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2013MNRAS.435..910H - Mon. Not. R. Astron. Soc., 435, 910-916 (2013/October-3)
Proper motions of Hα filaments in the supernova remnant RCW 86.
HELDER E.A., VINK J., BAMBA A., BLEEKER J.A.M., BURROWS D.N., GHAVAMIAN P. and YAMAZAKI R.
Abstract (from CDS):
The optical proper motion is lower than the previously measured X-ray proper motion of north-eastern region. The new measurements are consistent with the previously measured proton temperature of 2.3±0.3keV, assuming no cosmic ray acceleration. However, within the uncertainties, moderately efficient (<27 percent) shock acceleration is still possible. The combination of optical proper motion and proton temperature rule out the possibility that RCW 86 has a distance less than 1.5kpc.
The similarity of the proper motions in the north-east and south-east is peculiar, given the different densities and X-ray emission properties of the regions. The north-eastern region has lower densities and the X-ray emission is synchrotron dominated, suggesting that the shock velocities should be higher than in the south-eastern, thermal X-ray dominated, region. A possible solution is that the Hα emitting filaments are biased towards denser regions, with lower shock velocities. Alternatively, in the north-east the shock velocity may have decreased rapidly during the past 200yr, and the X-ray synchrotron emission is an afterglow from a period when the shock velocity was higher.
Abstract Copyright: © 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2013)
Journal keyword(s): ISM: supernova remnants, cosmic rays
Simbad objects: 6
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