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Spurious Point Source Signals in the Galactic Center Excess
Name
PhysRevLett.125.121105.pdf
Description
Published version
Size
603.07 KB
Format
Adobe PDF
Checksum (MD5)
b791388c6e874ec6050b1ec6b93a6fed
Author(s) •
Leane, Rebecca K
Slatyer, Tracy R
Date Issued
2020
Journal
Physical Review Letters
Publisher
American Physical Society (APS)
Version
Final published version
Abstract
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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DOI of Published Version
10.1103/PHYSREVLETT.125.121105