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

H.E.S.S. Collaboration; F. Aharonian; F. Ait Benkhali; J. Aschersleben; H. Ashkar; M. Backes; V. Barbosa Martins; R. Batzofin; Y. Becherini; D. Berge; K. Bernlohr; M. Bottcher; C. Boisson; J. Bolmont; M. De Bony De Lavergne; F. Bradascio; R. Brose; F. Brun; B. Bruno; T. Bulik; C. Burger-Scheidlin; T. Bylund; S. Casanova; R. Cecil; J. Celic; M. Cerruti; T. Chand; S. Chandra; A. Chen; J. Chibueze; O. Chibueze; T. Collins; G. Cotter; J. Damascene Mbarubucyeye; A. Djannati-Atai; J. Djuvsland; A. Dmytriiev; K. Egberts; S. Einecke; S. Fegan; G. Fontaine; S. Funk; S. Gabici; A. Mehta; M. Meyer; H. Ren; H. M. Schutte; H. Sol; T. Tanaka; A. M. Taylor; J. Vink

doi:10.1051/0004-6361/202348913

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

H.E.S.S. Collaboration
, F. Aharonian
, F. Ait Benkhali
, J. Aschersleben
, H. Ashkar
, M. Backes
, V. Barbosa Martins
, R. Batzofin
, Y. Becherini
, D. Berge
, K. Bernlohr
, M. Bottcher
, C. Boisson
, J. Bolmont
, M. De Bony De Lavergne
, F. Bradascio
, R. Brose
, F. Brun
, B. Bruno
, T. Bulik

C. Burger-Scheidlin, T. Bylund, S. Casanova, R. Cecil^*, J. Celic, M. Cerruti, T. Chand, S. Chandra, A. Chen, J. Chibueze, O. Chibueze, T. Collins, G. Cotter, J. Damascene Mbarubucyeye, A. Djannati-Atai, J. Djuvsland, A. Dmytriiev, K. Egberts, S. Einecke, S. Fegan, G. Fontaine, S. Funk, S. Gabici, A. Mehta, M. Meyer^*, H. Ren, H. M. Schutte, H. Sol, T. Tanaka, A. M. Taylor, J. Vink

^*Corresponding author for this work

Astronomy

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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.

Original language	English
Article number	A96
Number of pages	10
Journal	Astronomy & Astrophysics
Volume	685
DOIs	https://doi.org/10.1051/0004-6361/202348913
Publication status	Published - 1-May-2024

Keywords

Astroparticle physics
Galaxies: active
Galaxies: jets
Gamma rays: galaxies
Infrared: general

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10.1051/0004-6361/202348913Licence: CC BY

Curvature in the very-high energy gamma-ray spectrum of M 87Final publisher's version, 573 KBLicence: CC BY

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H.E.S.S. Collaboration, Aharonian, F., Ait Benkhali, F., Aschersleben, J., Ashkar, H., Backes, M., Martins, V. B., Batzofin, R., Becherini, Y., Berge, D., Bernlohr, K., Bottcher, M., Boisson, C., Bolmont, J., De Lavergne, M. D. B., Bradascio, F., Brose, R., Brun, F., Bruno, B., ... Vink, J. (2024). Curvature in the very-high energy gamma-ray spectrum of M 87. Astronomy & Astrophysics, 685, Article A96. https://doi.org/10.1051/0004-6361/202348913

@article{1c13949478f947809e2b4d345ad6c424,

title = "Curvature in the very-high energy gamma-ray spectrum of M 87",

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.",

keywords = "Astroparticle physics, Galaxies: active, Galaxies: jets, Gamma rays: galaxies, Infrared: general",

author = "\{H.E.S.S. Collaboration\} and F. Aharonian and \{Ait Benkhali\}, F. and J. Aschersleben and H. Ashkar and M. Backes and Martins, \{V. Barbosa\} and R. Batzofin and Y. Becherini and D. Berge and K. Bernlohr and M. Bottcher and C. Boisson and J. Bolmont and \{De Lavergne\}, \{M. De Bony\} and F. Bradascio and R. Brose and F. Brun and B. Bruno and T. Bulik and C. Burger-Scheidlin and T. Bylund and S. Casanova and R. Cecil and J. Celic and M. Cerruti and T. Chand and S. Chandra and A. Chen and J. Chibueze and O. Chibueze and T. Collins and G. Cotter and Mbarubucyeye, \{J. Damascene\} and A. Djannati-Atai and J. Djuvsland and A. Dmytriiev and K. Egberts and S. Einecke and S. Fegan and G. Fontaine and S. Funk and S. Gabici and A. Mehta and M. Meyer and H. Ren and Schutte, \{H. M.\} and H. Sol and T. Tanaka and Taylor, \{A. M.\} and J. Vink",

year = "2024",

month = may,

day = "1",

doi = "10.1051/0004-6361/202348913",

language = "English",

volume = "685",

journal = "Astronomy \& Astrophysics",

issn = "0004-6361",

publisher = " EDP Sciences",

}

H.E.S.S. Collaboration, Aharonian, F, Ait Benkhali, F, Aschersleben, J, Ashkar, H, Backes, M, Martins, VB, Batzofin, R, Becherini, Y, Berge, D, Bernlohr, K, Bottcher, M, Boisson, C, Bolmont, J, De Lavergne, MDB, 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, Mbarubucyeye, JD, Djannati-Atai, A, Djuvsland, J, Dmytriiev, A, Egberts, K, Einecke, S, Fegan, S, Fontaine, G, Funk, S, Gabici, S, Mehta, A, Meyer, M, Ren, H, Schutte, HM, Sol, H, Tanaka, T, Taylor, AM & Vink, J 2024, 'Curvature in the very-high energy gamma-ray spectrum of M 87', Astronomy & Astrophysics, vol. 685, A96. https://doi.org/10.1051/0004-6361/202348913

TY - JOUR

T1 - Curvature in the very-high energy gamma-ray spectrum of M 87

AU - H.E.S.S. Collaboration

AU - Aharonian, F.

AU - Ait Benkhali, F.

AU - Aschersleben, J.

AU - Ashkar, H.

AU - Backes, M.

AU - Martins, V. Barbosa

AU - Batzofin, R.

AU - Becherini, Y.

AU - Berge, D.

AU - Bernlohr, K.

AU - Bottcher, M.

AU - Boisson, C.

AU - Bolmont, J.

AU - De Lavergne, M. De Bony

AU - Bradascio, F.

AU - Brose, R.

AU - Brun, F.

AU - Bruno, B.

AU - Bulik, T.

AU - Burger-Scheidlin, C.

AU - Bylund, T.

AU - Casanova, S.

AU - Cecil, R.

AU - Celic, J.

AU - Cerruti, M.

AU - Chand, T.

AU - Chandra, S.

AU - Chen, A.

AU - Chibueze, J.

AU - Chibueze, O.

AU - Collins, T.

AU - Cotter, G.

AU - Mbarubucyeye, J. Damascene

AU - Djannati-Atai, A.

AU - Djuvsland, J.

AU - Dmytriiev, A.

AU - Egberts, K.

AU - Einecke, S.

AU - Fegan, S.

AU - Fontaine, G.

AU - Funk, S.

AU - Gabici, S.

AU - Mehta, A.

AU - Meyer, M.

AU - Ren, H.

AU - Schutte, H. M.

AU - Sol, H.

AU - Tanaka, T.

AU - Taylor, A. M.

AU - Vink, J.

PY - 2024/5/1

Y1 - 2024/5/1

N2 - 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.

AB - 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.

KW - Astroparticle physics

KW - Galaxies: active

KW - Galaxies: jets

KW - Gamma rays: galaxies

KW - Infrared: general

UR - https://www.scopus.com/pages/publications/85193454856

U2 - 10.1051/0004-6361/202348913

DO - 10.1051/0004-6361/202348913

M3 - Article

AN - SCOPUS:85193454856

SN - 0004-6361

VL - 685

JO - Astronomy & Astrophysics

JF - Astronomy & Astrophysics

M1 - A96

ER -

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

Abstract

Keywords

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