论文标题
部分可观测时空混沌系统的无模型预测
Size Distribution of Small Jupiter Trojans in the L5 Swarm
论文作者
论文摘要
我们介绍了使用宽大的Suprime-CAM CCD摄像头在8.2 m Subaru望远镜上使用宽场高级Suprime-CAM CCD摄像头进行的测量观察分析。我们从调查中检测到了189 l5木马，覆盖了大约15摄氏度的天空，检测极限为M_R = 24.1 mag，并选择了一个无偏样的样品，该样品由87个具有绝对幅度的14 <H_r <17的物体组成，对应于直径为2 km <d <10 km的直径，以分析尺寸分布。我们将它们的差分分布拟合到具有指数α= 0.37 +-0.01的单斜率幂律，该分布对应于累积尺寸分布，指数为b = 1.85 +-0.05。将我们的结果与已知的小行星的数据相结合，我们在整个尺寸范围内获得了9 <H_V <17的L5木星特洛伊木马的尺寸分布，发现L4和L5群的尺寸分布彼此吻合很大。这与两群群中的小行星源自同一原始人群的情况是一致的。基于上述结果，在两个群中d> 2 km的小行星总数估计为n_l4/n_l5 = 1.40 +-0.15，估计通过催精量为1.1 x 10^5的L_5木星Trojans总数为1.1 x 10^5。
We present an analysis of survey observations of the trailing L5 Jupiter Trojan swarm using the wide-field Hyper Suprime-Cam CCD camera on the 8.2 m Subaru Telescope. We detected 189 L5 Trojans from our survey that covered about 15 deg^2 of sky with a detection limit of m_r = 24.1 mag, and selected an unbiased sample consisting of 87 objects with absolute magnitude 14 < H_r < 17 corresponding to diameter 2 km < D < 10 km for analysis of size distribution. We fit their differential magnitude distribution to a single-slope power-law with an index α= 0.37 +- 0.01, which corresponds to a cumulative size distribution with an index of b = 1.85 +- 0.05. Combining our results with data for known asteroids, we obtained the size distribution of L5 Jupiter Trojans over the entire size range for 9 < H_V < 17, and found that the size distributions of the L4 and L5 swarms agree well with each other for a wide range of sizes. This is consistent with the scenario that asteroids in the two swarms originated from the same primordial population. Based on the above results, the ratio of the total number of asteroids with D > 2 km in the two swarms is estimated to be N_L4/N_L5=1.40 +- 0.15, and the total number of L_5 Jupiter Trojans with D > 1 km is estimated to be 1.1 x 10^5 by extrapolating the obtained distribution.
