论文标题
旋转曲线下降的星系
Galaxies with Declining Rotation Curves
论文作者
论文摘要
研究了从已发布的数据中收集的22个螺旋星系的样本。 Galaxy旋转曲线的最大距离超过$ \ sim 1 $ kpc距中心，随后旋转速度降低。 Tully-Fisher（TF）和Baryonic Tully-Fisher（BTF）图中的星系位置表明，最大旋转速度的值与其他星系相同，而磁盘外围的速度对于某些给定质量或发光量的期望值显着低于期望值。因此，旋转曲线的减小可以与暗光晕对旋转速度的贡献减少有关。对于旋转曲线最长的七个星系，估计磁盘质量与暗光晕（牛顿模型），而没有光晕（修改的牛顿动力学（MOND）模型）。 In four of the galaxies, the MOND model encounters difficulties in interpreting the rotation curve: in order to be consistent with the observations, the MOND parameter $a_0$ should differ significantly from the expected value $a_0 \sim 10^{-8}$ cm/s$^2$, while the disk mass exceeds the value based on IR photometry and maximum disk model.与Mond的冲突对于NGC 157是最重大的。
A sample of 22 spiral galaxies compiled from published data is studied. The galaxy rotation curves pass through a maximum distance of more than $\sim 1$ kpc from the center with a subsequent decrease in the rotation velocity. The galaxy position in the Tully-Fisher (TF) and baryonic Tully-Fisher (BTF) diagrams show that the values of maximum rotation velocities are located on the same sequence with other galaxies, while the velocities at the disk periphery for some galaxies are significantly lower than the expected values for a given mass or luminosity. Thus, the decrease in the rotation curve can be associated with a reduced contribution of the dark halo to the rotation velocity. For seven galaxies with the longest rotation curves, the disk mass was estimated to be with the dark halo (Newtonian model) and without the halo (modified Newtonian dynamics (MOND) model). In four of the galaxies, the MOND model encounters difficulties in interpreting the rotation curve: in order to be consistent with the observations, the MOND parameter $a_0$ should differ significantly from the expected value $a_0 \sim 10^{-8}$ cm/s$^2$, while the disk mass exceeds the value based on IR photometry and maximum disk model. The conflict with MOND is the most significant for NGC 157.
