Ions crossing the contact discontinuity of an astrophysical shock

Details Ions crossing the contact discontinuity of an astrophysical shock Ions crossing the contact discontinuity of an astrophysical shock

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009hrxs.confe...2b&link_type=abstract

"High Resolution X-ray Spectroscopy: Towards IXO, Proceedings of the international workshop held at the Mullard Space Science La

Astronomy and Astrophysics

Astrophysics

Scientific paper

Contact discontinuities (CDs) of astrophysical shocks are extremely difficult to probe directly. We will present spectroscopic evidence for what we believe is shocked ions (kT ~ 100 eV) crossing the CD and penetrating the un-shocked gas (kT ~ 1 eV). This effect is deduced from the observation of a narrow radiative recombination continuum (RRC) in the X-ray spectrum of the PN BD+30 3639, indicating bare C ions are recombining with cool electrons at kTe = 1.7 +/- 1.3 eV. The RRC flux ratio of C VII to C VI constrains the temperature jump across the CD to Delta(kT) > 80 eV, providing for the first time direct evidence for the stark temperature disparity between the two sides of an astrophysical CD, and constraining the role of magnetic fields and heat conduction in PNs accordingly.

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