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Prog. Theor. Phys. Supplement No.169 (2007) pp. 84-87
A Suzaku Observation of the Low-Ionization Fe-Line Emission from RCW 86
Masaru Ueno,1
Rie Sato,1
Jun Kataoka,1
Ilana Harrus2,3 and
Robert Petre3
on behalf of the Suzaku RCW 86 Team
1Physics Department, Tokyo Institute of Technology, Tokyo 152-8550,
Japan
2Department of Physics and Astronomy, Johns Hopkins University,
Baltimore, MD 21218, USA
3NASA Goddard Space Flight Center, X-ray Astrophysics Laboratory,
Code 662, Greenbelt, MD 20771, USA
Abstract:
The newly operational X-ray satellite Suzaku observed the southwestern
quadrant of the supernova
remnant (SNR) RCW 86 in February 2006 to study the nature of the 6.4 keV
emission line. The new data localize it for the first time; most of the
line emission is adjacent and interior to the forward shock and not at
the locus of the continuum hard emission. We also report the first
detection of a 7.1 keV line that we interpret as the Kβ emission
from low-ionization iron. The Fe-K line features are consistent with a
non-equilibrium plasma of Fe-rich ejecta with
net > 109 cm-3 s and kTe ∼5 keV.
This combination of low
net and high kTe suggests collisionless electron heating
in an SNR shock.
The Fe Kα line shows evidence for intrinsic broadening, with a
width of 47 (34–59) eV (99% error region). The difference of the
spatial distributions of the hard continuum above 3 keV and the Fe-K
line emission support a synchrotron origin for the hard continuum.
URL :
http://ptp.ipap.jp/link?PTPS/169/84/
DOI : 10.1143/PTPS.169.84
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