Millisecond Pulsars in Globular Clusters and Implications for the Galactic Center Gamma-Ray Excess
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| Format: | Preprint |
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2024
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| _version_ | 1866910066797445120 |
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| author | Amerio, Aurelio Hooper, Dan Linden, Tim |
| author_facet | Amerio, Aurelio Hooper, Dan Linden, Tim |
| contents | We study the gamma-ray emission from millisecond pulsars within the Milky Way's globular cluster system in order to measure the luminosity function of this source population. We find that these pulsars have a mean luminosity of $\langle L_γ\rangle \sim (1-8)\times 10^{33}\, {\rm erg/s}$ (integrated between 0.1 and 100 GeV) and a log-normal width of $σ_L \sim 1.4-2.8$. If the Galactic Center Gamma-Ray Excess were produced by pulsars with similar characteristics, Fermi would have already detected $N \sim 17-37$ of these sources, whereas only three such pulsar candidates have been identified. We conclude that the excess gamma-ray emission can originate from pulsars only if they are significantly less bright, on average, than those observed within globular clusters or in the Galactic Plane. This poses a serious challenge for pulsar interpretations of the Galactic Center Gamma-Ray Excess. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2412_05220 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Millisecond Pulsars in Globular Clusters and Implications for the Galactic Center Gamma-Ray Excess Amerio, Aurelio Hooper, Dan Linden, Tim High Energy Astrophysical Phenomena We study the gamma-ray emission from millisecond pulsars within the Milky Way's globular cluster system in order to measure the luminosity function of this source population. We find that these pulsars have a mean luminosity of $\langle L_γ\rangle \sim (1-8)\times 10^{33}\, {\rm erg/s}$ (integrated between 0.1 and 100 GeV) and a log-normal width of $σ_L \sim 1.4-2.8$. If the Galactic Center Gamma-Ray Excess were produced by pulsars with similar characteristics, Fermi would have already detected $N \sim 17-37$ of these sources, whereas only three such pulsar candidates have been identified. We conclude that the excess gamma-ray emission can originate from pulsars only if they are significantly less bright, on average, than those observed within globular clusters or in the Galactic Plane. This poses a serious challenge for pulsar interpretations of the Galactic Center Gamma-Ray Excess. |
| title | Millisecond Pulsars in Globular Clusters and Implications for the Galactic Center Gamma-Ray Excess |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2412.05220 |