银河系中恒星体积和表面形成规律的径向变化
Radial Variations of the Volume- and Surface-Star Formation Laws in the Galaxy
摘要：
利用银河系中HII区、HI和分子气体的三维分布，研究了体积和表面Schmidt定律（恒星形成或SF定律）随银河系中心距离R的变化。幂律指数和SF系数均随R的变化而变化。内盘的指数比外盘平坦，内盘的系数较大，向外急剧减小。该指数与SF系数之间也存在相互反相关关系，SF规律可用SF系数的单参数函数表示。变SF定律与自调节恒星形成有关。
英文摘要：
Variation of the volume- and surface-Schmidt laws (star-formation or SF law) with the galacto-centric distance R was investigated using 3D distributions of HII regions, HI, and molecular (H_2) gases in the Milky Way. Both the power-law index and SF coefficient were found to be variable with R. The index is flatter in the inner disc than in the outer Galaxy, and the coefficient is larger in the inner disc, decreasing steeply outward. There is also a mutual anti-correlation between the index and SF coefficient, and the SF law can be expressed by a single-parameter function of the SF coefficient. The variable SF law is discussed in relation to the self-regulation star formation.
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