SIMBAD references

2010ApJ...719L.140H - Astrophys. J., 719, L140-L144 (2010/August-3)

Cosmic-ray acceleration efficiency versus temperature equilibration: the case of SNR 0509-67.5.

HELDER E.A., KOSENKO D. and VINK J.

Abstract (from CDS):

We study the 0509-67.5 supernova remnant in the Large Magellanic Cloud with the VLT/FORS2 spectrograph. We detect a broad component in the Hα emission with an FWHM of 2680±70 km/s and 3900±800 km/s for the southwest (SW) and northeast (NE) shocks, respectively. For the SW, the proton temperature appears to be too low for the shock velocity, which we attribute to a cosmic-ray pressure behind the shock front of at least 20% of the total pressure. For the NE, the post-shock proton temperature and the shock velocity are compatible, only if the plasma behind the shock front has a degree of thermal equilibrium of over 20%, which is at odds with current models for temperature equilibration behind fast shocks, which do not accelerate cosmic rays. If we assume the electron temperature to be less than 10% of the proton temperature, we find a post-shock cosmic-ray pressure of at least 7%.

Abstract Copyright:

Journal keyword(s): acceleration of particles - ISM: individual objects: SNR 0509-67.5 - ISM: supernova remnants - radiation mechanisms: thermal - shock waves

Errata: erratum vol. 737, art. L46 (2011)

Simbad objects: 4

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