Results 61 to 70 of about 108,919 (255)
The optical and NIR spectrum of the Crab pulsar with X-shooter [PDF]
Astronomy & 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
Advances 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 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
Spectroscopy of the Crab Pulsar [PDF]
Astronomy & Astrophysics, 2001 We present new, high signal-to-noise spectroscopy of the Crab Pulsar in the range 5000 7000 A. The observations were carried out with the 6-meter telescope of the SAO with the spectrograph SP-124 with a resolution of 2 A. After reduction of the Crab Nebula emission, the dereddened pulsar spectrum can be tted by ap ower law with = 0:15 0:15.
G. M. Beskin, V. V. Neustroev
openaire +1 more source
Pulsar‐Driven Jets in Supernovae, Gamma‐Ray Bursts, and the Universe
Advances 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
Radio emission physics in the Crab pulsar [PDF]
Journal of Plasma Physics, 2016 We review our high-time-resolution radio observations of the Crab pulsar and compare our data to a variety of models for the emission physics. The Main Pulse and the Low Frequency Interpulse come from regions somewhere in the high-altitude emission zones (caustics) that also produce pulsed X-ray and${\it\gamma}$-ray emission. Although no emission model
Eilek, J. A., Hankins, T. H.
openaire +3 more sources
NICER observations of the Crab pulsar glitch of 2017 November [PDF]
Astronomy & 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
Focusing X‐Ray Optics for Astronomy
X-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
The Crab Nebula flaring activity
Physics Letters B, 2014 The discovery made by AGILE and Fermi of a short time scale flaring activity in the gamma-ray energy emission of the Crab Nebula is a puzzling and unexpected feature, challenging particle acceleration theory.
G. Montani, M.G. Bernardini
doaj +1 more source
The Dark Matter Annihilation Signal from Dwarf Galaxies and Subhalos
Advances in Astronomy, Volume 2010, Issue 1, 2010., 2010 Dark Matter annihilation holds great potential for directly probing the clumpiness of the Galactic halo that is one of the key predictions of the Cold Dark Matter paradigm of hierarchical structure formation. Here we review the γ‐ray signal arising from dark matter annihilation in the centers of Galactic subhalos.
Michael Kuhlen, Andrey V. Kravtsov
wiley +1 more source