Periastron Observations of TeV Gamma-Ray Emission from a Binary System with a 
50-year Period

The VERITAS Collaboration,; MAGIC Collaboration,; Abeysekara, A. U.; Benbow, W.; Bird, R.; Brill, A.; Brose, R.; Buckley, J. H.; Chromey, A. J.; Daniel, M. K.; Falcone, A.; Finley, J. P.; Fortson, L.; Furniss, A.; Gent, A.; Gillanders, G. H.; Hanna, D.; Hassan, T.; Hervet, O.; Holder, J.; Hughes, G.; Humensky, T. B.; Kaaret, P.; Kar, P.; Kertzman, M.; Kieda, D.; Krause, M.; Krennrich, F.; Kumar, S.; Lang, M. J.; Lin, T. T. Y.; Maier, G.; Moriarty, P.; Mukherjee, R.; O'Brien, S.; Ong, R. A.; Otte, A. N.; Park, N.; Petrashyk, A.; Pohl, M.; Pueschel, E.; Quinn, J.; Ragan, K.; Richards, G. T.; Roache, E.; Sadeh, I.; Santander, M.; Schlenstedt, S.; Sembroski, G. H.; Sushch, I.; Tyler, J.; Vassiliev, V. V.; Wakely, S. P.; Weinstein, A.; Wells, R. M.; Wilcox, P.; Wilhelm, A.; Williams, D. A.; J Williamson, T.; Zitzer, B.; Acciari, V. A.; Ansoldi, S.; Antonelli, L. A.; Arbet Engels, A.; Baack, D.; Babić, A.; Banerjee, B.; Barres de Almeida, U.; Barrio, J. A.; Becerra González, J.; Bednarek, W.; Bernardini, E.; Berti, A.; Besenrieder, J.; Bhattacharyya, W.; Bigongiari, C.; Biland, A.; Blanch, O.; Bonnoli, G.; Busetto, G.; Carosi, R.; Ceribella, G.; Cikota, S.; Colak, S. M.; Colin, P.; Colombo, E.; Contreras, J. L.; Cortina, J.; Covino, S.; D'Elia, V.; Da Vela, P.; Dazzi, F.; De Angelis, A.; De Lotto, B.; Delfino, M.; Delgado, J.; Di Pierro, F.; Do Souto Espiñera, E.; Domínguez, A.; Dominis Prester, D.; Dorner, D.; Doro, M.; Einecke, S.; Elsaesser, D.; Fallah Ramazani, V.; Fattorini, A.; Fernández-Barral, A.; Ferrara, G.; Fidalgo, D.; Foffano, L.; Fonseca, M. V.; Font, L.; Fruck, C.; Galindo, D.; Gallozzi, S.; García López, R. J.; Garczarczyk, M.; Gasparyan, S.; Gaug, M.; Giammaria, P.; Godinović, N.; Guberman, D.; Hadasch, D.; Hahn, A.; Hassan, T.; Herrera, J.; Hoang, J.; Hrupec, D.; Inoue, S.; Ishio, K.; Iwamura, Y.; Kubo, H.; Kushida, J.; Kuveždić, D.; Lamastra, A.; Lelas, D.; Leone, F.; Lindfors, E.; Lombardi, S.; Longo, F.; López, M.; López-Oramas, A.; Machado de Oliveira Fraga, B.; Maggio, C.; Majumdar, P.; Makariev, M.; Mallamaci, M.; Maneva, G.; Manganaro, M.; Mannheim, K.; Maraschi, L.; Mariotti, M.; Martínez, M.; Masuda, S.; Mazin, D.; Minev, M.; Miranda, J. M.; Mirzoyan, R.; Molina, E.; Moralejo, A.; Moreno, V.; Moretti, E.; Munar-Adrover, P.; Neustroev, V.; Niedzwiecki, A.; Nievas Rosillo, M.; Nigro, C.; Nilsson, K.; Ninci, D.; Nishijima, K.; Noda, K.; Nogués, L.; Nöthe, M.; Paiano, S.; Palacio, J.; Paneque, D.; Paoletti, R.; Paredes, J. M.; Pedaletti, G.; Peñil, P.; Peresano, M.; Persic, M.; Prada Moroni, P. G.; Prandini, E.; Puljak, I.; Garcia, J. R.; Rhode, W.; Ribó, M.; Rico, J.; Righi, C.; Rugliancich, A.; Saha, L.; Sahakyan, N.; Saito, T.; Satalecka, K.; Schweizer, T.; Sitarek, J.; Šnidarić, I.; Sobczynska, D.; Somero, A.; Stamerra, A.; Strzys, M.; Surić, T.; Tavecchio, F.; Temnikov, P.; Terzić, T.; Teshima, M.; Torres-Albà, N.; Tsujimoto, S.; van Scherpenberg, J.; Vanzo, G.; Vazquez Acosta, M.; Vovk, I.; Will, M.; Zarić, D.

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Periastron Observations of TeV Gamma-Ray Emission from a Binary System with a 50-year Period

MPS-Authors

The VERITAS Collaboration,
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

MAGIC Collaboration,
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Abeysekara, A. U.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Benbow, W.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Bird, R.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Brill, A.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Brose, R.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Buckley, J. H.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Chromey, A. J.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Daniel, M. K.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Falcone, A.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Finley, J. P.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Fortson, L.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Furniss, A.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Gent, A.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Gillanders, G. H.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Hanna, D.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Hassan, T.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Hervet, O.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Holder, J.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Hughes, G.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Humensky, T. B.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Kaaret, P.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Kar, P.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Kertzman, M.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Kieda, D.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Krause, M.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Krennrich, F.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Kumar, S.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Lang, M. J.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Lin, T. T. Y.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Maier, G.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Moriarty, P.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Mukherjee, R.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

O'Brien, S.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Ong, R. A.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Otte, A. N.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Park, N.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Petrashyk, A.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Pohl, M.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Pueschel, E.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Quinn, J.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Ragan, K.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Richards, G. T.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Roache, E.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Sadeh, I.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Santander, M.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Schlenstedt, S.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Sembroski, G. H.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Sushch, I.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Tyler, J.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Vassiliev, V. V.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Wakely, S. P.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Weinstein, A.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Wells, R. M.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Wilcox, P.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Wilhelm, A.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Williams, D. A.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

J Williamson, T.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Zitzer, B.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Acciari, V. A.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Ansoldi, S.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Antonelli, L. A.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Arbet Engels, A.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Baack, D.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Babić, A.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Banerjee, B.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Barres de Almeida, U.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Barrio, J. A.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Becerra González, J.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Bednarek, W.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Bernardini, E.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Berti, A.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Besenrieder, J.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Bhattacharyya, W.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Bigongiari, C.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Biland, A.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Blanch, O.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Bonnoli, G.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Busetto, G.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Carosi, R.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Ceribella, G.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Cikota, S.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Colak, S. M.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Colin, P.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Colombo, E.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Contreras, J. L.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Cortina, J.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Covino, S.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

D'Elia, V.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Da Vela, P.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Dazzi, F.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

De Angelis, A.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

De Lotto, B.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Delfino, M.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Delgado, J.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Di Pierro, F.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Do Souto Espiñera, E.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Domínguez, A.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Dominis Prester, D.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Dorner, D.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Doro, M.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Einecke, S.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Elsaesser, D.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Fallah Ramazani, V.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Fattorini, A.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Fernández-Barral, A.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Ferrara, G.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Fidalgo, D.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Foffano, L.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Fonseca, M. V.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Font, L.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Fruck, C.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Galindo, D.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Gallozzi, S.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

García López, R. J.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Garczarczyk, M.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Gasparyan, S.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Gaug, M.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Giammaria, P.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Godinović, N.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Guberman, D.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Hadasch, D.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Hahn, A.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Hassan, T.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Herrera, J.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Hoang, J.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Hrupec, D.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Inoue, S.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Ishio, K.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Iwamura, Y.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Kubo, H.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Kushida, J.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Kuveždić, D.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Lamastra, A.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Lelas, D.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Leone, F.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Lindfors, E.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Lombardi, S.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Longo, F.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

López, M.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

López-Oramas, A.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Machado de Oliveira Fraga, B.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Maggio, C.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Majumdar, P.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Makariev, M.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Mallamaci, M.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Maneva, G.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Manganaro, M.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Mannheim, K.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Maraschi, L.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Mariotti, M.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Martínez, M.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Masuda, S.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Mazin, D.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Minev, M.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Miranda, J. M.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Mirzoyan, R.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Molina, E.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Moralejo, A.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Moreno, V.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Moretti, E.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Munar-Adrover, P.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Neustroev, V.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Niedzwiecki, A.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Nievas Rosillo, M.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Nigro, C.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Nilsson, K.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Ninci, D.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Nishijima, K.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Noda, K.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Nogués, L.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Nöthe, M.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Paiano, S.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Palacio, J.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Paneque, D.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Paoletti, R.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Paredes, J. M.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Pedaletti, G.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Peñil, P.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Peresano, M.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Persic, M.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Prada Moroni, P. G.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Prandini, E.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Puljak, I.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Garcia, J. R.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Rhode, W.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Ribó, M.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Rico, J.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Righi, C.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Rugliancich, A.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Saha, L.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Sahakyan, N.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Saito, T.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Satalecka, K.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Schweizer, T.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Sitarek, J.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Šnidarić, I.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Sobczynska, D.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Somero, A.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Stamerra, A.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Strzys, M.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Surić, T.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Tavecchio, F.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Temnikov, P.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Terzić, T.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Teshima, M.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Torres-Albà, N.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Tsujimoto, S.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

van Scherpenberg, J.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Vanzo, G.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Vazquez Acosta, M.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Vovk, I.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Will, M.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Zarić, D.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

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Citation

The VERITAS Collaboration, MAGIC Collaboration, Abeysekara, A. U., Benbow, W., Bird, R., Brill, A., et al. (2018). Periastron Observations of TeV Gamma-Ray Emission from a Binary System with a 50-year Period. Astrophysical Journal Letters, (867), 19. Retrieved from https://publications.mppmu.mpg.de/?action=search&mpi=MPP-2018-379.

Cite as: https://hdl.handle.net/21.11116/0000-0003-F865-4

Abstract

We report on observations of the pulsar / Be star binary system PSR J2032+4127 / MT91 213 in the energy range between 100 GeV and 20 TeV with the VERITAS and MAGIC imaging atmospheric Cherenkov telescope arrays. The binary orbit has a period of approximately 50 years, with the most recent periastron occurring on 2017 November 13. Our observations span from 18 months prior to periastron to one month after. A new, point-like, gamma-ray source is detected, coincident with the location of PSR J2032+4127 / MT91 213. The gamma-ray light curve and spectrum are well-characterized over the periastron passage. The flux is variable over at least an order of magnitude, peaking at periastron, thus providing a firm association of the TeV source with the pulsar / Be star system. Observations prior to periastron show a cutoff in the spectrum at an energy around 0.5 TeV. This result adds a new member to the small population of known TeV binaries, and it identifies only the second source of this class in which the nature and properties of the compact object are firmly established. We compare the gamma-ray results with the light curve measured with the X-ray Telescope (XRT) on board the Neil Gehrels \textit{Swift} Observatory and with the predictions of recent theoretical models of the system. We conclude that significant revision of the models is required to explain the details of the emission we have observed, and we discuss the relationship between the binary system and the overlapping steady extended source, TeV J2032+4130.