Discovery of Spatial and Spectral Structure in the X-Ray Emission from the Crab Nebula

  title={Discovery of Spatial and Spectral Structure in the X-Ray Emission from the Crab Nebula},
  author={Martin. C. Weisskopf and J. Jeff Hester and Allyn F. Tennant and Ronald F. Elsner and Norbert S. Schulz and Herman L. Marshall and Margarita Karovska and Joy S. Nichols and Douglas A. Swartz and Jeffery J. Kolodziejczak and Stephen L. O’Dell},
  journal={The Astrophysical Journal Letters},
  pages={L81 - L84}
The Chandra X-Ray Observatory observed the Crab Nebula and pulsar during orbital calibration. Zeroth-order images with the High-Energy Transmission Grating (HETG) readout by the Advanced CCD Imaging Spectrometer spectroscopy array (ACIS-S) show a striking richness of X-ray structure at a resolution comparable to that of the best ground-based visible-light observations. The HETG-ACIS-S images reveal, for the first time, an X-ray inner ring within the X-ray torus, the suggestion of a hollow-tube… 

Figures from this paper

Spatial Variation of the X-Ray Spectrum of the Crab Nebula
We present a spectral analysis of the Crab Nebula obtained with the Chandra X-ray observatory. The X-ray spectrum is characterized by a power law whose index varies across the nebula. The variation
Faint X-Ray Structure in the Crab Pulsar Wind Nebula
We report on a Chandra observation of the Crab Nebula that gives the first clear view of the faint boundary of the Crab's X-ray-emitting pulsar wind nebula. There is structure in all directions.
We present a new study of the X-ray spectral properties of the Crab Pulsar. The superb angular resolution of the Chandra X-Ray Observatory enables distinguishing the pulsar from the surrounding
Chandra Phase-resolved X-Ray Spectroscopy of the Crab Pulsar
We present the first phase-resolved study of the X-ray spectral properties of the Crab pulsar that covers all pulse phases. The superb angular resolution of the Chandra X-Ray Observatory enables
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
Shedding new light on the Crab with polarized X-rays
The polarization parameters for the pulsar itself are measured for the first time in the X-ray energy band and are consistent with observations at optical wavelengths.
The Chandra X-Ray Observatory observed the Crab pulsar using the Low-Energy Transmission Grating with the High-Resolution Camera. Time-resolved zeroth-order images reveal that the pulsar emits X-rays
Discovery of Powerful Gamma-Ray Flares from the Crab Nebula
The detection of strong gamma-ray flares observed by the AGILE satellite in September 2010 and October 2007 challenge standard models of nebular emission and require power-law acceleration by shock-driven plasma wave turbulence within an approximately 1-day time scale.
New constraints on the structure and evolution of the pulsar wind Nebula 3C 58
We present an investigation of the spectral and spatial structure of the X-ray emission from 3C 58 based on a 350 ks observation with the Chandra X-ray Observatory. This deep image, obtained as part
On the origin of variable gamma-ray emission from the Crab nebula
The oblique geometry of the pulsar wind termination shock ensures that the Doppler beaming has a strong impact on the shock emission. We illustrate this using the recent relativistic


High-resolution X-ray spectroscopy of the Crab Nebula and the oxygen abundance of the interstellar medium
The measurement and analysis of a high-resolution soft X-ray spectrum of the Crab Nebula obtained with the Focal Plane Crystal Spectrometer on the Einstein Observatory are reported. A hydrogen column
A scanning modulation collimator observation of the high-energy X-ray source in the Crab Nebula
Two-dimensional maps of the 22-64 keV emission from the Crab Nebula with an angular resolution of 15 arcsec has been synthesized. The maps are generated by application of a maximum entropy method
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
CCD observations of the polarization of the Crab Nebula
CCD observations are used to map the intensity distribution and polarization of the optical synchrotron radiation of the Crab Nebula. The data indicate that the Crab Nebula has a large-scale magnetic
Ultraviolet Imaging Telescope observations of the Crab Nebula
We obtained ultraviolet images of the Crab Nebula with the Ultraviolet Imaging Telescope (UIT) during the Astro-1 Space Shuttle mission in 1990 December. The UV continuum morphology of the Crab is
WFPC2 Studies of the Crab Nebula. I. HST and ROSAT Imaging of the Synchrotron Nebula
We present images of the Crab synchrotron nebula obtained with the Wide Field and Planetary Camera 2 (WFPC2) on board the Hubble Space Telescope. These data are compared with ROSAT HRI images, and
Temporal Variability of the X-Ray Emission of the Crab Nebula Torus
We present ROSAT HRI observations of the Crab Nebula spanning the 6 years from 1991 March to 1997 March. A comparison of the observations reveals that there are significant (>10 σ) differences in the
Structure of relativistic shocks in pulsar winds: A model of the wisps in the Crab Nebula
We propose a model of a optical 'wisps' of the Crab Nebula, features observed in the nebular synchrotron surface brightness near the central pulsar, as manifestations of the internal structure of the
An axisymmetric magnetohydrodynamic model for the Crab pulsar wind bubble
We extend Kennel and Coroniti's (1984) spherical magnetohydrodynamic models for the Crab Nebula to include the pinching effect of the toroidal magnetic field. Since the bulk nebular flow is likely to
Confinement of the Crab pulsar's wind by its supernova remnant
We construct a steady state, spherically symmetric, magnetohydrodynamic model of the Crab nebual. A highly relativistic, positronic pulsar wind is terminated by a strong MHD shock that decelerates