Best fit Orphan stream model in the presence of the LMC

We give the best fit stream model and orbit for Orphan in the presence of the LMC from the work of Erkal et al. 2019 (https://ui.adsabs.harvard.edu/abs/2019MNRAS.487.2685E). As described in section 4 of that work, this best fit was achieved in a prolate Milky Way halo which responds to the LMC. See the table in the appendix of that work (A1) for the parameters used in the fit. The file containing the orbit (orphan_orbit.txt) gives the position of the Orphan progenitor, LMC, and Milky Way for the past 5 Gyr. The coordinates are Galactocentric in a right-handed system (i..e the Sun is at (-8.1,0,0) kpc and predominantly moving in the positive y direction). The file containing the stream (orphan_stream.txt) gives the position of the Orphan stream particles in Galactocentric coordinates as well as observables (ra,dec,distance,vr,pmra,pmdec) assuming the Sun is at (-8.1,0,0) kpc and moving with a velocity of (11.1,245,7.3) km/s. The stream is generated using the Lagrange point stripping technique as described in the paper. Please cite Erkal et al. 2019 if you make use of this simulation.本数据集基于Erkal等人2019年的研究（https://ui.adsabs.harvard.edu/abs/2019MNRAS.487.2685E），给出了考虑大麦哲伦星系（Large Magellanic Cloud, LMC）影响时，孤儿星流（Orphan）的最优拟合流模型与轨道。如该研究第4节所述，本次最优拟合是在受大麦哲伦星系扰动的扁长银河系（Milky Way）晕中完成的。拟合所用的参数可参见该研究附录A1中的表格。 包含轨道的文件orphan_orbit.txt给出了过去50亿年中，孤儿星流前身天体、大麦哲伦星系与银河系的银心坐标位置。该坐标系为右手坐标系，即太阳位于(-8.1, 0, 0)千秒差距（kpc）处，且主要沿y轴正方向运动。 包含星流的文件orphan_stream.txt则给出了孤儿星流粒子的银心坐标，以及基于太阳位于(-8.1, 0, 0)千秒差距、以(11.1, 245, 7.3)千米每秒（km/s）运动的假设所计算得到的可观测量：赤经（ra）、赤纬（dec）、距离、视向速度（vr）、赤经方向自行（pmra）与赤纬方向自行（pmdec）。本星流采用该研究中所述的拉格朗日点剥离技术生成。若您使用本模拟数据集，请引用Erkal等人2019年的相关工作。