论文标题
M92的隐藏过去：使用加拿大法语成像调查的新形成的17°长恒星流的检测和表征
The hidden past of M92: Detection and characterization of a newly formed 17° long stellar stream using the Canada-France Imaging Survey
论文作者
论文摘要
我们对新发现的恒星流的结构，运动学和轨道进行了分析（NGC 6341）。该流是在改进的外部星系匹配的滤波器图中发现的，它是基于“颜色刻度级”图，该图是使用来自加拿大弗朗西·弗朗西（Canada-France）成像调查（CFIS）的光度法和Pan-Starrs 1 3 $π$调查（PS1）创建的。 We find the stream to have a length of 17° (2.5 kpc at the distance of M92), a width dispersion of $0.29$°(42 pc) and a stellar mass of $[3.17 \pm{0.89}] \times 10^{4} $ M$_\odot$ ($10 \%$ of the stellar mass of the current main body of M92).我们检查了属于该流的主要序列，红色巨型和蓝色水平分支星星的运动学，并从GAIA的第二个数据释放中具有适当的运动测量值。 N体模拟表明，该流很可能是最近形成的（在最后的$ \ sim 500 $ MYR中）迫使我们质疑这个古老的，贫穷的球形集群的轨道起源。
We present an analysis of the structure, kinematics and orbit of a newly found stellar stream emanating from the globular cluster M92 (NGC 6341). This stream was discovered in an improved matched-filter map of the outer Galaxy, based on a "color-color-magnitude" diagram, created using photometry from the Canada-France Imaging Survey (CFIS) and the Pan-STARRS 1 3$π$ survey (PS1). We find the stream to have a length of 17° (2.5 kpc at the distance of M92), a width dispersion of $0.29$°(42 pc) and a stellar mass of $[3.17 \pm{0.89}] \times 10^{4} $ M$_\odot$ ($10 \%$ of the stellar mass of the current main body of M92). We examine the kinematics of main sequence, red giant and blue horizontal branch stars belonging to the stream and that have proper motion measurements from the second data release of Gaia. N-body simulations suggest that the stream was likely formed very recently (during the last $\sim 500$ Myr) forcing us to question the orbital origin of this ancient, metal-poor globular cluster.
