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Title:
The Slow Temperature Equilibration behind the Shock Front of SN 1006
Authors:
Vink, Jacco; Laming, J. Martin; Gu, Ming Feng; Rasmussen, Andrew; Kaastra, Jelle S.
Affiliation:
AA(Columbia Astrophysics Laboratory, Columbia University, MC 5247, 550 West 120th Street, New York, NY 10027; .; Chandra fellow.), AB(Naval Research Laboratory, Code 7674L, Washington, DC 20375.), AC(Chandra fellow.; Center for Space Research, Massachusetts Institute of Technology, Building 37, 70 Vassar Street, Cambridge, MA 02139.), AD(Columbia Astrophysics Laboratory, Columbia University, MC 5247, 550 West 120th Street, New York, NY 10027; .), AE(Space Research Organization of the Netherlands, Sorbonnelaan 2, NL-3584 CA, Utrecht, Netherlands.)
Publication:
The Astrophysical Journal, Volume 587, Issue 1, pp. L31-L34. (ApJL Homepage)
Publication Date:
04/2003
Origin:
UCP
ApJ Keywords:
Shock Waves, ISM: Supernova Remnants, X-Rays: Individual: Alphanumeric: SN 1006
DOI:
10.1086/375125
Bibliographic Code:
2003ApJ...587L..31V

Abstract

We report on the observation of O VII Doppler line broadening in a compact knot at the edge of SN 1006 detected with the reflective grating spectrometer on board XMM-Newton. The observed line width of σ=3.4+/-0.5 eV at a line energy of 574 eV indicates an oxygen temperature of kT=528+/-150 keV. Combined with the observed electron temperature of ~1.5 keV, the observed broadening is direct evidence for temperature nonequilibration in high Mach number shocks and slow subsequent equilibration. The O VII line emission allows an accurate determination of the ionization state of the plasma, which is characterized by a relatively high forbidden line contribution, indicating lognet~=9.2.
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