The γ-ray spectrum of the core of Centaurus A as observed with H.E.S.S. and Fermi-LAT
Centaurus A (Cen A) is the nearest radio galaxy discovered as a very-high-energy (VHE; 100 GeV-100 TeV) $γ$-ray source by the High Energy Stereoscopic System (H.E.S.S.). It is a faint VHE $γ$-ray emitter, though its VHE flux exceeds both the extrapolation from early Fermi-LAT observations as well as...
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| Dokumenttyp: | Article (Journal) Kapitel/Artikel |
| Sprache: | Englisch |
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19 Jul 2018
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| In: |
Arxiv
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| Online-Zugang: | Verlag, Volltext: https://arxiv.org/abs/1807.07375v1
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| Verfasserangaben: | H.E.S.S. Collaboration, H. Abdalla, D. Glawion, F. Jankowsky, M. Mohamed, A. Quirrenbach, S. Schwemmer, S.J. Wagner [und weitere] |
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| 245 | 1 | 4 | |a The γ-ray spectrum of the core of Centaurus A as observed with H.E.S.S. and Fermi-LAT |c H.E.S.S. Collaboration, H. Abdalla, D. Glawion, F. Jankowsky, M. Mohamed, A. Quirrenbach, S. Schwemmer, S.J. Wagner [und weitere] |
| 246 | 3 | 3 | |a The gamma-ray spectrum of the core of Centaurus A as observed with H.E.S.S. and Fermi-LAT |
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| 520 | |a Centaurus A (Cen A) is the nearest radio galaxy discovered as a very-high-energy (VHE; 100 GeV-100 TeV) $γ$-ray source by the High Energy Stereoscopic System (H.E.S.S.). It is a faint VHE $γ$-ray emitter, though its VHE flux exceeds both the extrapolation from early Fermi-LAT observations as well as expectations from a (misaligned) single-zone synchrotron-self Compton (SSC) description. The latter atisfactorily reproduces the emission from Cen A at lower energies up to a few GeV. New observations with H.E.S.S., comparable in exposure time to those previously reported, were performed and eight years of Fermi-LAT data were accumulated to clarify the spectral characteristics of the $γ$-ray emission from the core of Cen A. The results allow us for the first time to achieve the goal of constructing a representative, contemporaneous $γ$-ray core spectrum of Cen A over almost five orders of magnitude in energy. Advanced analysis methods, including the template fitting method, allow detection in the VHE range of the core with a statistical significance of 12$σ$ on the basis of 213 hours of total exposure time. The spectrum in the energy range of 250 GeV-6 TeV is compatible with a power-law function with a photon index $Γ=2.52\pm0.13_{\mathrm{stat}}\pm0.20_{\mathrm{sys}}$. An updated Fermi-LAT analysis provides evidence for spectral hardening by $ΔΓ\simeq0.4\pm0.1$ at $γ$-ray energies above $2.8^{+1.0}_{-0.6}$ GeV at a level of $4.0σ$. The fact that the spectrum hardens at GeV energies and extends into the VHE regime disfavour a single-zone SSC interpretation for the overall spectral energy istribution (SED) of the core and is suggestive of a new $γ$-ray emitting component connecting the high-energy emission above the break energy to the one observed at VHE energies. | ||
| 700 | 1 | |a Abdalla, Hassan |e VerfasserIn |0 (DE-588)1144410142 |0 (DE-627)1004752601 |0 (DE-576)494292237 |4 aut | |
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| 700 | 1 | |a Jankowsky, Felix |e VerfasserIn |0 (DE-588)1057860042 |0 (DE-627)795338953 |0 (DE-576)413828832 |4 aut | |
| 700 | 1 | |a Mohamed, Mahmoud |e VerfasserIn |0 (DE-588)1034847023 |0 (DE-627)746328044 |0 (DE-576)382466330 |4 aut | |
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