Results 71 to 80 of about 120,893 (256)

The optical and NIR spectrum of the Crab pulsar with X-shooter [PDF]

open access: yesAstronomy & Astrophysics, 2019
Context. Pulsars are well studied all over the electromagnetic spectrum, and the Crab pulsar may be the most studied object in the sky. Nevertheless, a high-quality optical to near-infrared (NIR) spectrum of the Crab or any other pulsar has not been ...
J. Sollerman   +4 more
semanticscholar   +1 more source

On Possible Reduction of Equilibrium Radius of a Neutron Star Influenced by Superstrong Magnetic Field

open access: yesAdvances in High Energy Physics, Volume 2012, Issue 1, 2012., 2012
Necessary condition for β‐decay suppression of a neutron in degenerate magnetized electron gas is formulated. Based on this, it is shown that, in superstrong magnetic field, equilibrium radius of a neutron star is approximately several times smaller than without the field influence. Therefore, we can make a prediction that in short‐period pulsars, such
Vladimir V. Skobelev, C. Q. Geng
wiley   +1 more source

The specifics of pulsar radio emission

open access: yesOpen Astronomy, 2022
A characteristic property of pulsars is pulsed periodic radio emission, which has a high stability of periods. Despite the high stability of the emission periods of pulsars, monitoring the time of arrival of pulses (timing) shows the presence of ...
Losovsky Boris Ya.
doaj   +1 more source

Pulsar‐Driven Jets in Supernovae, Gamma‐Ray Bursts, and the Universe

open access: yesAdvances in Astronomy, Volume 2012, Issue 1, 2012., 2012
The bipolarity of Supernova 1987A can be understood through its very early light curve from the CTIO 0.4 m telescope and IUE FES and following speckle observations of the “Mystery Spot”. These indicate a beam/jet of light/particles, with initial collimation factors >104 and velocities >0.95 c, involving up to 10−5 M⊙ interacting with circumstellar ...
John Middleditch   +1 more
wiley   +1 more source

The 1997 event in the Crab pulsar revisited [PDF]

open access: yesMonthly Notices of the Royal Astronomical Society, 2010
5 pages 4 figs Accepted by ...
Andrew Lyne   +2 more
openaire   +3 more sources

Constraining Lorentz Invariance Violation Using the Crab Pulsar Emission Observed up to TeV Energies by MAGIC [PDF]

open access: yes, 2017
Spontaneous breaking of Lorentz symmetry at energies on the order of the Planck energy or lower is predicted by many quantum gravity theories, implying non-trivial dispersion relations for the photon in vacuum.
M. L. Ahnen   +244 more
semanticscholar   +1 more source

Bursts of the Crab Nebula gamma-ray emission at high and ultra-high energies

open access: yesEPJ Web of Conferences, 2017
Characteristics of the flares of gamma rays detected from the Crab Nebula by the AGILE and Fermi-LAT satellite instruments are compared with those of a gamma ray burst recorded by several air shower arrays on February 23, 1989 and with one recent ...
Lidvansky A.S.
doaj   +2 more sources

Focusing X‐Ray Optics for Astronomy

open access: yesX-Ray Optics and Instrumentation, Volume 2010, Issue 1, 2010., 2010
Focusing X‐ray telescopes have been the most important factor in X‐ray astronomy’s ascent to equality with optical and radio astronomy. They are the prime tool for studying thermal emission from very high temperature regions, non‐thermal synchrotron radiation from very high energy particles in magnetic fields and inverse Compton scattering of lower ...
Paul Gorenstein, Stephen L. O′Dell
wiley   +1 more source

Teraelectronvolt pulsed emission from the Crab pulsar detected by MAGIC [PDF]

open access: yes, 2015
Aims. We investigate the extension of the very high-energy spectral tail of the Crab Pulsar at energies above 400 GeV. Methods. We analyzed ~320 h of good-quality Crab data obtained with the MAGIC telescope from February 2007 to April 2014. Results. We
M. C. S. Ansoldi   +260 more
semanticscholar   +1 more source

NICER observations of the Crab pulsar glitch of 2017 November [PDF]

open access: yesAstronomy & Astrophysics, 2019
Context. The Crab pulsar underwent its largest timing glitch on 2017 Nov. 8. The event was discovered at radio wavelengths, and was followed at soft X-ray energies by observatories, such as XPNAV and NICER. Aims.
M. Vivekanand
semanticscholar   +1 more source

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