Curvature in the very-high energy gamma-ray spectrum of M 87

H.E.S.S. Collaboration; Aharonian, F.; Benkhali, F. Ait; Aschersleben, J.; Ashkar, H.; Backes, M.; Barbosa Martins, V.; Batzofin, R.; Becherini, Y.; Berge, D.; Bernlöhr, K.; Böttcher, M.; Boisson, C.; Bolmont, J.; Bony de de Lavergne, M.; Bradascio, F.; Brose, R.; Brun, F.; Bruno, B.; Bulik, T.; Burger-Scheidlin, C.; Bylund, T.; Casanova, S.; Cecil, R.; Celic, J.; Cerruti, M.; Chand, T.; Chandra, S.; Chen, A.; Chibueze, J.; Chibueze, O.; Collins, T.; Cotter, G.; Damascene Mbarubucyeye, J.; Djannati-Ataï, A.; Djuvsland, J.; Dmytriiev, A.; Egberts, K.; Einecke, S.; Fegan, S.; Fontaine, G.; Funk, S.; Gabici, S.; Glicenstein, J. F.; Glombitza, J.; Grolleron, G.; Haerer, L.; Hofmann, W.; Holch, T. L.; Holler, M.; Horns, D.; Jamrozy, M.; Jankowsky, F.; Joshi, V.; Jung-Richardt, I.; Kasai, E.; Katarzynski, K.; Khatoon, R.; Khélifi, B.; Kluzniak, W.; Komin, Nu.; Kosack, K.; Kostunin, D.; Kundu, A.; Lang, R. G.; Le Stum, S.; Leitl, F.; Lemière, A.; Lemoine-Goumard, M.; Lenain, J.-P.; Lypova, I.; Luashvili, A.; Mackey, J.; Malyshev, D.; Martí-Devesa, G.; Marx, R.; Mehta, A.; Meyer, M.; Mitchell, A.; Moderski, R.; Moghadam, M. O.; Mohrmann, L.; Montanari, A.; Moulin, E.; Murach, T.; de Naurois, M.; Niemiec, J.; Ohm, S.; Olivera Nieto, L.; Ona de Wilhelmi, E.; Panny, S.; Panter, M.; Parsons, R. D.; Pensec, U.; Pita, S.; Pühlhofer, G.; Punch, M.; Quirrenbach, A.; Regeard, M.; Reimer, A.; Reimer, O.; Ren, H.; Reville, B.; Rieger, F.; Rudak, B.; Ruiz-Velasco, E.; Sahakian, V.; Salzmann, H.; Santangelo, A.; Sasaki, M.; Schüssler, F.; Schutte, H. M.; Shapopi, J. N. S.; Sol, H.; Spencer, S.; Stawarz, Ł.; Steenkamp, R.; Steinmassl, S.; Steppa, C.; Streil, K.; Takahashi, T.; Tanaka, T.; Taylor, A. M.; Terrier, R.; Tsirou, M.; van Eldik, C.; Venter, C.; Vink, J.; Wach, T.; Wagner, S. J.; Wierzcholska, A.; Zacharias, M.; Zdziarski, A. A.; Zech, A.; Zilberman, P.; Zywucka, N.

doi:10.1051/0004-6361/202348913

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Curvature in the very-high energy gamma-ray spectrum of M 87

MPS-Authors

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Aharonian, F.
Division Prof. Dr. James A. Hinton, MPI for Nuclear Physics, Max Planck Society;

/persons/resource/persons30300

Bernlöhr, K.
Division Prof. Dr. James A. Hinton, MPI for Nuclear Physics, Max Planck Society;

/persons/resource/persons293014

Djuvsland, J.
Division Prof. Dr. James A. Hinton, MPI for Nuclear Physics, Max Planck Society;

/persons/resource/persons291361

Haerer, L.
Division Prof. Dr. James A. Hinton, MPI for Nuclear Physics, Max Planck Society;

/persons/resource/persons30605

Hofmann, W.
Prof. Werner Hofmann, Emeriti, MPI for Nuclear Physics, Max Planck Society;

/persons/resource/persons267367

Mohrmann, L.
Division Prof. Dr. James A. Hinton, MPI for Nuclear Physics, Max Planck Society;

/persons/resource/persons242418

Olivera Nieto, L.
Division Prof. Dr. James A. Hinton, MPI for Nuclear Physics, Max Planck Society;

/persons/resource/persons30878

Panter, M.
Division Prof. Dr. James A. Hinton, MPI for Nuclear Physics, Max Planck Society;

/persons/resource/persons265621

Ren, H.
Division Prof. Dr. James A. Hinton, MPI for Nuclear Physics, Max Planck Society;

/persons/resource/persons30940

Reville, B.
Brian Reville, Astrophysical Plasma Theory (APT) - Max Planck Research Group, Junior Research Groups, MPI for Nuclear Physics, Max Planck Society;

/persons/resource/persons30943

Rieger, F.
Division Prof. Dr. James A. Hinton, MPI for Nuclear Physics, Max Planck Society;

/persons/resource/persons252628

Ruiz-Velasco, E.
Division Prof. Dr. James A. Hinton, MPI for Nuclear Physics, Max Planck Society;

/persons/resource/persons240503

Steinmassl, S.
Division Prof. Dr. James A. Hinton, MPI for Nuclear Physics, Max Planck Society;

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Citation

H.E.S.S. Collaboration, Aharonian, F., Benkhali, F. A., Aschersleben, J., Ashkar, H., Backes, M., et al. (2024). Curvature in the very-high energy gamma-ray spectrum of M 87. Astronomy and Astrophysics, 685: A96. doi:10.1051/0004-6361/202348913.

Cite as: https://hdl.handle.net/21.11116/0000-000F-5598-6

Abstract

The radio galaxy M 87 is a variable very-high energy (VHE) gamma-ray source, exhibiting three major flares, which were reported in 2005, 2008, and 2010. Despite extensive studies, the origin of the VHE gamma-ray emission is not yet fully understood. In this study, we investigate the VHE gamma-ray spectrum of M 87 during states of high gamma-ray activity, utilizing 20.2 h of H.E.S.S. observations. Our findings indicate a preference for a curved spectrum, characterized by a log-parabola model with extra-galactic background light (EBL) model above 0.3 TeV at the 4σ level, compared to a power-law spectrum with EBL. We investigate the degeneracy between the absorption feature and the EBL normalization and derive upper limits on EBL models that are mainly sensitive in the wavelength range of 12.4 μm–40 μm.