; Stellar disks; Stellar mass; Galaxies |
顯示於: | 天文物理研究所 |
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