Results 51 to 60 of about 120,893 (256)
A new approach to generate a catalogue of potential historical novae
Astronomische Nachrichten, Volume 341, Issue 1, Page 79-98, January 2020., 2020 Abstract Ancient Chinese, Korean, and Vietnamese observers left us records of celestial sightings, the so‐called “guest stars” dated up to ∼2500 years ago. Their identification with modern observable targets could open interesting insights into the long‐term behavior of astronomical objects, as shown by the successful identification of eight galactic ...
Susanne M. Hoffmann +2 more
wiley +1 more source
OSSE Observations of the Crab Pulsar [PDF]
The Astrophysical Journal, 1991 We present results of the Compton Gamma-Ray Observatory (CGRO) Oriented Scintillation Spectrometer Experiment (OSSE) observations of the Crab pulsar, made during MJD 48373-48406 (1991 April 27 - 1991 May 30) and MJD 48798-48804 (1992 June 25 - 1992 July 1). Pulsar light curves and spectra over the approximately 0.05 to 10 MeV range are presented.
Robert A. Cameron +13 more
openaire +3 more sources
Improved Measurements of the IXPE Crab Polarization
The Astrophysical Journal, 2023 X-ray polarization from the Imaging X-ray Polarimetry Explorer (IXPE) provides an important new probe of the geometry of the pulsar emission zone and of particle acceleration in the surrounding pulsar wind nebula.
Josephine Wong +2 more
doaj +1 more source
Super-giant pulses from the Crab pulsar: energy distribution and occurrence rate [PDF]
Monthly Notices of the Royal Astronomical Society: Letters, 2019 We present statistical analysis of a fluence-limited sample of over 1100 giant pulses from the Crab pulsar, with fluence > 130 Jy ms at ∼1330 MHz. These were detected in ∼260 h of observation with the National Centre for Radio Astrophysics (NCRA) 15 m ...
Apurba Bera, J. Chengalur
semanticscholar +1 more source
Temporal variations in scattering and dispersion measure in the Crab Pulsar and their effect on timing precision [PDF]
Monthly notices of the Royal Astronomical Society, 2018 We have measured variations in scattering time scales in the Crab Pulsar over a 30-year period, using observations made at 610 MHz with the 42-ft telescope at Jodrell Bank Observatory.
J. McKee +5 more
semanticscholar +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
Timothy H. Hankins, Jean A. Eilek
openaire +5 more sources
THE CRAB PULSAR AT CENTIMETER WAVELENGTHS. II. SINGLE PULSES [PDF]
, 2016 We have carried out new, high-frequency, high-time-resolution observations of the Crab pulsar. Combining these with our previous data, we characterize bright single pulses associated with the Main Pulse, both the Low-Frequency and High-Frequency ...
T. Hankins, J. Eilek, Glenn Jones
semanticscholar +1 more source
Calibration of the Timing Performance of GECAM-C
The Astrophysical Journal Supplement Series, 2023 As a new member of the Gravitational-wave high-energy Electromagnetic Counterpart All-sky Monitor (GECAM) after GECAM-A and GECAM-B, GECAM-C (originally called HEBS), which was launched on board the SATech-01 satellite on 2022 July 27, aims to monitor ...
Shuo Xiao +37 more
doaj +1 more source
Resolving the Crab pulsar wind nebula at teraelectronvolt energies [PDF]
Nature Astronomy, 2019 The Crab nebula is one of the most-studied cosmic particle accelerators, shining brightly across the entire electromagnetic spectrum up to very-high-energy gamma rays1,2.
H. Collaboration
semanticscholar +1 more source
Turbulent Diffusion of the Particles within Pulsar Wind Nebulae
The Astrophysical Journal, 2023 A turbulent diffusion model is presented to account for the energy and spatial diffusion of the particles within pulsar wind nebulae (PWNe), with the assumption that the energy injected from the pulsar into the nebula is split between the turbulence ...
Fang-Wu Lu, Bo-Tao Zhu, Wen Hu, Li Zhang
doaj +1 more source