English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The leading explanation of the $\textit{Fermi}$ Galactic center $\gamma$-rayexcess is the extended emission from a unresolved population of millisecondpulsars (MSPs) in the Galactic bulge. Such a population would, along with theprompt $\gamma$ rays, also inject large quantities of electrons/positrons($e^\pm$) into the interstellar medium. These $e^\pm$ could potentiallyinverse-Compton (IC) scatter ambient photons into $\gamma$ rays that fallwithin the sensitivity range of the upcoming Cherenkov Telescope Array (CTA).In this article, we examine the detection potential of CTA to this signature bymaking a realistic estimation of the systematic uncertainties on the Galacticdiffuse emission model at TeV-scale $\gamma$-ray energies. We forecast that, inthe event that $e^\pm$ injection spectra are harder than $E^{-2}$, CTA has thepotential to robustly discover the IC signature of a putative Galactic bulgeMSP population sufficient to explain the GCE for $e^\pm$ injection efficienciesin the range $\approx 2.9-74.1\%$, or higher, depending on the level ofmismodeling of the Galactic diffuse emission components. On the other hand, forspectra softer than $E^{-2.5}$, a reliable CTA detection would require anunphysically large $e^\pm$ injection efficiency of $\gtrsim 158\%$. However,even this pessimistic conclusion may be avoided in the plausible event that MSPobservational and/or modeling uncertainties can be reduced. We further findthat, in the event that an IC signal were detected, CTA can successfullydiscriminate between an MSP and a dark matter origin for the radiating $e^\pm$.

Cherenkov Telescope Array sensitivity to the putative millisecond pulsar population responsible for the Galactic center excess