论文标题
银河中心的伪点源信号
Spurious Point Source Signals in the Galactic Center Excess
论文作者
论文摘要
我们重新检查表明银河系过剩（GCE）主要起源于点源（PSS）。我们表明，在我们感兴趣的地区，GCE PSS的非波斯顿模板拟合（NPTF）的证据是GCE未建模的南北不对称的伪像。这种不对称性受到拟合的强烈青睐（尽管尚不清楚这是否是物理的），并且在允许时，对PSS的偏好变得微不足道。我们在模拟中重现了这种行为，包括虚假PS人群的详细特性。我们得出的结论是，GCE PSS的NTPF证据非常容易受到某些系统错误的影响，目前不应将其强度地不利于主要平滑的GCE。
We re-examine evidence that the Galactic Center Excess (GCE) originates primarily from point sources (PSs). We show that in our region of interest, non-Poissonian template fitting (NPTF) evidence for GCE PSs is an artifact of unmodeled north-south asymmetry of the GCE. This asymmetry is strongly favored by the fit (although it is unclear if this is physical), and when it is allowed, the preference for PSs becomes insignificant. We reproduce this behavior in simulations, including detailed properties of the spurious PS population. We conclude that NTPF evidence for GCE PSs is highly susceptible to certain systematic errors, and should not at present be taken to robustly disfavor a dominantly smooth GCE.
