Multi-GeV Fermi-LAT Detection of PSR B1259-63
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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866908716535644160 |
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| author | Malyshev, D. Chernyakova, M. Gallagher, A. Finn Kuzin, A. Matchett, N. Santangelo, A. Shebalkova, Iu. van Soelen, B. |
| author_facet | Malyshev, D. Chernyakova, M. Gallagher, A. Finn Kuzin, A. Matchett, N. Santangelo, A. Shebalkova, Iu. van Soelen, B. |
| contents | PSR B1259-63/LS 2883 is a classical gamma-ray binary detected from radio to TeV energies near periastron. Using over 17 years of Fermi-LAT observations, we report the first significant detection ($8σ$ in likelihood analysis) of the system in the 10-100 GeV energy range, over orbital phases from -400 to +100 days relative to periastron. The observed spectrum is well described by a power law with photon index $Γ= 1.9 \pm 0.1$ and shows a flux level consistent with that measured at TeV energies by H.E.S.S. The smooth connection between the Fermi-LAT and TeV spectra suggests that the detected multi-GeV emission traces the rising tail of the inverse-Compton component extending into the TeV regime. The presence of detectable emission hundreds of days before periastron indicates high-energy activity over a larger orbital phase range than previously established, enabling new constraints on particle-acceleration and radiative processes in the system. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2509_10037 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Multi-GeV Fermi-LAT Detection of PSR B1259-63 Malyshev, D. Chernyakova, M. Gallagher, A. Finn Kuzin, A. Matchett, N. Santangelo, A. Shebalkova, Iu. van Soelen, B. High Energy Astrophysical Phenomena PSR B1259-63/LS 2883 is a classical gamma-ray binary detected from radio to TeV energies near periastron. Using over 17 years of Fermi-LAT observations, we report the first significant detection ($8σ$ in likelihood analysis) of the system in the 10-100 GeV energy range, over orbital phases from -400 to +100 days relative to periastron. The observed spectrum is well described by a power law with photon index $Γ= 1.9 \pm 0.1$ and shows a flux level consistent with that measured at TeV energies by H.E.S.S. The smooth connection between the Fermi-LAT and TeV spectra suggests that the detected multi-GeV emission traces the rising tail of the inverse-Compton component extending into the TeV regime. The presence of detectable emission hundreds of days before periastron indicates high-energy activity over a larger orbital phase range than previously established, enabling new constraints on particle-acceleration and radiative processes in the system. |
| title | Multi-GeV Fermi-LAT Detection of PSR B1259-63 |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2509.10037 |