THE RELATION BETWEEN STELLAR AND DYNAMICAL SURFACE DENSITIES IN THE CENTRAL REGIONS OF DISK GALAXIES
THE RELATION BETWEEN STELLAR AND DYNAMICAL SURFACE DENSITIES IN THE CENTRAL REGIONS OF DISK GALAXIES
复制标题
盘状星系中心区域恒星表面密度与动态表面密度的关系
DOI：
10.3847/2041-8205/827/1/l19
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
M. Pawlowski
中科院分区：
文献类型：
--
作者：
F. Lelli;S. McGaugh;J. Schombert;M. Pawlowski
利用Spitzer Photometry and Accurate Rotation Curves （SPARC）数据库研究了135个盘状星系（S0 ~ dIrr）中恒星中心表面密度Σ -百科(0)与动态质量Σ dyn(0)之间的关系。我们发现Σ dyn(0)与Σ百科(0)紧密相关，超过4个索引。这种中心密度关系可以用双幂律来描述。高表面亮度的星系符合1:1的关系，表明它们是自引力的，内部重子占主导地位。低表面亮度（LSB）星系系统地偏离1:1线，表明暗物质的贡献逐渐增加，但仍然与恒星紧密耦合。观测到的散射很小（约0.2指数），主要由观测不确定性驱动。残差显示与其他星系属性如恒星质量、大小或气体含量没有相关性。
We use the Spitzer Photometry and Accurate Rotation Curves (SPARC) database to study the relation between the central surface density of stars Σ ⋆ ( 0 ) and dynamical mass Σ dyn ( 0 ) in 135 disk galaxies (S0 to dIrr). We find that Σ dyn ( 0 ) correlates tightly with Σ ⋆ ( 0 ) over 4 dex. This central density relation can be described by a double power law. High surface brightness galaxies are consistent with a 1:1 relation, suggesting that they are self-gravitating and baryon dominated in the inner parts. Low surface brightness (LSB) galaxies systematically deviate from the 1:1 line, indicating that the dark matter contribution progressively increases but remains tightly coupled to the stellar one. The observed scatter is small (∼0.2 dex) and largely driven by observational uncertainties. The residuals show no correlations with other galaxy properties like stellar mass, size, or gas fraction.