Lunar Occultation of X-ray Emission from the Crab Nebula

  title={Lunar Occultation of X-ray Emission from the Crab Nebula},
  author={Stuart C. Bowyer and E. T. Byram and Talbot A. Chubb and Herbert Friedman},
  pages={912 - 917}
The x-ray flux from the Crab Nebula was observed during a lunar occultation on 7 July 1964. As the moon covered the central region of the nebula, the x-ray flux decreased gradually. The source appears to extend over a volume about 1 light-year in diameter. 
Lunar occultation of the hard X-ray source in the Crab Nebula
HARD X rays from the Crab Nebula were observed at a lunar occultation on 24 January 1975 with two sets of scintillation counters on board two balloons launched from Hyderabad (17°20′N, 78°27′E). The
X-ray Pulsar in the Crab Nebula
X-ray pulsations have been observed in the Crab Nebula at a frequency closely matching the radio and optical pulsations. About 5 percent of the total x-ray power of the nebula appears in the pulsed
Production of X-radiation in the Crab nebula
It is suggested that the X-rays from the Crab nebula are due to the synchrotron radiation of electrons of energy ∼4×1012 eV in the magnetic field of the central region of the nebula, the magnetic
X-ray Observations of the Crab Nebula
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X-ray morphology of the Crab nebula
The Crab nebula is so far the only object where the direct interaction between a pulsar and the surrounding remnants of the supernova can be studied. Here we present an X-ray image of the Crab nebula
Angular Size of the High Energy X-ray Source in the Crab Nebula
New data on the spatial structure of the source of 25 to 100 keV X-rays in the Crab nebula, obtained with a balloon-borne X-ray modulation collimator is reported, showing that the radio and optical pulsar NP 0532 has been identified with a central star in the nebula.
The X-Ray Polarization of the Crab Nebula
A rocket-borne X-ray polarimeter was flown to search for polarization in Taurus X-1. Although a result consistent with zero polarization was obtained, the statistics were such that X-ray polarization
X-ray Scattering by Grains in the Direction of the Crab Pulsar and Sco XR-1
A discussion of the hypothesis of Slysh that all of the X-ray flux originates in pulsed form at the pulsar and that scattering by grains washes out the time coherence and produces the observed angular size is discussed.
X-Ray Study of the Crab Nebula and the Crab and Vela Pulsars
The Crab Nebula has been intensely studied by X-ray astronomers ever since its discovery as the first, optically identified X-ray object (Bowyer et al. 1964); and a large majority of X-ray
X-Ray and Optical Observations of the Pulsar NP 0532 in the Crab Nebula
The existence of a strong pulsed X-ray signal from the pulsar NP 0532 is confirmed. The phases and the shapes of the X-ray and optical pulses are compared.


Neutron Stars as X-ray Sources
DURING the rocket flight reported in the preceding communication, Bowyer et al. found two celestial X-ray sources with diameters less than 5°. One was located in the northern part of Scorpius in a
X-ray Sources in the Galaxy
A SEARCH for X-ray emission from galactic objects on April 29, 1963, disclosed two localized sources, one of which appeared in Scorpius and the other in the direction of the Crab Nebula. The
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Man inhabits a universe composed of a great variety of elements and their isotopes. In Table I,1 a count of the stable and radioactive elements and isotopes is listed. Ninety elements are found
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The semiempirical abundance table of Suess and Urey has been very helpful to nuclear physicists in determining the relative importance of various mechanisms of nucleogenesis in contributing to the
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