TY - JOUR
T1 - Probing the morphology of the low state gamma-ray emission of M87 with H.E.S.S.
AU - H.E.S.S. Collaboration
AU - Martins, Victor Barbosa
AU - Ohm, Stefan
AU - Arcaro, Cornelia
AU - Żywucka, Natalia
AU - de Naurois, Mathieu
N1 - Publisher Copyright:
© Copyright owned by the author(s) under the terms of the Creative Commons.
PY - 2024/9/27
Y1 - 2024/9/27
N2 - This work aims to study the very-high-energy (VHE; 100 GeV - 100 TeV) gamma-ray emission from M 87, especially its low state emission, and probe a potential hadronic emission component in the inner Virgo Cluster. Probing a steady and extended gamma-ray signal around M 87 allows us to investigate the AGN feedback as a heating mechanism in the Virgo Cluster. We used High Energy Stereoscopic System (H.E.S.S.) observations of M 87 from 2004 to 2021 to study the source. We utilized the Bayesian block technique to identify M 87 emission states and isolate its low state. We fitted the morphology of the 120 h low state data and found no significant gamma-ray extension. We derived an upper limit on the extension that for the first time excludes the radio lobes (≈30 kpc) as the main component of the VHE gamma-ray emission from the low state of M 87. The VHE gamma-ray emission from the distinct source states of M 87 are compatible with each other and with the radio core of M 87. Based on two different models we constrained the maximum cosmic-ray to thermal pressure ratio and the total energy in CRp in the inner 20 kpc of the Virgo Cluster [1].
AB - This work aims to study the very-high-energy (VHE; 100 GeV - 100 TeV) gamma-ray emission from M 87, especially its low state emission, and probe a potential hadronic emission component in the inner Virgo Cluster. Probing a steady and extended gamma-ray signal around M 87 allows us to investigate the AGN feedback as a heating mechanism in the Virgo Cluster. We used High Energy Stereoscopic System (H.E.S.S.) observations of M 87 from 2004 to 2021 to study the source. We utilized the Bayesian block technique to identify M 87 emission states and isolate its low state. We fitted the morphology of the 120 h low state data and found no significant gamma-ray extension. We derived an upper limit on the extension that for the first time excludes the radio lobes (≈30 kpc) as the main component of the VHE gamma-ray emission from the low state of M 87. The VHE gamma-ray emission from the distinct source states of M 87 are compatible with each other and with the radio core of M 87. Based on two different models we constrained the maximum cosmic-ray to thermal pressure ratio and the total energy in CRp in the inner 20 kpc of the Virgo Cluster [1].
M3 - Conference article
AN - SCOPUS:85185609443
SN - 1824-8039
VL - 444
JO - Proceedings of Science
JF - Proceedings of Science
M1 - 696
T2 - 38th International Cosmic Ray Conference, ICRC 2023
Y2 - 26 July 2023 through 3 August 2023
ER -