Broadband multi-wavelength properties of M87 during the 2018 EHT campaign including a very high energy flaring episode

dc.contributor.authorAlgaba, Juan Carlos
dc.contributor.authorBalokovic, M.
dc.contributor.authorChandra, S.
dc.contributor.authorCheong, W.-Y.
dc.contributor.authorCui, Y.-Z.
dc.contributor.authorD Ammando, F.
dc.contributor.authorFalcone, A.D.
dc.contributor.authorFord, N.M.
dc.contributor.authorGiroletti, M.
dc.contributor.authorGoddi, C.
dc.contributor.authorGurwell, M.A.
dc.contributor.authorHada, K.
dc.contributor.authorHaggard, D.
dc.contributor.authorJorstad, S.
dc.contributor.authorKaur, A.
dc.contributor.authorKawashima, T.
dc.contributor.authorKerby, S.
dc.contributor.authorKim, J.-Y.
dc.contributor.authorKino, M.
dc.contributor.authorKravchenko, E.V.
dc.contributor.authorLee, S.-S.
dc.contributor.authorLu, R.-S.
dc.contributor.authorMarkoff, S.
dc.contributor.authorMichail, J.
dc.contributor.authorNeilsen, J.
dc.contributor.authorNowak, M.A.
dc.contributor.authorPrincipe, G.
dc.contributor.authorRamakrishnan, V.
dc.contributor.authorRipperda, B.
dc.contributor.authorSasada, M.
dc.contributor.authorSavchenko, S.S.
dc.contributor.authorSheridan, C.
dc.contributor.authorAkiyama, Kazunori
dc.contributor.authorAlberdi, Antxon
dc.contributor.authorAlef, Walter
dc.contributor.authorAnantua, Richard
dc.contributor.authorAsada, K.
dc.contributor.authorAzulay, Rebecca
dc.contributor.authorBach, U.
dc.contributor.authorBaczko, Anne-Kathrin
dc.contributor.authorBall, David
dc.contributor.authorBandyopadhyay, B.
dc.contributor.authorBarrett, John
dc.contributor.authorBaubock, M.
dc.contributor.authorBenson, Bradford A.
dc.contributor.authorBintley, Dan
dc.contributor.authorBlackburn, Lindy
dc.contributor.authorBlundell, Raymond
dc.contributor.authorBouman, Katherine L.
dc.contributor.authorBower, Geoffrey C.
dc.contributor.authorBoyce, Hope
dc.contributor.authorBremer, Michael
dc.contributor.authorBrissenden, Roger
dc.contributor.authorBritzen, Silke
dc.contributor.authorBroderick, Avery E.
dc.contributor.authorBroguiere, Dominique
dc.contributor.authorBronzwaer, Thomas
dc.contributor.authorBustamante, S.
dc.contributor.authorCarlstrom, John E.
dc.contributor.authorChael, Andrew
dc.contributor.authorChan, Chi-kwan
dc.contributor.authorChang, D.O.
dc.contributor.authorChatterjee, Koushik
dc.contributor.authorChatterjee, Shami
dc.contributor.authorChen, Ming-Tang
dc.contributor.authorChen, Y.
dc.contributor.authorCheng, X.
dc.contributor.authorCho, Ilje
dc.contributor.authorChristian, Pierre
dc.contributor.authorConroy, N.S.
dc.contributor.authorConway, John E.
dc.contributor.authorCrawford, Thomas M.
dc.contributor.authorCrew, Geoffrey B.
dc.contributor.authorCruz-Osorio, Alejandro
dc.contributor.authorDahale, R.
dc.contributor.authorDavelaar, Jordy
dc.contributor.authorDe Laurentis, M.
dc.contributor.authorDeane, Roger
dc.contributor.authorDempsey, Jessica
dc.contributor.authorDesvignes, Gregory
dc.contributor.authorDexter, Jason
dc.contributor.authorDhruv, V.
dc.contributor.authorDihingia, I.K.
dc.contributor.authorDoeleman, Sheperd S.
dc.contributor.authorDzib, S.A.
dc.contributor.authorEatough, Ralph P.
dc.contributor.authorEmami, R.
dc.contributor.authorFalcke, Heino
dc.contributor.authorFarah, Joseph
dc.contributor.authorFish, Vincent L.
dc.contributor.authorFomalont, Ed
dc.contributor.authorFord, H. Alyson
dc.contributor.authorFoschi, M.
dc.contributor.authorFraga-Encinas, Raquel
dc.contributor.authorFreeman, W.T.
dc.contributor.authorFriberg, Per
dc.contributor.authorFromm, Christian M.
dc.contributor.authorFuentes, Antonio
dc.contributor.authorGalison, Peter
dc.contributor.authorGammie, Charles F.
dc.contributor.authorGarcia, Roberto
dc.contributor.authorGentaz, Olivier
dc.contributor.authorGeorgiev, Boris
dc.contributor.authorGold, Roman
dc.contributor.authorGomez-Ruiz, Arturo I.
dc.contributor.authorGomez, Jose L.
dc.contributor.authorGu, Minfeng
dc.contributor.authorHesper, Ronald
dc.contributor.authorHeumann, D.
dc.contributor.authorHo, Luis C.
dc.contributor.authorHo, Paul
dc.contributor.authorHonma, Mareki
dc.contributor.authorHuang, Chih-Wei L.
dc.contributor.authorHuang, Lei
dc.contributor.authorHughes, David H.
dc.contributor.authorIkeda, Shiro
dc.contributor.authorImpellizzeri, C.M.V.
dc.contributor.authorInoue, Makoto
dc.contributor.authorIssaoun, Sara
dc.contributor.authorJames, David J.
dc.contributor.authorJannuzi, Buell T.
dc.contributor.authorJanssen, Michael
dc.contributor.authorJeter, Britton
dc.contributor.authorJiang, Wu
dc.contributor.authorJimenez-Rosales, Alejandra
dc.contributor.authorJohnson, Michael D.
dc.contributor.authorJones, A.C.
dc.contributor.authorJoshi, A.V.
dc.contributor.authorJung, Taehyun
dc.contributor.authorKaruppusamy, Ramesh
dc.contributor.authorKeating, G.K.
dc.contributor.authorKettenis, Mark
dc.contributor.authorKim, Dong-Jin
dc.contributor.authorKim, Jongsoo
dc.contributor.authorKim, Junhan
dc.contributor.authorKoay, Jun Yi
dc.contributor.authorKocherlakota, P.
dc.contributor.authorKofuji, Yutaro
dc.contributor.authorKoch, Patrick M.
dc.contributor.authorKoyama, Shoko
dc.contributor.authorKramer, Carsten
dc.contributor.authorKramer, J.A.
dc.contributor.authorKramer, Michael
dc.contributor.authorKrichbaum, T.P.
dc.contributor.authorKuo, Cheng-Yu
dc.contributor.authorLa Bella, N.
dc.contributor.authorLevis, Aviad
dc.contributor.authorLi, Zhiyuan
dc.contributor.authorLico, Rocco
dc.contributor.authorLindahl, Greg
dc.contributor.authorLindqvist, M.
dc.contributor.authorLisakov, M.
dc.contributor.authorLiu, Jun
dc.contributor.authorLiu, Kuo
dc.contributor.authorLiuzzo, Elisabetta
dc.contributor.authorLo, Wen-Ping
dc.contributor.authorLobanov, Andrei P.
dc.contributor.authorLoinard, Laurent
dc.contributor.authorLonsdale, Colin
dc.contributor.authorLowitz, A.E.
dc.contributor.authorMacDonald, Nicholas R.
dc.contributor.authorMao, Jirong
dc.contributor.authorMarchili, Nicola
dc.contributor.authorMarrone, Daniel P.
dc.contributor.authorMarscher, Alan P.
dc.contributor.authorMarti-Vidal, Ivan
dc.contributor.authorMatsushita, Satoki
dc.contributor.authorMatthews, Lynn D.
dc.contributor.authorMedeiros, Lia
dc.contributor.authorMenten, Karl M.
dc.contributor.authorMizuno, Izumi
dc.contributor.authorMizuno, Yosuke
dc.contributor.authorMontgomery, J
dc.contributor.authorMoran, James M.
dc.contributor.authorMoriyama, Kotaro
dc.contributor.authorMoscibrodzka, Monika
dc.contributor.authorMulaudzi, W.
dc.contributor.authorMuller, Cornelia
dc.contributor.authorMuller, H
dc.contributor.authorMus, A.
dc.contributor.authorMusoke, Gibwa
dc.contributor.authorMyserlis, I.
dc.contributor.authorNagai, Hiroshi
dc.contributor.authorNagar, Neil M.
dc.contributor.authorNair, D.G.
dc.contributor.authorNakamura, Masanori
dc.contributor.authorNarayanan, Gopal
dc.contributor.authorNatarajan, Iniyan
dc.contributor.authorNathanail, Antonios
dc.contributor.authorNavarro Fuentes, S.
dc.contributor.authorNi, Chunchong
dc.contributor.authorOh, J.
dc.contributor.authorOkino, Hiroki
dc.contributor.authorOlivares, Hector
dc.contributor.authorOyama, Tomoaki
dc.contributor.authorOzel, Feryal
dc.contributor.authorPalumbo, Daniel C. M.
dc.contributor.authorFiipos Paraschos, G.
dc.contributor.authorPark, J.
dc.contributor.authorParsons, H.
dc.contributor.authorPatel, Nimesh
dc.contributor.authorPen, Ue-Li
dc.contributor.authorPesce, Dominic W.
dc.contributor.authorPietu, Vincent
dc.contributor.authorPopStefanija, Aleksandar
dc.contributor.authorPorth, Oliver
dc.contributor.authorPrather, Ben
dc.contributor.authorPsaltis, Dimitrios
dc.contributor.authorPu, Hung-Yi
dc.contributor.authorRao, Ramprasad
dc.contributor.authorRawlings, Mark G.
dc.contributor.authorRaymond, Alexander W.
dc.contributor.authorRezzolla, Luciano
dc.contributor.authorRicarte, Angelo
dc.contributor.authorRoelofs, Freek
dc.contributor.authorRomero-Canizales, C.
dc.contributor.authorRos, Eduardo
dc.contributor.authorRoshanineshat, Arash
dc.contributor.authorRottmann, Helge
dc.contributor.authorRoy, Alan L.
dc.contributor.authorRuiz, I.
dc.contributor.authorRuszczyk, Chet
dc.contributor.authorRygl, Kazi L. J.
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dc.contributor.authorTiede, Paul
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dc.contributor.authorVos, J.
dc.contributor.authorWagner, Jan
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dc.contributor.authorWilliams, D.A.
dc.contributor.authorWong, S.L.
dc.contributor.authorChen, Z.
dc.contributor.authorCui, L.
dc.contributor.authorHirota, T.
dc.contributor.authorLi, B.
dc.contributor.authorLi, G.
dc.contributor.authorLiu, Q.
dc.contributor.authorLiu, X.
dc.contributor.authorLiu, Z.
dc.contributor.authorMa, J.
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dc.contributor.authorRo, H.
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dc.contributor.authorSawada-Satoh, S.
dc.contributor.authorWajima, K.
dc.contributor.authorWang, J.
dc.contributor.authorWang, N.
dc.contributor.authorXia, B.
dc.contributor.authorYan, H.
dc.contributor.authorYonekura, Y.
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dc.contributor.emailroger.deane@up.ac.za
dc.date.accessioned2025-06-09T11:59:59Z
dc.date.available2025-06-09T11:59:59Z
dc.date.issued2024-12-13
dc.descriptionDATA AVAILABILITY : Tables from Appendix C (from C.1 to C.15) are available at the CDS via anonymous ftp to cdsarc.cds.unistra.fr (130.79.128.5) or via https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/692/A140. Data products presented in this paper are available for download through the EHT Collaboration Data Webpage (https://eventhorizontelescope.org/for-astronomers/data), or directly from the CyVerse repository. The repository contains the following data products: Broadband spectrum table with frequency, flux density, its uncertainty, and instrument index (format: DAT) Sampled posterior distributions of the SED broadband spectral model (A-PL) described in Sect. 4.2 (format: DAT) Sampled posterior distributions of the SED broadband spectral model (A-BPL) described in Sect. 4.3 (format: DAT) Sampled posterior distributions of the SED broadband spectral model (B) described in Sect. 4.3 (format: DAT)
dc.description.abstractCONTEXT : The nearby elliptical galaxy M87 contains one of only two supermassive black holes whose emission surrounding the event horizon has been imaged by the Event Horizon Telescope (EHT). In 2018, more than two dozen multi-wavelength (MWL) facilities (from radio to γ-ray energies) took part in the second M87 EHT campaign. AIMS. The goal of this extensive MWL campaign was to better understand the physics of the accreting black hole M87*, the relationship between the inflow and inner jets, and the high-energy particle acceleration. Understanding the complex astrophysics is also a necessary first step towards performing further tests of general relativity. METHODS : The MWL campaign took place in April 2018, overlapping with the EHT M87* observations. We present a new, contemporaneous spectral energy distribution (SED) ranging from radio to very high-energy (VHE) γ-rays as well as details of the individual observations and light curves. We also conducted phenomenological modelling to investigate the basic source properties. RESULTS : We present the first VHE γ-ray flare from M87 detected since 2010. The flux above 350 GeV more than doubled within a period of ≈36 hours. We find that the X-ray flux is enhanced by about a factor of two compared to 2017, while the radio and millimetre core fluxes are consistent between 2017 and 2018. We detect evidence for a monotonically increasing jet position angle that corresponds to variations in the bright spot of the EHT image. CONCLUSIONS : Our results show the value of continued MWL monitoring together with precision imaging for addressing the origins of high-energy particle acceleration. While we cannot currently pinpoint the precise location where such acceleration takes place, the new VHE γ-ray flare already presents a challenge to simple one-zone leptonic emission model approaches, and it emphases the need for combined image and spectral modelling.
dc.description.departmentPhysics
dc.description.librarianom2025
dc.description.sdgSDG-09: Industry, innovation and infrastructure
dc.description.sdgSDG-04: Quality Education
dc.description.sponsorshipSponsors are listed under Appendix A.
dc.description.urihttps://www.aanda.org/
dc.identifier.citationAlgaba, J.C., Baloković, M., Chandra, S. et al. 2024, 'Broadband multi-wavelength properties of M87 during the 2018 EHT campaign including a very high energy flaring episode', vol. 692, art. A140, pp. 1-44, doi : 10.1051/0004-6361/202450497.
dc.identifier.issn0004-6361 (print)
dc.identifier.issn1432-0746 (online)
dc.identifier.other10.1051/0004-6361/202450497
dc.identifier.urihttp://hdl.handle.net/2263/102739
dc.language.isoen
dc.publisherEDP Sciences
dc.rights© The Authors 2024. Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
dc.subjectGalaxies: active
dc.subjectGalaxies: individual: M87
dc.subjectGalaxies: jets
dc.subjectGalaxies: nuclei
dc.subjectVery high-energy (VHE)
dc.subjectMulti-wavelength (MWL)
dc.subjectEvent Horizon Telescope (EHT)
dc.subjectSpectral energy distribution (SED)
dc.titleBroadband multi-wavelength properties of M87 during the 2018 EHT campaign including a very high energy flaring episode
dc.typeArticle

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