ASCA Observation of the Supernova Remnant W49B

Details ASCA Observation of the Supernova Remnant W49B ASCA Observation of the Supernova Remnant W49B

Oct 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995pasj...47l..31f&link_type=abstract

Publications of the Astronomical Society of Japan, v.47, p.L31-L35.

Astronomy and Astrophysics

Astronomy

31

Ism: Individual (W49B), Shock Waves, Supernovae, Supernova Remnants, X-Rays: Sources, X-Rays: Spectra

Scientific paper

The supernova remnant W49B with a center-filled X-ray morphology was observed with the Japanese X-ray satellite ASCA, and a spectrum of unprecedented quality was obtained with the X-ray CCD cameras on board. The observed spectrum is consistent with entirely thermal emission, and individual K emission lines from highly ionized atoms of Si, S, Ar, Ca, and Fe are clearly resolved. It cannot, however, be reproduced by a single plasma component, even if non-equilibrium ionization is introduced, and requires multiple plasma components. The images constructed with photons of the Si-, S-, and Fe-lines, respectively, indicate that iron ions are mostly confined to the inner part of the remnant, and that those of the lower-Z elements form an outer envelope. This feature is interpreted as being due to a stratified distribution of elements.

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