论文标题
测试具有凸起的星系中棒形成的理论预测
Testing a theoretical prediction for bar formation in galaxies with bulges
论文作者
论文摘要
较早的研究表明，巨大的凸起阻碍了磁盘星系中的棒形成。最近的N体模拟得出了一个棒形成标准，该标准取决于星系盘中的径向凸起力。我们使用这些模拟表明只有在力常数fb <0.13时才能形成条形，其中Fb取决于凸起力与星系的总力的比例，其磁盘尺度长度为2R d两倍。在本文中，我们使用从文献获得的观察数据来测试这一理论预测。我们的样本由63个禁止的星系组成，这些星系与S 4 G目录中的各种哈勃类别组成，已完成凸起，磁盘和钢筋分解。我们发现，92％的样品星系满足了星系中条形的条件Fb <0.13，因此与模拟给出的条形形成标准一致。
Earlier studies have shown that massive bulges impede bar formation in disk galaxies. Recent N-body simulations have derived a bar formation criterion that depends on the radial bulge force in a galaxy disk. We use those simulations to show that bars can form only when the force constant FB < 0.13, where FB depends on the ratio of the bulge force to the total force of the galaxy at twice the disk scale length 2R d . In this article, we test this theoretical prediction using observational data obtained from the literature. Our sample consists of 63 barred galaxies with a wide range of Hubble classes from the S 4 G catalogue for which bulge, disk and bar decomposition has been done. We find that 92 % of our sample galaxies satisfy the condition FB < 0.13 for bar formation in galaxies and hence agree with the bar formation criterion given by the simulations.
