Results 11 to 20 of about 120,893 (256)
Shedding new light on the Crab with polarized X-rays [PDF]
Scientific Reports, 2017 Strong magnetic fields, synchrotron emission, and Compton scattering are omnipresent in compact celestial X-ray sources. Emissions in the X-ray energy band are consequently expected to be linearly polarized. X-ray polarimetry provides a unique diagnostic
M. Chauvin +15 more
doaj +2 more sources
Scattering features and variability of the Crab pulsar [PDF]
Monthly Notices of the Royal Astronomical Society, 2018 We report on Westerbork Synthesis Radio Telescope observations of the Crab pulsar at 350 MHz from 2012 November 24 until 2015 June 21. During this period we consistently observe variations in the pulse profile of the Crab. Both variations in the scattering width of the pulse profile as well as delayed copies, also known as echoes, are seen regularly ...
C. G. Bassa +7 more
openaire +7 more sources
The X-ray jet in the Crab Nebula: radical implications for pulsar theory? [PDF]
ApJ 562, 494 (2001), 2002 The recent Chandra image of the Crab nebula shows a striking, axisymmetric polar jet. It is shown that jets are formed in axisymmetric, magnetized pulsar winds and that the jet luminosity scales relative to the total as (\gamma_0\sigma_{eq})^{-4/3}, where \sigma_{eq} is the ratio of Poynting flux to particle kinetic energy output at the equator at the ...
Yuri Lyubarsky, David Eichler
arxiv +3 more sources
International Astronomical Union Colloquium, 2000 AbstractObservations over an eight month period from July 1997 to March 1998 show echoes following the radio pulses, and unusual changes in dispersion measure. We interpret this remarkable and complex event as refraction and dispersion in an ionised shell in the outer part of the Crab Nebula.
F. G. Smith, A. G. Lyne
openalex +3 more sources
POLAR measurements of the Crab pulsar [PDF]
Proceedings of 35th International Cosmic Ray Conference — PoS(ICRC2017), 2017 POLAR is a Compton polarimeter sensitive in the 50 to 500 keV energy range. The Crab pulsar is a scientific target for POLAR on board the Chinese space laboratory Tiangong-2 (TG-2). With its large Field of View (FoV), POLAR detected significant pulsed signals from the Crab pulsar which is visible by POLAR in about half of observation time. In this work,
POLAR collaboration +3 more
openaire +6 more sources
The largest glitch observed in the Crab pulsar [PDF]
Monthly Notices of the Royal Astronomical Society, 2018 We have observed a large glitch in the Crab pulsar (PSR B0531+21). The glitch occurred around MJD 58064 (2017 November 8) when the pulsar underwent an increase in the rotation rate of $ = 1.530 \times 10^{-5}$ Hz, corresponding to a fractional increase of $ / = 0.516 \times 10^{-6}$ making this event the largest glitch ever observed in this ...
Michael Keith +12 more
openaire +6 more sources
Rotational evolution of the Crab pulsar in the wind braking model [PDF]
, 2015 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 of the Crab pulsar. The pulsar is spun down by a combination of magnetic dipole radiation and particle wind.
F. Kou, Hao Tong
arxiv +3 more sources
Multifrequency Radio Observations of the Crab Pulsar [PDF]
The Astrophysical Journal, 1996 13 pages. Source is single LaTeX file with 3 figures, using aaspp and epsf style files (included). To appear in The Astrophysical Journal, September 1996. Paper can also be found at http://www.ee.nmt.edu/
D. A. Moffett, T. H. Hankins
openalex +5 more sources
The Pulsar in the Crab Nebula [PDF]
arXiv, 2015 The Crab pulsar belongs to one of the most studied stellar objects in the sky. Since its accidental detection in 1968, its pulsed emission has been observed throughout most of the electromagnetic spectrum. Although currently one of more than 2000 known pulsars, its way of work has remained not understood making the Crab pulsar an object of continuous ...
arxiv +3 more sources
Searching for gravitational waves from the Crab pulsar - the problem of timing noise [PDF]
Class.Quant.Grav. 21 (2004) S843-S846, 2003 Of the current known pulsars, the Crab pulsar (B0531+21) is one of the most promising sources of gravitational waves. The relatively large timing noise of the Crab causes its phase evolution to depart from a simple spin-down model. This effect needs to be taken in to account when performing time domain searches for the Crab pulsar in order to avoid ...
M. Pitkin, G. Woan
arxiv +3 more sources