Results 51 to 60 of about 15,098 (205)
Photon splitting bound on Lorentz Violation in QED from multi-TeV photon observation.
EPJ Web of Conferences, 2018 We calculate the width of photon splitting to three photons in a special model of quantum electrodynamics with broken Lorentz invariance. This process may lead to a sharp cut-off in a photon spectrum of a given astrophysical source.
Astapov Konstantin +2 more
doaj +1 more source
FOCUSING OF 3C144 SOURCE RADIATION BY THE SOLAR CORONA
Odessa Astronomical Publications, 2012 The research of solar corona by the compact cosmic source radiation was made on URAN-4 radio telescope. In the period from June 6 to June 20 2012 the flow of Crab nebula was measured on the 20 MHz and 25 MHz frequencies. During the eclipse we observe the
V. V. Galanin +2 more
doaj +1 more source
Spitzer Space Telescope Infrared Imaging and Spectroscopy of the Crab Nebula [PDF]
, 2006 We present 3.6, 4.5, 5.8, 8.0, 24, and 70 micron images of the Crab Nebula obtained with the Spitzer Space Telescope IRAC and MIPS cameras, Low- and High-resolution Spitzer IRS spectra of selected positions within the nebula, and a near-infrared ground ...
Bandiera R. +17 more
core +4 more sources
The Crab Nebula Revisited Using HST/WFC3
The Astrophysical JournalIt has been over 24 years since the iconic Crab Nebula has been visited by the high spatial resolution eye of the Hubble Space Telescope (HST). The expanding nebula is dynamic on these timescales, with many of the outer filaments of the nebula known to ...
William P. Blair +7 more
doaj +1 more source
Gamma-ray flare and absorption in Crab Nebula: Lovely TeV-PeV astrophysics
, 2012 We spectrally fit the GeV gamma-ray flares recently-observed in the Crab Nebula by considering a small blob Lorentz-boosted towards us. We point out that the corresponding inverse-Compton flare at TeV--PeV region is more enhanced than synchrotron by a ...
Ioka, Kunihito +2 more
core +1 more source
, 2011 The remarkable Crab Nebula is powered by an energetic pulsar whose relativistic wind interacts with the inner parts of the Supernova Remnant SN1054. Despite low-intensity optical and X-ray variations in the inner Nebula, the Crab has been considered ...
Tavani, Marco
core +1 more source
Joint photon-electron Lorentz violation parameter plane from LHAASO data
Physics Letters B, 2022 The Large High Altitude Air Shower Observatory (LHAASO) is one of the most sensitive gamma-ray detector arrays, whose ultrahigh-energy (UHE) work bands not only help to study the origin and acceleration mechanism of UHE cosmic rays, but also provide the ...
Ping He, Bo-Qiang Ma
doaj +1 more source
Broadband X-ray Imaging and Spectroscopy of the Crab Nebula and Pulsar with NuSTAR [PDF]
, 2015 We present broadband (3 -- 78 keV) NuSTAR X-ray imaging and spectroscopy of the Crab nebula and pulsar. We show that while the phase-averaged and spatially integrated nebula + pulsar spectrum is a power-law in this energy band, spatially resolved ...
An, Hongjun +14 more
core +2 more sources
High-sensitivity Beamformed Observations of the Crab Pulsar's Radio Emission
The Astrophysical Journal, 2023 We analyzed four epochs of beamformed European VLBI Network data of the Crab Pulsar at 1658.49 MHz. With the high sensitivity resulting from resolving out the Crab Nebula, we are able to detect even the faint high-frequency components in the folded ...
Rebecca Lin, Marten H. van Kerkwijk
doaj +1 more source
Detonative Propagation and Accelerative Expansion of the Crab Nebula Shock Front
, 2011 The accelerative expansion of the Crab nebula's outer envelope is a mystery in dynamics as a conventional expanding blast wave decelerates when bumping into the surrounding interstellar medium.
Gao, Yang, Law, Chung K.
core +1 more source