Query : 2013MNRAS.435..910H

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.


Abstract (from CDS):

We present a proper motion study of the eastern shock-region of the supernova remnant RCW 86 (MSH 14-63, G315.4-2.3), based on optical observations carried out with Very Large Telescope/FOcal Reducer and low dispersion Spectrograph 2 in 2007 and 2010. For both the north-eastern and south-eastern regions, we measure an average proper motion of Hα filaments of 0.10±0.02arc/sec/yr, corresponding to 1200±200km/s at 2.5kpc. There is substantial variation in the derived proper motions, indicating shock velocities ranging from just below 700km/s to above 2200km/s.

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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Number of rows : 6
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
1 SNR B0102-72.3 SNR 01 04 01.2 -72 01 52           ~ 377 1
2 SNR B0509-67.5 SNR 05 09 31 -67 31.3           ~ 209 0
3 ESO 134-11 HII 14 40 29 -62 38.7           ~ 545 1
4 SNR G315.0-02.3 SNR 14 43 00 -62 30.0           ~ 358 1
5 NAME Lupus SN SNR 15 02 22.1 -42 05 49           ~ 1279 1
6 NAME Cyg Loop SNR 20 51.0 +30 40           ~ 873 0

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