论文标题
ophiuchus流的更大程度
A Larger Extent for the Ophiuchus Stream
论文作者
论文摘要
我们为Ophiuchus Stellar流提供了新的运动学数据。使用了MMT望远镜的会员候选者使用少量，Hectospec，Hectochelle和Binospec，这些光谱已提供了1800多个新速度。结合GAIA -DR2目录对恒星在现场的适当运动测量结合，我们得出了流成员资格概率，从而发现了200多个可能的成员。这些数据显示，流扩展到发现数据中显示的长度的三倍以上。还检测到主流的刺激。高分辨率光谱使我们能够解决恒星速度分散体，发现为$ 1.6 \ pm 0.3 $ km/sec。
We present new kinematic data for the Ophiuchus stellar stream. Spectra have been taken of member candidates at the MMT telescope using Hectospec, Hectochelle and Binospec, which provide more than 1800 new velocities. Combined with proper motion measurements of stars in the field by the Gaia - DR2 catalog, we have derived stream membership probabilities, resulting in the detection of more than 200 likely members. These data show the stream extends to more than three times the length shown in the discovery data. A spur to the main stream is also detected. The high resolution spectra allow us to resolve the stellar velocity dispersion, found to be $1.6 \pm 0.3 $ km/sec.
