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arXiv 1805.09445astro-ph.EP
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Hilda小行星的尺寸分布

Size Distribution of Small Hilda Asteroids

Tsuyoshi Terai, Fumi Yoshida

摘要:

我们提出了希尔达小行星群的大小分布使用光学测量数据获得的8.2米斯巴鲁望远镜与超Suprime-Cam。我们的无偏样本由91颗直径1~km的Hilda小行星组成。我们发现,在~1-10 km的直径范围内,Hildas的尺度分布可以近似为单斜率幂律,在微分绝对星等分布中,最佳拟合的幂律斜率为α = 0.38 +/- 0.02。直接比较希尔达斯的大小分布与从同一数据集Yoshida & Terai(2017)测量的木星特洛伊的大小分布表明,这两个大小分布在直径约10公里的范围内非常相似,而这些形状与主带小行星的形状不同。结果表明,希尔达斯和木星特洛伊有着共同的起源,并且与主带小行星的形成环境不同。直径大于2公里的希尔达星群的总数量估计约为1 x 10^4,比木星特洛伊星群少5倍左右。

英文摘要:

We present the size distribution for Hilda asteroid group using optical survey data obtained by the 8.2 m Subaru Telescope with the Hyper Suprime-Cam. Our unbiased sample consists of 91 Hilda asteroids (Hildas) down to 1~km in diameter. We found that the Hildas' size distribution can be approximated by a single-slope power law in the ~1-10 km diameter range with the best-fit power-law slope of alpha = 0.38 +/- 0.02 in the differential absolute magnitude distribution. Direct comparing the size distribution of Hildas with that of the Jupiter Trojans measured from the same dataset Yoshida & Terai (2017) indicates that the two size distributions are well similar to each other within a diameter of ~10 km, while these shapes are distinguishable from that of main-belt asteroids. The results suggest that Hildas and Jupiter Trojans share a common origin and have a different formation environment from main-belt asteroids. The total number of the Hilda population larger than 2 km in diameter is estimated to be ~1 x 10^4 based on the size distribution, which is less than that of the Jupiter Trojan population by a factor of about five.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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