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Connecting the new H.E.S.S. diffuse emission at the Galactic Center with the Fermi GeV excess: A combination of millisecond pulsars and heavy dark matter?

Lacroix, Thomas; Silk, Joseph; Moulin, Emmanuel; Boehm, Celine

Connecting the new H.E.S.S. diffuse emission at the Galactic Center with the Fermi GeV excess: A combination of millisecond pulsars and heavy dark matter? Thumbnail


Authors

Thomas Lacroix

Joseph Silk

Emmanuel Moulin

Celine Boehm



Abstract

The H.E.S.S. Collaboration has reported a high-energy spherically symmetric diffuse γ-ray emission in the inner 50 pc of the Milky Way, up to ∼50 TeV. Here, we propose a leptonic model which provides an alternative to the hadronic scenario presented by the H.E.S.S. Collaboration, and connects the newly reported TeV emission to the Fermi-LAT Galactic Center GeV excess. Our model relies on a combination of inverse Compton emission from a population of millisecond pulsars—which can account for the GeV excess—and a supermassive black hole-induced spike of heavy (∼60 TeV) dark matter particles annihilating into electrons with a subthermal cross section. With an up-to-date interstellar radiation field, as well as a standard magnetic field and diffusion setup, our model accounts for the spectral morphology of the detected emission. Moreover, we show that the dark matter-induced emission reproduces the spatial morphology of the H.E.S.S. signal above ∼10 TeV, while we obtain a slightly more extended component from pulsars at lower energies, which could be used as a prediction for future H.E.S.S. observations.

Citation

Lacroix, T., Silk, J., Moulin, E., & Boehm, C. (2016). Connecting the new H.E.S.S. diffuse emission at the Galactic Center with the Fermi GeV excess: A combination of millisecond pulsars and heavy dark matter?. Physical Review D, 94(12), Article 123008. https://doi.org/10.1103/physrevd.94.123008

Journal Article Type Article
Acceptance Date Mar 20, 2016
Online Publication Date Dec 12, 2016
Publication Date Dec 12, 2016
Deposit Date Jun 19, 2016
Publicly Available Date Aug 21, 2018
Journal Physical Review D
Print ISSN 2470-0010
Electronic ISSN 2470-0029
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 94
Issue 12
Article Number 123008
DOI https://doi.org/10.1103/physrevd.94.123008
Public URL https://durham-repository.worktribe.com/output/1379038

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Copyright Statement
Reprinted with permission from the American Physical Society: Lacroix, Thomas, Silk, Joseph, Moulin, Emmanuel & Boehm, Celine (2016). Connecting the new H.E.S.S. diffuse emission at the Galactic Center with the Fermi GeV excess: A combination of millisecond pulsars and heavy dark matter? Physical Review D 94(12): 123008 © 2016 by the American Physical Society. Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modified, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society.






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