Planetary nebulae of NGC 4494

We present new Planetary Nebula Spectrograph observations of the ordinary elliptical galaxy NGC 4494, resulting in positions and velocities of 255 planetary nebulae out to seven...本研究针对普通椭圆星系NGC 4494开展了全新的行星状星云摄谱仪（Planetary Nebula Spectrograph）观测，最终获取了255颗行星状星云的位置与速度数据，观测覆盖范围延展至七（原文后续内容存在截断）。