Spurious Point Source Signals in the Galactic Center Excess

Spurious Point Source Signals in the Galactic Center Excess

We reexamine 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 evidence for GCE PSs is an artifact of unmodeled north-south asymmetry of the GCE. This asymmetry is strongly favored by...

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Veröffentlicht in:Physical review letters 2020-09, Vol.125 (12), p.1-121105, Article 121105
Hauptverfasser: Leane, Rebecca K., Slatyer, Tracy R.
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ASTRONOMY AND ASTROPHYSICS
Asymmetry
Physics
Systematic errors
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Slatyer, Tracy R.
description We reexamine 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 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 the non-Poissonian template fitting 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.
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subjects ASTRONOMY AND ASTROPHYSICS
Asymmetry
Physics
Systematic errors
title Spurious Point Source Signals in the Galactic Center Excess
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