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Improved Galactic diffuse emission model strengthens the case for a Millisecond Pulsar explanation of the Fermi GeV excess
by Oscar Macias, Martin Pohl, Chris Gordon, and Phaedra Coleman
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Submission summary
| Authors (as registered SciPost users): | Oscar Macias |
| Submission information | |
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| Preprint Link: | scipost_202208_00083v1 (pdf) |
| Date accepted: | 2022-11-11 |
| Date submitted: | 2022-08-30 11:45 |
| Submitted by: | Macias, Oscar |
| Submitted to: | SciPost Physics Proceedings |
| Proceedings issue: | 14th International Conference on Identification of Dark Matter (IDM2022) |
| Ontological classification | |
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| Academic field: | Physics |
| Specialties: |
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| Approach: | Phenomenological |
Abstract
After more than a decade since its discovery, the Galactic center gamma-ray excess -- discovered with the Fermi Large Area Telescope -- remains puzzling. While the spectrum of the signal can be explained by either dark matter or an unresolved population of millisecond pulsars, the spatial morphology of this excess seems to hold the key to separate the two theories. In this contribution, we present the results of a recent study in which we use bleeding edge models for interstellar gas, inverse Compton emission, and stellar mass models to reanalyze the Galactic center excess. We find that the spatial morphology of the excess is highly correlated with stellar matter in the Galactic bulge, providing strong support for the millisecond pulsar hypothesis.
Published as SciPost Phys. Proc. 12, 049 (2023)
Reports on this Submission
Strengths
1. The origin of the Galactic centre gamma-ray excess has been a long-standing puzzle, for which this study takes an improved Galactic model, and shows that no dark matter is actually needed.
2. The manuscript is really concise and clear in illustrating their main results, while referring to their previous publications for more technical details.
Weaknesses
None.
Report
I recommend the publication of this manuscript on SciPost Physics Proceedings, as it definitely transcends the criteria of the journal.
Requested changes
None