论文标题
通过光盘不稳定性凸出形成 - 我
Bulge formation through disc instability -- I
论文作者
论文摘要
我们使用模拟研究嵌入静态球形光环中的分离的薄指数恒星盘中假骨的生长。我们观察到从较晚的形态类型到早期的形态类型的过渡，并且对于较高的盘式与盘的质量比，较低的椎间盘与途径的比率以及较低的光环浓度的凸出率更大。我们通过安装两个组件的表面密度分布来计算膨胀与总数恒星质量比$ b/t $。最终的$ b/t $与光盘的分数贡献$ f _ {\ rm d} $对光radius处的总重力加速度有很高的关系。 The formula $B/T=0.5\,f_{\rm }^{1.8}$ fits the simulations to an accuracy of $30\%$, is consistent with observational measurements of B/T and f_d as a function of luminosity, and reproduces the observed relation between $B/T$ and stellar mass when incorporated into the GalICS~2.0 semi-analytic model of galaxy形成。
We use simulations to study the growth of a pseudobulge in an isolated thin exponential stellar disc embedded in a static spherical halo. We observe a transition from later to earlier morphological types and an increase in bar prominence for higher disc-to-halo mass ratios, for lower disc-to-halo size ratios, and for lower halo concentrations. We compute bulge-to-total stellar mass ratios $B/T$ by fitting a two-component Sérsic-exponential surface-density distribution. The final $B/T$ is strongly related to the disc's fractional contribution $f_{\rm d}$ to the total gravitational acceleration at the optical radius. The formula $B/T=0.5\,f_{\rm }^{1.8}$ fits the simulations to an accuracy of $30\%$, is consistent with observational measurements of B/T and f_d as a function of luminosity, and reproduces the observed relation between $B/T$ and stellar mass when incorporated into the GalICS~2.0 semi-analytic model of galaxy formation.
