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Post Info TOPIC: The veil nebula


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Cygnus Loop Supernova Remnant
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Title: Soft X-ray Spectroscopy of the Cygnus Loop Supernova Remnant
Authors: Randall L. McEntaffer, Webster Cash

The Cygnus X-ray Emission Spectroscopic Survey (CyXESS) sounding rocket payload was launched from White Sands Missile Range on 2006 November 20 and obtained a high resolution spectrum of the Cygnus Loop supernova remnant in the soft X-rays. The novel X-ray spectrograph incorporated a wire-grid collimator feeding an array of gratings in the extreme off-plane mount which ultimately dispersed the spectrum onto Gaseous Electron Multiplier (GEM) detectors. This instrument recorded 65 seconds of usable data between 43-49.5 A in two prominent features. The first feature near 45 A is dominated by the He-like triplet of O7 in second order with contributions from Mg10 and Si9-Si12 in first order, while the second feature near 47.5 A is first order S9 and S10. Fits to the spectra give an equilibrium plasma at \log(T)=6.2 (kT_e=0.14 keV) and near cosmic abundances. This is consistent with previous observations, which demonstrated that the soft x-ray emission from the Cygnus Loop is dominated by interactions between the initial blast wave with the walls of a precursor formed cavity surrounding the Cygnus Loop and that this interaction can be described using equilibrium conditions.

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RE: The veil nebula
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The NASA/ESA Hubble Space Telescope has photographed three magnificent sections of the Veil Nebula - the shattered remains of a supernova that exploded some 5-10,000 years ago. The new Hubble images provide beautiful views of the delicate, wispy structure resulting from this cosmic explosion.



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Click for larger image.

The NASA/ESA Hubble Space Telescope has photographed three magnificent sections of the Veil Nebula - the shattered remains of a supernova that exploded some 5-10,000 years ago. The new Hubble images provide beautiful views of the delicate, wispy structure resulting from this cosmic explosion.


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The veil nebula
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The veil nebula (Cygnus Loop)

Position(2000): RA:     20h 45m 38.0s, Dec:     +30° 42′ 30″

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