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arxiv: 1109.6124 · v4 · submitted 2011-09-28 · 🌌 astro-ph.HE

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Phase-resolved energy spectra of the Crab Pulsar in the range of 50-400 GeV measured with the MAGIC Telescopes

MAGIC Collaboration: J. Aleksi\'c (1) , E. A. Alvarez (2) , L. A. Antonelli (3) , P. Antoranz (4) , M. Asensio (2) , M. Backes (5) , J. A. Barrio (2) , D. Bastieri (6)
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J. Becerra Gonz\'alez (7 8) W. Bednarek (9) A. Berdyugin (10) K. Berger (7 E. Bernardini (11) A. Biland (12) O. Blanch (1) R. K. Bock (13) A. Boller (12) G. Bonnoli (3) D. Borla Tridon (13) I. Braun (12) T. Bretz (14 26) A. Ca\~nellas (15) E. Carmona (13) A. Carosi (3) P. Colin (13) E. Colombo (7) J. L. Contreras (2) J. Cortina (1) L. Cossio (16) S. Covino (3) F. Dazzi (16 27) A. De Angelis (16) G. De Caneva (11) E. de Cea del Pozo (17) B. De Lotto (16) C. Delgado Mendez (7 28) A. Diago Ortega (7 M. Doert (5) A. Dom\'inguez (18) D. Dominis Prester (19) D. Dorner (12) M. Doro (20) D. Eisenacher (14) D. Elsaesser (14) D. Ferenc (19) M. V. Fonseca (2) L. Font (20) C. Fruck (13) R. J. Garc\'ia L\'opez (7 M. Garczarczyk (7) D. Garrido (20) G. Giavitto (1) N. Godinovi\'c (19) D. Hadasch (17) D. H\"afner (13) A. Herrero (7 D. Hildebrand (12) D. H\"ohne-M\"onch (14) J. Hose (13) D. Hrupec (19) T. Jogler (13) H. Kellermann (13) S. Klepser (1) T. Kr\"ahenb\"uhl (12) J. Krause (13) J. Kushida (13) A. La Barbera (3) D. Lelas (19) E. Leonardo (4) N. Lewandowska (14) E. Lindfors (10) S. Lombardi (6) M. L\'opez (2) A. L\'opez-Oramas (1) E. Lorenz (12 13) M. Makariev (21) G. Maneva (21) N. Mankuzhiyil (16) K. Mannheim (14) L. Maraschi (3) M. Mariotti (6) M. Mart\'inez (1) D. Mazin (1 M. Meucci (4) J. M. Miranda (4) R. Mirzoyan (13) J. Mold\'on (15) A. Moralejo (1) P. Munar-Adrover (15) A. Niedzwiecki (9) D. Nieto (2) K. Nilsson (10 29) N. Nowak (13) R. Orito (13) D. Paneque (13) R. Paoletti (4) S. Pardo (2) J. M. Paredes (15) S. Partini (4) M. A. Perez-Torres (1) M. Persic (16 22) L. Peruzzo (6) M. Pilia (23) J. Pochon (7) F. Prada (18) P. G. Prada Moroni (24) E. Prandini (6) I. Puerto Gimenez (7) I. Puljak (19) I. Reichardt (1) R. Reinthal (10) W. Rhode (5) M. Rib\'o (15) J. Rico (25 1) S. R\"ugamer (14) A. Saggion (6) K. Saito (13) T. Y. Saito (13) M. Salvati (3) K. Satalecka (2) V. Scalzotto (6) V. Scapin (2) C. Schultz (6) T. Schweizer (13) M. Shayduk (13) S. N. Shore (24) A. Sillanp\"a\"a (10) J. Sitarek (9) I. Snidaric (19) D. Sobczynska (9) F. Spanier (14) S. Spiro (3) V. Stamatescu (1) A. Stamerra (4) B. Steinke (13) J. Storz (14) N. Strah (5) T. Suri\'c (19) L. Takalo (10) H. Takami (13) F. Tavecchio (3) P. Temnikov (21) T. Terzi\'c (19) D. Tescaro (24) M. Teshima (13) O. Tibolla (14) D. F. Torres (25 17) A. Treves (23) M. Uellenbeck (5) H. Vankov (21) P. Vogler (12) R. M. Wagner (13) Q. Weitzel (12) V. Zabalza (15) F. Zandanel (18) R. Zanin (1) K. Hirotani (30) ((1) IFAE Edifici Cn. Campus UAB Bellaterra Spain (2) Universidad Complutense Madrid (3) INAF National Institute for Astrophysics Rome Italy (4) Universit\`a di Siena INFN Pisa Siena (5) Technische Universit\"at Dortmund Dortmund Germany (6) Universit\`a di Padova INFN Padova (7) Inst. de Astrof\'isica de Canarias La Laguna Tenerife (8) Depto. de Astrof\'isica Universidad de La Laguna (9) University of \L\'od\'z Lodz Poland (10) Tuorla Observatory University of Turku Piikki\"o Finland (11) Deutsches Elektronen-Synchrotron (DESY) Zeuthen (12) ETH Zurich Zurich Switzerland (13) Max-Planck-Institut f\"ur Physik M\"unchen (14) Universit\"at W\"urzburg W\"urzburg (15) Universitat de Barcelona (ICC/IEEC) Barcelona (16) Universit\`a di Udine INFN Trieste Udine (17) Institut de Ci\`encies de l'Espai (IEEC-CSIC) (18) Inst. de Astrof\'isica de Andaluc\'ia (CSIC) Granada (19) Croatian MAGIC Consortium Rudjer Boskovic Institute University of Rijeka University of Split Zagreb Croatia (20) Universitat Aut\`onoma de Barcelona (21) Inst. for Nucl. Research Nucl. Energy Sofia Bulgaria (22) INAF/Osservatorio Astronomico Trieste (23) Universit\`a dell'Insubria Como (24) Universit\`a di Pisa Pisa (25) ICREA (26) now at: Ecole polytechnique f\'ed\'erale de Lausanne (EPFL) Lausanne (27) supported by INFN Padova (28) now at: Centro de Investigaciones Energ\'eticas Medioambientales y Tecnol\'ogicas (CIEMAT) (29) now at: Finnish Centre for Astronomy with ESO (FINCA) Finland (30) ASIAA/National Tsing Hua University-TIARA Taipei Taiwan)
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classification 🌌 astro-ph.HE
keywords spectracrabenergymagicpulsarrangedataemission
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We use 73 h of stereoscopic data taken with the MAGIC telescopes to investigate the very high-energy (VHE) gamma-ray emission of the Crab pulsar. Our data show a highly significant pulsed signal in the energy range from 50 to 400 GeV in both the main pulse (P1) and the interpulse (P2) phase regions. We provide the widest spectra to date of the VHE components of both peaks, and these spectra extend to the energy range of satellite-borne observatories. The good resolution and background rejection of the stereoscopic MAGIC system allows us to cross-check the correctness of each spectral point of the pulsar by comparison with the corresponding (strong and well-known) Crab nebula flux. The spectra of both P1 and P2 are compatible with power laws with photon indices of 4.0 \pm 0.8 (P1) and 3.42 \pm 0.26 (P2), respectively, and the ratio P1/P2 between the photon counts of the two pulses is 0.54 \pm 0.12. The VHE emission can be understood as an additional component produced by the inverse Compton scattering of secondary and tertiary e\pm pairs on IR-UV photons.

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