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

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.

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Item Permalink: https://hdl.handle.net/21.11116/0000-000F-5598-6 Version Permalink: https://hdl.handle.net/21.11116/0000-000F-5599-5

Genre: Journal Article

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https://www.aanda.org/articles/aa/pdf/2024/05/aa48913-23.pdf (Publisher version) Open Access Gold

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Creators:
H.E.S.S. Collaboration, Author
Aharonian, F.¹, Author
Benkhali, F. Ait, Author
Aschersleben, J., Author
Ashkar, H., Author
Backes, M., Author
Barbosa Martins, V. , Author
Batzofin, R., Author
Becherini, Y., Author
Berge, D., Author
Bernlöhr, K.¹, Author
Böttcher, M., Author
Boisson, C., Author
Bolmont, J., Author
Bony de de Lavergne, M. , Author
Bradascio, F., Author
Brose, R., Author
Brun, F., Author
Bruno, B., Author
Bulik, T., Author
Burger-Scheidlin, C., AuthorBylund, T., AuthorCasanova, S., AuthorCecil, R., AuthorCelic, J., AuthorCerruti, M., AuthorChand, T., AuthorChandra, S., AuthorChen, A., AuthorChibueze, J., AuthorChibueze, O., AuthorCollins, T., AuthorCotter, G., AuthorDamascene Mbarubucyeye, J. , AuthorDjannati-Ataï, A., AuthorDjuvsland, J.¹, Author               Dmytriiev, A., AuthorEgberts, K., AuthorEinecke, S., AuthorFegan, S., AuthorFontaine, G., AuthorFunk, S., AuthorGabici, S., AuthorGlicenstein, J. F., AuthorGlombitza, J., AuthorGrolleron, G., AuthorHaerer, L.¹, Author               Hofmann, W.², Author               Holch, T. L., AuthorHoller, M., AuthorHorns, D., AuthorJamrozy, M., AuthorJankowsky, F., AuthorJoshi, V., AuthorJung-Richardt, I., AuthorKasai, E., AuthorKatarzynski, K., AuthorKhatoon, R., AuthorKhélifi, B., AuthorKluzniak, W., AuthorKomin, Nu., AuthorKosack, K., AuthorKostunin, D., AuthorKundu, A., AuthorLang, R. G., AuthorLe Stum, S., AuthorLeitl, F., AuthorLemière, A., AuthorLemoine-Goumard, M., AuthorLenain, J.-P., AuthorLypova, I., AuthorLuashvili, A., AuthorMackey, J., AuthorMalyshev, D., AuthorMartí-Devesa, G., AuthorMarx, R., AuthorMehta, A., AuthorMeyer, M., AuthorMitchell, A., AuthorModerski, R., AuthorMoghadam, M. O., AuthorMohrmann, L.¹, Author               Montanari, A., AuthorMoulin, E., AuthorMurach, T., Authorde Naurois, M., AuthorNiemiec, J., AuthorOhm, S., AuthorOlivera Nieto, L.¹, Author               Ona de Wilhelmi, E. , AuthorPanny, S., AuthorPanter, M.¹, Author         Parsons, R. D., AuthorPensec, U., AuthorPita, S., AuthorPühlhofer, G., AuthorPunch, M., AuthorQuirrenbach, A., AuthorRegeard, M., AuthorReimer, A., AuthorReimer, O., AuthorRen, H.¹, Author               Reville, B.³, Author               Rieger, F.¹, Author               Rudak, B., AuthorRuiz-Velasco, E.¹, Author               Sahakian, V., AuthorSalzmann, H., AuthorSantangelo, A., AuthorSasaki, M., AuthorSchüssler, F., AuthorSchutte, H. M., AuthorShapopi, J. N. S., AuthorSol, H., AuthorSpencer, S., AuthorStawarz, Ł., AuthorSteenkamp, R., AuthorSteinmassl, S.¹, Author               Steppa, C., AuthorStreil, K., AuthorTakahashi, T., AuthorTanaka, T., AuthorTaylor, A. M., AuthorTerrier, R., AuthorTsirou, M., Authorvan Eldik, C., AuthorVenter, C., AuthorVink, J., AuthorWach, T., AuthorWagner, S. J., AuthorWierzcholska, A., AuthorZacharias, M., AuthorZdziarski, A. A., AuthorZech, A., AuthorZilberman, P., AuthorZywucka, N., Author more..

Affiliations:
1Division Prof. Dr. James A. Hinton, MPI for Nuclear Physics, Max Planck Society, ou_2074298
2Prof. Werner Hofmann, Emeriti, MPI for Nuclear Physics, Max Planck Society, ou_3188608
3Brian Reville, Astrophysical Plasma Theory (APT) - Max Planck Research Group, Junior Research Groups, MPI for Nuclear Physics, Max Planck Society, ou_3055242

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Free keywords: astroparticle physics / galaxies: active / galaxies: jets / gamma rays: galaxies / infrared: general

MPINP: HESS - Abteilung Hinton

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.

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Dates: Published Online: 2024-05-15

Publication Status: Published online

Pages: 10

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Identifiers: DOI: 10.1051/0004-6361/202348913

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Title: Astronomy and Astrophysics

Other : Astron. Astrophys.

Abbreviation : A&A

Source Genre: Journal

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Publ. Info: Les Ulis Cedex A France : EDP Sciences

Pages: - Volume / Issue: 685 Sequence Number: A96 Start / End Page: - Identifier: ISSN: 1432-0746
ISSN: 0004-6361
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1