Detection of the Geminga pulsar with MAGIC hints at a power-law tail emission beyond 15 GeV

Journal
Date Issued
2020
Author(s)
MAGIC Collaboration
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Acciari, V. A.
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Ansoldi, S.
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Arbet Engels, A.
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Asano, K.
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Baack, D.
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Babić, A.
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Baquero, A.
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Barres de Almeida, U.
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Barrio, J. A.
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Becerra González, J.
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Bednarek, W.
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Bellizzi, L.
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Bernardini, E.
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Bernardos, M.
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Berti, A.
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Besenrieder, J.
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Bhattacharyya, W.
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Biland, A.
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Blanch, O.
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Bošnjak, Ž.
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Busetto, G.
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Carosi, R.
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Ceribella, G.
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Cerruti, M.
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Chai, Y.
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Chilingarian, A.
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Cikota, S.
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Colak, S. M.
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Colombo, E.
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Contreras, J. L.
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Cortina, J.
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D'Amico, G.
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D'ELIA, Valerio
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•
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de Angelis, A.
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de Lotto, B.
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Delfino, M.
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Delgado, J.
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Delgado Mendez, C.
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Depaoli, D.
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di Girolamo, T.
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di Pierro, F.
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di Venere, L.
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Do Souto Espiñeira, E.
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Dominis Prester, D.
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Dorner, D.
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Doro, M.
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Elsaesser, D.
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Fallah Ramazani, V.
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Fattorini, A.
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Ferrara, G.
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Fonseca, M. V.
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Font, L.
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Fruck, C.
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Fukami, S.
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García López, R. J.
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Garczarczyk, M.
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Gasparyan, S.
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Gaug, M.
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Giglietto, N.
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Giordano, F.
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Gliwny, P.
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Godinović, N.
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Green, D.
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Hadasch, D.
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Hahn, A.
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Heckmann, L.
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Herrera, J.
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Hoang, J.
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Hrupec, D.
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Hütten, M.
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Inada, T.
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Inoue, S.
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Ishio, K.
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Iwamura, Y.
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Jormanainen, J.
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Jouvin, L.
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Kajiwara, Y.
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Karjalainen, M.
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Kerszberg, D.
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Kobayashi, Y.
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Kubo, H.
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Kushida, J.
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Lelas, D.
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Lindfors, E.
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Longo, F.
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López-Coto, R.
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López-Moya, M.
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López-Oramas, A.
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Loporchio, S.
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Machado de Oliveira Fraga, B.
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Maggio, C.
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Majumdar, P.
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Makariev, M.
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Mallamaci, M.
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Maneva, G.
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Manganaro, M.
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Mannheim, K.
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Maraschi, L.
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Mariotti, M.
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Martínez, M.
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Mazin, D.
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Mender, S.
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Mićanović, S.
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Miceli, D.
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Miener, T.
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Minev, M.
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Miranda, J. M.
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Mirzoyan, R.
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Molina, E.
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Moralejo, A.
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Morcuende, D.
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Moreno, V.
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Moretti, E.
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Munar-Adrover, P.
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Neustroev, V.
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Nigro, C.
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Nilsson, K.
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Ninci, D.
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Nishijima, K.
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Noda, K.
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Nozaki, S.
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Ohtani, Y.
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Oka, T.
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Otero-Santos, J.
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Palatiello, M.
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Paneque, D.
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Paoletti, R.
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Paredes, J. M.
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Pavletić, L.
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Peñil, P.
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Perennes, C.
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Prada Moroni, P. G.
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Priyadarshi, C.
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Puljak, I.
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Rhode, W.
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Ribó, M.
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Rico, J.
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Rugliancich, A.
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Saha, L.
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Sahakyan, N.
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Saito, T.
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Sakurai, S.
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Satalecka, K.
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Schleicher, B.
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Schmidt, K.
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Schweizer, T.
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Sitarek, J.
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Šnidarić, I.
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Sobczynska, D.
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Spolon, A.
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Strom, D.
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Strzys, M.
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Suda, Y.
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Surić, T.
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Takahashi, M.
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Temnikov, P.
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Terzić, T.
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Teshima, M.
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Torres-Albà, N.
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Tosti, L.
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Truzzi, S.
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van Scherpenberg, J.
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Vanzo, G.
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Vazquez Acosta, M.
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Ventura, S.
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Verguilov, V.
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Vigorito, C. F.
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Vitale, V.
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Vovk, I.
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Will, M.
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Zarić, D.
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Hirotani, K.
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Saz Parkinson, P. M.
DOI
Abstract
We report the detection of pulsed gamma-ray emission from the Geminga pulsar (PSR J0633+1746) between 15 GeV and 75 GeV. This is the first time a middle-aged pulsar has been detected up to these energies. Observations were carried out with the MAGIC telescopes between 2017 and 2019 using the low-energy threshold Sum-Trigger-II system. After quality selection cuts, ∼80 h of observational data were used for this analysis. To compare with the emission at lower energies below the sensitivity range of MAGIC, 11 years of Fermi-LAT data above 100 MeV were also analysed. From the two pulses per rotation seen by Fermi-LAT, only the second one, P2, is detected in the MAGIC energy range, with a significance of 6.3σ. The spectrum measured by MAGIC is well-represented by a simple power law of spectral index Γ = 5.62 ± 0.54, which smoothly extends the Fermi-LAT spectrum. A joint fit to MAGIC and Fermi-LAT data rules out the existence of a sub-exponential cut-off in the combined energy range at the 3.6σ significance level. The power-law tail emission detected by MAGIC is interpreted as the transition from curvature radiation to Inverse Compton Scattering of particles accelerated in the northern outer gap.
Volume
643
Start page
L14
Uri
Url
Issn Identifier
0004-6361
Ads BibCode
2020A&A...643L..14M
Rights
open.access
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