发表机构
Faculty of Physics, Lomonosov Moscow State University; Sternberg Astronomical Institute, Moscow State University（罗蒙诺索夫莫斯科国立大学物理系; 莫斯科国立大学施滕贝格天文学研究所）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究比较低表面亮度星系与正常星系外区的恒星形成率、效率及托姆雷稳定性参数，发现两者依赖关系相似，并指出远距离处盘密度可能被低估。
AI 中文摘要
本文利用多个具有高中性氢含量的星系样本数据，比较了低表面亮度星系（LSB星系）与“正常”表面亮度星系（HSB星系）盘外区在恒星形成率、效率的径向分布以及托姆雷稳定性参数$Q_T$方面的差异。结果表明，LSB星系和HSB星系的恒星形成率$SFR$对$HI$面密度的依赖关系，以及恒星形成效率$SFE$对盘光学亮度$\mu_g$的依赖关系具有相似特征，这表明在低气体密度区域决定恒星形成率的条件具有相似性。所考虑的这些依赖关系一直持续到对应亮度为26-27 mag/arcsec$^2$的距离处，在该处平衡气体层的预期体积密度应非常低。研究提出，在远离中心的距离处，盘密度可能被显著低估。
英文摘要
Low surface brightness galaxies (LSB-galaxies) and the outer regions of disks of "normal" surface brightness galaxies (HSB-galaxies) are compared in terms of the radial distributions of star formation rates and efficiencies, as well as the Toomre stability parameter $Q_T$, using data from several samples of galaxies with high $HI$ content. It is shown that the dependences of the star formation rate $SFR$ on the $HI$ surface density and the star formation efficiency $SFE$ on the disk optical brightness $μ_g$ for LSB- and HSB-galaxies have a similar character, suggesting similarity in the conditions that determine the star formation rate in low gas density regions. The considered dependences persist out to distances corresponding to brightnesses of 26-27 mag/arcsec$^2$, where the expected volume density of the equilibrium gas layer should be very low. It is suggested that the disk density at large distances from the center may be significantly underestimated.
Comments24 pages, 4 figures, 1 table
