Far Ultraviolet Spectroscopy of a Nonradiative Shock in the Cygnus Loop: Implications for the Postshock Electron-Ion Equilibration

Details Far Ultraviolet Spectroscopy of a Nonradiative Shock in the Cygnus Loop: Implications for the Postshock Electron-Ion Equilibration Far Ultraviolet Spectroscopy of a Nonradiative Shock in the Cygnus Loop: Implications for the Postshock Electron-Ion Equilibration

2000-12-14

arxiv.org/abs/astro-ph/0012329v1

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures, text of poster paper presented at the 11th Annual Astrophysics Conference in Maryland, to appear in Young

Scientific paper

10.1063/1.1377092

We present far ultraviolet spectra of a fast (~ 300 km/s) nonradiative shock in the Cygnus Loop supernova remnant. Our observations were performed with the Far Ultraviolet Spectroscopic Explorer (FUSE) satellite, covering the wavelength range 905-1187 Angstroms. The purpose of these observations was to estimate the degree of electron-ion equilibration by (1) examining the variation of O VI 1032, 1038 intensity with position behind the shock, and (2) measuring the widths of the O VI lines. We find significant absorption near the center of the O VI 1032 line, with less absorption in O VI 1038. The absorption equivalent widths imply an O VI column density greatly exceeding that of interstellar O VI along the Cygnus Loop line of sight. We suggest that the absorption may be due to resonant scattering by O VI ions within the shock itself. The widths of the O VI emission lines imply efficient ion-ion equilibration, in agreement with predictions from Balmer-dominated spectra of this shock.

Affiliated with

Also associated with

No associations

Rating

Far Ultraviolet Spectroscopy of a Nonradiative Shock in the Cygnus Loop: Implications for the Postshock Electron-Ion Equilibration does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Far Ultraviolet Spectroscopy of a Nonradiative Shock in the Cygnus Loop: Implications for the Postshock Electron-Ion Equilibration, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Far Ultraviolet Spectroscopy of a Nonradiative Shock in the Cygnus Loop: Implications for the Postshock Electron-Ion Equilibration will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-510311