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arXiv 1807.09235astro-ph.GA
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光谱光纤碰撞对观测角关联函数的影响

The Impact of Spectroscopic Fibre Collisions on the Observed Angular Correlation Function

Yjan A. Gordon, Kevin A. Pimbblet, Matt S. Owers

摘要:

一些光谱星系巡天的设计是这样的,纤维碰撞可能影响巡天的完整性。为了量化这种影响,我们比较了两点关联函数,$ω(θ)$,两个调查不同的观察策略。纤维碰撞是斯隆数字巡天光谱活动(SDSS)设计的公认结果,而星系和质量大会巡天(GAMA)通过使用不同的纤维配置重新观察场来避免纤维碰撞。我们发现,这些调查的关联函数发散尺度小于SDSS纤维碰撞限制,并在分离小于$20''$ $ω(θ)_{\text{GAMA}} > ω(θ)_{\text{SDSS}}$与$>4σ$的信心。

英文摘要:

The design of some spectroscopic galaxy surveys is such that fibre collisions can affect the completeness of the survey. To quantify this effect, we compare the two-point correlation functions, $ω(θ)$, of two surveys with differing observational strategies. Fibre collisions are an accepted consequence of the design of the Sloan Digital Sky Survey's spectroscopic campaign (SDSS), whereas the Galaxy And Mass Assembly survey (GAMA) circumvents fibre-collisions by re-observing fields using different fibre configurations. We show that the correlation functions of these surveys diverge at scales smaller than the SDSS fibre collision limit, and that at separations smaller than $20''$ $ω(θ)_{\text{GAMA}} > ω(θ)_{\text{SDSS}}$ with $>4σ$ confidence.

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