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

被引:36
作者
Acciari, V. A. [1 ,2 ]
Ansoldi, S. [3 ,4 ]
Antonelli, L. A. [5 ]
Engels, A. Arbet [6 ]
Asano, K. [7 ]
Baack, D. [8 ]
Babic, A. [9 ]
Baquero, A. [10 ,11 ]
Barres de Almeida, U. [12 ]
Barrio, J. A. [10 ,11 ]
Becerra Gonzalez, J. [1 ,2 ]
Bednarek, W. [13 ]
Bellizzi, L. [14 ,15 ]
Bernardini, E. [16 ]
Bernardos, M. [17 ]
Berti, A. [18 ]
Besenrieder, J. [19 ]
Bhattacharyya, W. [16 ]
Bigongiari, C. [5 ]
Biland, A. [6 ]
Blanch, O. [20 ]
Bonnoli, G. [14 ,15 ]
Bosnjak, Z. [9 ]
Busetto, G. [21 ,22 ]
Carosi, R. [20 ]
Ceribella, G. [19 ]
Cerruti, M. [25 ]
Chai, Y. [19 ]
Chilingarian, A. [26 ]
Cikota, S. [9 ]
Colak, S. M. [20 ]
Colombo, E. [1 ,2 ]
Contreras, J. L. [10 ,11 ]
Cortina, J. [17 ]
Covino, S. [5 ]
D'Amico, G. [19 ]
D'Elia, V. [5 ]
Da Vela, P. [23 ,24 ,42 ]
Dazzi, F. [5 ]
De Angelis, A. [21 ,22 ]
De Lotto, B. [3 ,4 ]
Delfino, M. [20 ,43 ]
Delgado, J. [20 ,43 ]
Delgado Mendez, C. [17 ]
Depaoli, D. [18 ]
Di Girolamo, T. [18 ]
Di Pierro, F. [18 ]
Di Venere, L. [18 ]
Do Souto Espineira, E. [20 ]
Prester, D. Dominis [27 ]
机构
[1] Inst Astrofis Canarias, San Cristobal la Laguna 38200, Spain
[2] Univ La Laguna, Dept Astrofis, San Cristobal la Laguna 38206, Spain
[3] Univ Udine, I-33100 Udine, Italy
[4] INFN Trieste, I-33100 Udine, Italy
[5] Natl Inst Astrophys INAF, I-00136 Rome, Italy
[6] Swiss Fed Inst Technol, CH-8093 Zurich, Switzerland
[7] Univ Tokyo, Japanese MAGIC Grp, Inst Cosm Ray Res ICRR, Kashiwa, Chiba 2778582, Japan
[8] Tech Univ Dortmund, D-44221 Dortmund, Germany
[9] Univ Zagreb, Croatian MAGIC Grp, Fac Elect Engn & Comp FER, Zagreb 10000, Croatia
[10] Univ Complutense Madrid, IPARCOS Inst, Madrid 28040, Spain
[11] Univ Complutense Madrid, EMFTEL Dept, Madrid 28040, Spain
[12] URCA, Ctr Brasileiro Pesquisas Fis, BR-22290180 Rio De Janeiro, RJ, Brazil
[13] Univ Lodz, Fac Phys & Appl Informat, Dept Astrophys, PL-90236 Lodz, Poland
[14] Univ Siena, I-53100 Siena, Italy
[15] INFN Pisa, I-53100 Siena, Italy
[16] Deutsch Elektronen Synchrotron DESY, D-15738 Zeuthen, Germany
[17] Ctr Invest Energet Medioambientales & Tecnol, Madrid 28040, Spain
[18] Ist Nazl Fis Nucl, I-00044 Frascati, Roma, Italy
[19] Max Planck Inst Phys & Astrophys, D-80805 Munich, Germany
[20] Barcelona Inst Sci & Technol BIST, Inst Fis Altes Energies, Bellaterra 08193, Barcelona, Spain
[21] Univ Padua, I-35131 Padua, Italy
[22] Ist Nazl Fis Nucl, I-35131 Padua, Italy
[23] Univ Pisa, I-56126 Pisa, Italy
[24] INFN Pisa, I-56126 Pisa, Italy
[25] Univ Barcelona, ICCUB, IEEC UB, Barcelona 08028, Spain
[26] A Alikhanyan Natl Sci Lab, Armenian MAGIC Grp, Yerevan, Armenia
[27] Univ Rijeka, Dept Phys, Croatian MAGIC Grp, Rijeka 51000, Croatia
[28] Univ Wurzburg, D-97074 Wurzburg, Germany
[29] Univ Turku, Finnish MAGIC Grp, Finnish Ctr Astron ESO, Turku 20014, Finland
[30] Univ Autonoma Barcelona, Dept Fis, Bellaterra 08193, Spain
[31] Univ Autonoma Barcelona, CERES IEEC, Bellaterra 08193, Spain
[32] NAS RA, ICRANet Armenia, Armenian MAGIC Grp, Yerevan, Armenia
[33] Univ Split, Croatian MAGIC Grp, Fac Elect Engn Mech Engn & Naval Architecture FES, Split 21000, Croatia
[34] Josip Juraj Strossmayer Univ Univ Osijek, Dept Phys, Croatian MAGIC Grp, Osijek 31000, Croatia
[35] RIKEN, Japanese MAGIC Grp, Wako, Saitama 3510198, Japan
[36] Kyoto Univ, Japanese MAGIC Grp, Dept Phys, Kyoto 6068502, Japan
[37] Tokai Univ, Dept Phys, Japanese MAGIC Grp, Hiratsuka, Kanagawa 2591292, Japan
[38] HBNI, Saha Inst Nucl Phys, 1-AF Bidhannagar,Sect 1, Kolkata 700064, India
[39] Bulgarian Acad Sci, Inst Nucl Res & Nucl Energy, Sofia 1784, Bulgaria
[40] Univ Oulu, Astron Res Unit, Finnish MAGIC Grp, Oulu 90014, Finland
[41] Rudjer Boskovic Inst, Croatian MAGIC Grp, Zagreb 10000, Croatia
[42] Univ Innsbruck, Innsbruck, Austria
[43] Port Informacio Cient PIC, Bellaterra 08193, Barcelona, Spain
[44] Univ Trieste, Dipartimento Fis, I-34127 Trieste, Italy
[45] Univ Bologna, INAF Trieste, Bologna, Italy
[46] Univ Bologna, Dept Phys & Astron, Bologna, Italy
[47] Acad Sinica, Inst Astron & Astrophys, POB 23-141, Taipei, Taiwan
[48] Univ Hong Kong, Dept Phys, Pok Fu Lam, Pokfulam Rd, Hong Kong, Peoples R China
[49] Univ Hong Kong, Lab Space Res, Pok Fu Lam, Pokfulam Rd, Hong Kong, Peoples R China
[50] Univ Calif Santa Cruz, Santa Cruz Inst Particle Phys, Santa Cruz, CA 95064 USA
基金
芬兰科学院;
关键词
gamma rays: stars; pulsars: general; pulsars: individual: PSR J0633+1746; pulsars: individual: Geminga; GAMMA-RAY PULSARS; MAJOR UPGRADE; X-RAY; TELESCOPES; RADIATION; PARALLAX;
D O I
10.1051/0004-6361/202039131
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
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, similar to 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 6.3 sigma. The spectrum measured by MAGIC is well-represented by a simple power law of spectral index Gamma =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 3.6 sigma 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.
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页数:6
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