We present a study of the kinematics of the outer regions of the early-type galaxy NGC 1316, based on radial velocity measurements of 43 planetary nebulae as well as deep integrated-light absorption line spectra. The smoothed velocity field of NGC 1316 indicates fast rotation at a distance of 16 kpc, possibly associated with an elongated feature orthogonal to the inner dust lanes. The mean square stellar velocity is approximately independent of radius, and the estimated total mass of the system is 2.6 x 10^11 M_sun within a radius of 16 kpc, implying an integrated mass-to-light ratio of M/L_B = 8.
展开▼
机译：我们基于43个行星状星云的径向速度测量结果以及深积分光吸收谱线，对早期类型星系NGC 1316的外部区域进行了运动学研究。 NGC 1316的平滑速度场指示以16 kpc的距离快速旋转，可能与正交于内部灰尘通道的细长特征相关。恒星的平均平方速度大约与半径无关，在16 kpc的半径内，系统的估计总质量为2.6 x 10 ^ 11 M_sun，这意味着M / L_B = 8的积分质量比。
展开▼
