The Slow Temperature Equilibration behind the Shock Front of SN 1006

2003/03/03 by Jacco Vink, J. Martin Laming, J. M. Laming +5 · 6 citations
Physics and Astronomy · #Astrophysical Phenomena and Observations #Astrophysics and Cosmic Phenomena #Gamma-ray bursts and supernovae #astro-ph

paper · pdf · doi:10.1086/375125

published as Astrophys.J. 587 (2003) L31-L34 · Accepted by Astrophysical Journal Letters, 4 pages, 4 figures. One of the original figures has been replaced by a color version (Fig. 1a)

arxiv created 2003/03/03 · openalex publication_date 2003/03/25 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/31

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 log n e t ≃ 9.2.

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