Results 31 to 40 of about 12,273 (135)
On the origin of variable gamma-ray emission from the Crab Nebula [PDF]
, 2010 The oblique geometry of pulsar wind termination shock ensures that the Doppler beaming has a strong impact on the shock emission. We illustrate this using recent relativistic MHD simulations of the Crab Nebula and also show that the observed size, shape, and distance from the pulsar of the Crab Nebula inner knot are consistent with its interpretation ...
arxiv +1 more source
Six years of VERITAS observations of the Crab Nebula [PDF]
arXiv, 2015 The Crab Nebula is the brightest source in the very-high-energy (VHE) gamma-ray sky and one of the best studied non-thermal objects. The dominant VHE emission mechanism is believed to be inverse Compton scattering of low energy photons on relativistic electrons. While it is unclear how the electrons in the nebula are accelerated to energies of $10^{16}$
arxiv
MAGIC measurement of the Crab Nebula spectrum over three decades in energy [PDF]
, 2011 The Crab Pulsar Wind Nebula is the best studied source of $\gamma$-ray astrophysics. The contribution of the various soft radiation fields to the Inverse Compton component of its high energy emission, the strenght of the internal magnetic field and the maximum energies reached by primary electrons are however still matter of study.
arxiv +1 more source
Observations of the Crab Nebula and Pulsar with VERITAS [PDF]
arXiv, 2007 Observations of the Crab Nebula have proven to be the best tool to calibrate and to characterize the performance of a Cherenkov telescope. Scientifically, it is interesting to measure the energy spectrum of the Crab Nebula close to the inverse-Compton peak where a deviation is expected from the power law seen at energies above 300 GeV. Additionally, it
arxiv
Detection of UHE gamma rays from the Crab Nebula: Physical Implications [PDF]
, 2019 The Crab Nebula is an extreme particle accelerator boosting the energy of electrons up to a few PeV ($10^{15} \ \rm eV$), close to the maximum energy allowed by theory. The physical conditions in the acceleration site and the nature of the acceleration process itself remain highly uncertain.
arxiv +1 more source
The surprising Crab pulsar and its nebula: A review [PDF]
, 2013 The Crab nebula and its pulsar (referred to together as "Crab") have historically played a central role in astrophysics. True to their legacy, several unique discoveries have been made recently. The Crab was found to emit gamma-ray pulsations up to energies of 400 GeV, beyond what was previously expected from pulsars.
arxiv +1 more source
Electron Densities in the Filaments of the Crab Nebula [PDF]
, 1957 Donald E. Osterbrock
openalex +1 more source
Computational Characterization of Astrophysical Species: The Case of Noble Gas Hydride Cations. [PDF]
Front Chem, 2021 Montes de Oca-Estévez MJ, Prosmiti R.
europepmc +1 more source
The Secular Decrease of the Crab Nebula at 927 and 151.5 MHz [PDF]
arXiv, 2005 Long-term measurements have been carried out of the Crab Nebula radio emission flux density relative to Orion A at 927 MHz and relative to Cygnus A and Virgo A at 151.5 MHz. As a result the mean rates have been found of the secular change of the Crab Nebula radio emission flux density: $d_m (927\hbox{MHz})=-(0.18\pm0.10)$% year$^{-1}$ (over the period ...
arxiv