论文标题
关于银河系概念的历史观点
A historical perspective on the concept of galaxy size
论文作者
论文摘要
简短的叙述是关于如何接受有效的半径和同在直径，因为出现了星系尺寸量度。有证据表明，这些参数仅基于观察前提来定义，而与任何天体物理理论无关。讨论了一个基于星系中恒星形成所需的预期气体密度阈值的替代性的，具有物理动机的尺寸定义。使用新尺寸尺寸的尺寸巨大质量关系的固有散射为0.06 DEX，比有效半径为尺寸的关系小三倍。在即将进行的深度，广泛的成像调查中，可以采用新的以身体动机的尺寸度量。
A brief narrative on how the effective radius and isophotal diameters were accepted as galaxy size measures is presented. Evidence suggests that these parameters were defined only based on observational premises, independent of any astrophysical theories. An alternative, new physically motivated size definition based on the expected gas density threshold required for star formation in galaxies is discussed. The intrinsic scatter of the size-stellar mass relation using the new size measure is 0.06 dex, three times smaller than that of the relation with the effective radius as size. The new physically motivated size measure can be adopted in upcoming deep, wide imaging surveys.
