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Title:
Spatially Resolved X-Ray Spectroscopy of Vela Shrapnel A
Authors:
Katsuda, S.; Tsunemi, H.
Affiliation:
AA(Department of Earth and Space Science, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, 560-0043 Osaka, Japan; , .), AB(Department of Earth and Space Science, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, 560-0043 Osaka, Japan; , .)
Publication:
The Astrophysical Journal, Volume 642, Issue 2, pp. 917-922. (ApJ Homepage)
Publication Date:
05/2006
Origin:
UCP
ApJ Keywords:
ISM: Abundances, ISM: individual (Vela supernova remnant), ISM: Supernova Remnants, X-Rays: ISM
DOI:
10.1086/501434
Bibliographic Code:
2006ApJ...642..917K

Abstract

We present detailed X-ray spectroscopy of Vela shrapnel A with the XMM-Newton satellite. Vela shrapnel A is one of several protrusions identified as bullets from the Vela supernova explosion. The XMM-Newton image shows that shrapnel A consists of a bright knot and a faint trailing wake. We extracted spectra from various regions, finding a prominent Si Lyα emission line in all the spectra. All the spectra are well represented by the nonequilibrium ionization (NEI) model. The abundances are estimated to be O~0.3, Ne~0.9, Mg~0.8, Si~3, and Fe~0.8 times their solar values. The nonsolar abundance ratio between O and Si indicates that shrapnel A originates from a deep layer of a progenitor star. We found that the relative abundances between heavy elements are almost uniform in shrapnel A, which suggests that the ejecta from the supernova explosion are well mixed with swept-up interstellar medium.
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