斯巴鲁档案搜索微弱的TNO
A Subaru Archival Search for Faint TNOs
摘要：
我们提出了一个调查的结果trans-neptunian对象（TNOs）的基础上斯巴鲁档案图像，最初收集的谢泼德等人。（2005年）作为一个不规则的天王星卫星搜索的一部分。测量区域覆盖2.8 deg^2，以天王星为中心，并在相邻的两个夜晚在冲日附近进行观测。在R=25.69 $\pm$ 0.01时，我们的调查达到其最大检测效率的一半。探测到的物体对应于82个TNO，5个半人马座和5个不规则卫星。我们的模型TNO的累积数量比一个给定的视星等与单倍和双幂律。最佳拟合的单次幂律，即每平方度有一个天体的星等为$R_0 =22.6_{-0.4}^{+0.3}$，斜率为$α= 0.51_{-0.6}^{+0.5}$，与极限星等较浅的类似搜索结果不一致。最佳拟合的双幂律，具有亮端斜率$α_1 = 0.7_{-0.1}^{+0.2}$，暗端斜率$α_2=0.3_{-0.2}^{+0.2}$，R=23处的微分数密度，$σ_{23} = 2.0_{-0.5}^{+0.5}$和$R_{eq} = 24.3_{-0.1}^{+0.8}$处的斜率中的幅度突变，比单幂律更可能，贝叶斯因子约为26。这是第一次有足够的深度和面积来确定断裂发生的程度，而不依赖于其他调查的结果。...
英文摘要：
We present the results of a survey for trans-neptunian objects (TNOs) based on Subaru archival images, originally collected by Sheppard et al. (2005) as part of a search for irregular satellites of Uranus. The survey region covers 2.8 deg^2, centered on Uranus and observed near opposition on two adjacent nights. Our survey reaches half its maximum detection efficiency at R=25.69$\pm$0.01. The objects detected correspond to 82 TNOs, five Centaurs, and five irregular satellites. We model the cumulative number of TNOs brighter than a given apparent magnitude with both a single and double power law. The best fit single power law, with one object per square degree at magnitude $R_0 =22.6_{-0.4}^{+0.3}$ and a slope of $α= 0.51_{-0.6}^{+0.5}$, is inconsistent with the results of similar searches with shallower limiting magnitudes. The best fit double power law, with a bright-end slope $α_1 = 0.7_{-0.1}^{+0.2}$, a faint-end slope $α_2=0.3_{-0.2}^{+0.2}$, a differential number density at R=23, $σ_{23} = 2.0_{-0.5}^{+0.5}$ and a magnitude break in the slope at $R_{eq} = 24.3_{-0.1}^{+0.8}$, is more likely than the single power law by a Bayes factor of ~26. This is the first survey with sufficient depth and areal coverage to identify the magnitude at which the break occurs without relying on the results of other surveys. ...
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