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200 papers

Observational data imply the presence of superluminal electric currents in pulsar magnetospheres. Such sources are not inconsistent with special relativity; they have already been created in the laboratory. Here we describe the distinctive…

Solar and Stellar Astrophysics · Physics 2009-03-04 Houshang Ardavan , Arzhang Ardavan , Joseph Fasel , John Middleditch , Mario Perez , Andrea Schmidt , John Singleton

The linear polarisation of the Crab pulsar and its close environment was derived from observations with the high-speed photo-polarimeter OPTIMA at the 2.56-m Nordic Optical Telescope in the optical spectral range (400 - 750 nm). Time…

Solar and Stellar Astrophysics · Physics 2009-06-12 Agnieszka Słowikowska , Gottfried Kanbach , Michael Kramer , Alexander Stefanescu

We have examined the cyclotron resonance instability developing in the relativistic out-flowing plasma in the pulsar magnetosphere. The instability condition leads to radio emission in the sub-GHz frequency regime which is likely to be seen…

High Energy Astrophysical Phenomena · Physics 2015-06-16 Rahul Basu , Dipanjan Mitra , George I. Melikidze

The Crab pulsar experienced a major flare in 2010 as observed by Fermi LAT. Observations by the Hubble Space Telescope indicate that the flare was accompanied by a structural change in the anvil region of the Crab Nebula. In the framework…

High Energy Astrophysical Phenomena · Physics 2011-11-03 N. Lewandowska , C. Wendel , V. Kondratiev , D. Elsässer , K. Mannheim

The frequency dependence of normal pulsar radio emission is typically observed to be a power law, with some indications of a flattening or turnover at low frequencies ($<100$ MHz). The spectrum of the Crab pulsar's giant pulse emission has…

High Energy Astrophysical Phenomena · Physics 2018-07-13 B. W. Meyers , S. E. Tremblay , N. D. R. Bhat , R. M. Shannon

Pulsar glitches are attributed to the sudden re-coupling of very weakly coupled large scale superfluid components in the neutron star interior. This process leads to rapid exchange of angular momentum and an increase in spin frequency. The…

High Energy Astrophysical Phenomena · Physics 2020-12-22 Brynmor Haskell , Vadym Khomenko , Marco Antonelli , Danai Antonopoulou

We present a study of shape, spectra and polarization properties of giant pulses (GPs) from the Crab pulsar at the very high frequencies of 8.5 and 15.1 GHz. Studies at 15.1 GHz were performed for the first time. Observations were conducted…

The Crab Pulsar is the prime example of an emitter of giant pulses. These short, very bright pulses are thought to originate near the light cylinder, at $\sim\!1600{\rm\;km}$ from the pulsar. The pulsar's location inside the Crab Nebula…

High Energy Astrophysical Phenomena · Physics 2023-03-29 Rebecca Lin , Marten H. van Kerkwijk , Robert Main , Nikhil Mahajan , Ue-Li Pen , Franz Kirsten

Simultaneous dual-frequency observations of giant pulses from the Crab pulsar were performed at the frequencies of 61 and 111 MHz. It is shown that scattering of giant pulses from the Crab pulsar occurs at thick, and not at thin screen.

Astrophysics · Physics 2007-09-13 Alexander A. Ershov

Giant pulses (GPs) are extremely bright individual pulses of radio pulsar. In microbursts of Crab pulsar, which is an active GP emitter, zebra-pattern-like spectral structures are observed, which are reminiscent of the `zebra bands' that…

High Energy Astrophysical Phenomena · Physics 2018-11-28 Weiyang Wang , Jiguang Lu , Songbo Zhang , Xuelei Chen , Rui Luo , Renxin Xu

In this Letter we propose that coherent radio emission of Crab, other young energetic pulsars, and millisecond pulsars is produced in the magnetospheric current sheet beyond the light cylinder. We carry out global and local two-dimensional…

High Energy Astrophysical Phenomena · Physics 2019-05-01 Alexander Philippov , Dmitri A. Uzdensky , Anatoly Spitkovsky , Benoît Cerutti

Radio observations from normal pulsars indicate that the coherent radio emission is excited by curvature radiation from charge bunches. In this review we provide a systematic description of the various observational constraints on the radio…

High Energy Astrophysical Phenomena · Physics 2024-06-03 Dipanjan Mitra , Rahul Basu , George I Melikizde

We report observations of Crab giant pulses made with the Australia Telescope Compact Array and a baseband recorder system, made simultaneously at two frequencies, 1300 and 1470 MHz. These observations were sensitive to pulses with…

Astrophysics · Physics 2009-11-13 N. D. Ramesh Bhat , Steven J. Tingay , Haydon S. Knight

We investigate the use of bright single pulses from the Crab pulsar to determine separately the dispersion measure (DM) for the Main Pulse and Interpulse components. We develop two approaches using cross correlation functions (CCFs). The…

Solar and Stellar Astrophysics · Physics 2022-08-31 N. Lewandowska , P. B. Demorest , M. A. McLaughlin , P. Kilian , T. H. Hankins

We present four new, high-resolution VLA radio images of the Crab nebula, taken between 2001 Feb. and Apr. The radio images show systematic variability in the Crab's radio emission throughout the region near the pulsar. The principal…

Astrophysics · Physics 2009-11-10 M. F. Bietenholz , J. J. Hester , D. A. Frail , N. Bartel

It is shown that pulsar radio emission can be generated effectively through a streaming motion in the polar-cap regions of a pulsar magnetosphere causing nonresonant growth of waves that can escape directly. As in other beam models, a…

Astrophysics · Physics 2009-11-07 M. Gedalin , E. Gruman , D. B. Melrose

For comprehensive studying of giant pulses (GPs) from the Crab pulsar and the original millisecond pulsar (MSP) B1937+21 (J1939+2134), we conducted multifrequency observations over the last few years. They show that giant pulses may be…

Astrophysics · Physics 2007-05-23 V. Soglasnov

The Crab pulsar emits across a large part of the electromagnetic spectrum. Determining the time delay between the emission at different wavelengths will allow to better constrain the site and mechanism of the emission. We have…

We present analysis of the rate of giant radio pulses (GPs) emission from the Crab pulsar (B0531+21). Results of our 9 years daily observations with the Large Phased Array radio telescope of Pushchino Radio Astronomy Observatory at 111 MHz…

High Energy Astrophysical Phenomena · Physics 2020-05-19 A. N. Kazantsev , V. A. Potapov , M. S. Pshirkov , B. Ya. Losovskii