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200 papers

The Crab Nebula demonstrates that neutron stars can interact with their environments in spectacular fashion, their relativistic winds generating nebulae observable across the electromagnetic spectrum. At many previous conferences,…

Astrophysics · Physics 2007-05-23 Bryan M. Gaensler

It was previously believed that, the long-term persistent increase in the spin-down rate of the Crab pulsar following a glitch is direct evidence of a starquake-induced glitch or at least related to a starquake. Using radio data covering…

High Energy Astrophysical Phenomena · Physics 2025-04-01 Xiao-Ping Zheng , Wei-Hua Wang , Chun Huang , Jian-Ping Yuan , Sheng-Jie Yuan

The evolutions of a neutron star's rotation and magnetic field (B-field) have remained unsolved puzzles for over half a century. We ascribe the rotational braking torques of pulsar to both components, the standard magnetic dipole radiation…

High Energy Astrophysical Phenomena · Physics 2022-12-12 Cheng-Min Zhang , Xiang-Han Cui , Di Li , De-Hua Wang , Shuang-Qiang Wang , Na Wang , Jian-Wei Zhang , Bo Peng , Wei-Wei Zhu , Yi-Yan Yang , Yuan-Yue Pan

A model for the main observational characteristics of the radio emission of pulsars with well organized drifting subpulses is presented. We propose that drifting subpulses result from the modulation of the radio emission mechanism due to…

Astrophysics · Physics 2009-11-10 G. Gogoberidze , G. Z. Machabeli , D. Melrose , Q. Luo

We present new data of the Crab pulsar and its environment. Images taken in the infrared with ISAAC allow us to measure the pulsar spectrum and to reveal the red knot close to the pulsar. Complementary optical data from VLT and HST are…

Astrophysics · Physics 2007-05-23 Jesper Sollerman , Veronica Flyckt

In the present paper a self-consistent theory, interpreting the VERITAS observations of the very high energy pulsed emission from the Crab pulsar is considered. The photon spectrum between 10MeV and 400GeV can be described by two power-law…

High Energy Astrophysical Phenomena · Physics 2012-08-13 Nino Chkheidze , George Machabeli , Zaza Osmanov

We study dynamics of drift waves in the pair plasma of pulsar magnetosphere. It is shown that nonlinear of the drift waves with plasma particles leads to the formation of small scale structures. We show that cyclotron instability developed…

High Energy Astrophysical Phenomena · Physics 2017-12-15 G. Machabeli , I. Malov , G. Gogoberidze

Observations of pulsar glitches remain a powerful tool for studying the interior of neutron stars. Many of the observed glitch properties are shown to result from the evolution of glitches in the different manifestations of neutron stars.…

High Energy Astrophysical Phenomena · Physics 2013-04-17 J. O. Urama , B. C. Joshi , A. E. Chukwude

We discuss growing evidence that pulsar high energy is emission is generated via Inverse Compton mechanism. We reproduce the broadband spectrum of Crab pulsar, from UV to very high energy gamma-rays - nearly ten decades in energy, within…

High Energy Astrophysical Phenomena · Physics 2015-06-11 Maxim Lyutikov

We present evidence of wavelength-dependent variations within the infrared, optical, and ultraviolet pulse profile peaks of the Crab Nebula pulsar. The leading and trailing edge half-width half-maxima of the peaks display clear differences…

There are now a half dozen young pulsars detected in high energy photons by the Compton GRO, showing a variety of emission efficiencies and pulse profiles. We present here a calculation of the pattern of high energy emission on the sky in a…

Astrophysics · Physics 2009-10-22 Roger W. Romani , I. -A. Yadigaroglu

The Crab pulsar and its nebula are among the most studied astrophysical systems, and constitute one of the most promising environments where high energy processes and particle acceleration can be investigated. They are the only objects for…

High Energy Astrophysical Phenomena · Physics 2022-08-02 Niccolò Bucciantini , Riccardo Ferrazzoli , Matteo Bachetti , John Rankin , Niccolò Di Lalla , Carmelo Sgrò , Nicola Omodei , Takao Kitaguchi , Tsunefumi Mizuno , Shuichi Gunji , Eri Watanabe , Luca Baldini , Patrick Slane , Martin C. Weisskopf , Roger W. Romani , Andrea Possenti , Herman L. Marshall , Stefano Silvestri , Luigi Pacciani , Michela Negro , Fabio Muleri , Emma de Oña Wilhelmi , Fei Xie , Jeremy Heyl , Melissa Pesce-Rollins , Josephine Wong , Maura Pilia , Ivan Agudo , Lucio A. Antonelli , Wayne H. Baumgartner , Ronaldo Bellazzini , Stefano Bianchi , Stephen D. Bongiorno , Raffaella Bonino , Alessandro Brez , Fiamma Capitanio , Simone Castellano , Elisabetta Cavazzuti , Stefano Ciprini , Enrico Costa , Alessandra De Rosa , Ettore Del Monte , Laura Di Gesu , Alessandro Di Marco , Immacolata Donnarumma , Victor Doroshenko , Michal Dovčiak , Steven R. Ehlert , Teruaki Enoto , Yuri Evangelista , Sergio Fabiani , Javier A. Garcia , Kiyoshi Hayashida , Wataru Iwakiri , Svetlana G. Jorstad , Vladimir Karas , Jeffery J. Kolodziejczak , Henric Krawczynski , Fabio La Monaca , Luca Latronico , Ioannis Liodakis , Simone Maldera , Alberto Manfreda , Frédéric Marin , Andrea Marinucci , Alan P. Marscher , Francesco Massaro , Giorgio Matt , Ikuyuki Mitsuishi , C. -Y. Ng , Stephen L. O'Dell , Chiara Oppedisano , Alessandro Papitto , George G. Pavlov , Abel L. Peirson , Matteo Perri , Pierre-Olivier Petrucci , Juri Poutanen , Simonetta Puccetti , Brian D. Ramsey , Ajay Ratheesh , Paolo Soffitta , Gloria Spandre , Toru Tamagawa , Fabrizio Tavecchio , Roberto Taverna , Yuzuru Tawara , Allyn F. Tennant , Nicolas E. Thomas , Francesco Tombesi , Alessio Trois , Sergey Tsygankov , Roberto Turolla , Jacco Vink , Kinwah Wu , Silvia Zane

Pulsar radio emission is modelled as a sum of two completely polarized non-orthogonal modes with the randomly varying Stokes parameters and intensity ratio. The modes are the result of polarization evolution of the original natural waves in…

Astrophysics · Physics 2009-11-11 S. A. Petrova

The well-observed Crab pulsar helps one to uncover the underlying knowledge about pulsar evolution. The routine evolution model simultaneously describes the spin-down caused by the magnetic dipole radiation (MDR) and gravitational wave…

High Energy Astrophysical Phenomena · Physics 2026-05-13 Cong-Xing Liu , Jian-Min Dong

The Crab pulsar is the only astronomical pulsed source detected above 100 GeV. The emission mechanism of very high energy gamma-ray pulsation is not yet fully understood, although several theoretical models have been proposed. In order to…

High Energy Astrophysical Phenomena · Physics 2019-08-14 T. Y. Saito , S. Bonnefoy , K. Hirotani , R. Zanin

We constructed the magnetic field oscillation model (hereafter the MO model) by analogizing the periodically reversing phenomenon of the solar magnetic field to pulsars. Almost all kinds of pulsar radiation phenomena are best explained…

Astrophysics · Physics 2017-09-14 Zhu-Xing Liang , Yi Liang

The radiation of pulsars have been observed for many years. A few pulsars are discovered to have both radio and gamma-ray emission. Many models on pulsar radiation have been developed, but so far we are still lacking an elaborate model…

Astrophysics · Physics 2009-09-29 G. J. Qiao , K. J. Lee , H. G. Wang , R. X. Xu

Interpretation of the recently discovered very high energy (VHE) pulsed emission from the Crab pulsar is presented. By taking into account the fact that Crab pulsar's radiation for the optical and VHE spectrum peak at the same phases, we…

High Energy Astrophysical Phenomena · Physics 2009-08-10 Machabeli George , Osmanov Zaza

The study of pulsars in the three and a half decades since their discovery has highlighted a handful of issues critical to their understanding. To date there is no consensus on the physical mechanism for their radio radio emission, despite…

Astrophysics · Physics 2009-11-10 Matthew G. Baring

The pulsar wind model is updated by considering the effect of particle density and pulsar death. It can describe both the short term and long term rotational evolution of pulsars consistently. It is applied to model the rotational evolution…

High Energy Astrophysical Phenomena · Physics 2015-06-23 F. F. Kou , H. Tong