Spatially Resolved X-ray Spectroscopy of Vela Shrapnel A

Details Spatially Resolved X-ray Spectroscopy of Vela Shrapnel A Spatially Resolved X-ray Spectroscopy of Vela Shrapnel A

2006-03-17

arxiv.org/abs/astro-ph/0603454v1

Astrophys.J. 642 (2006) 917-922

Astronomy and Astrophysics

Astrophysics

11 pages, 10 figures, ApJ 10 May 2006, v642 2 issue

Scientific paper

10.1086/501434

We present the 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 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 Ly$_\alpha$ emission line in all the spectra. All the spectra are well represented by the non-equilibrium ionization (NEI) model. The abundances are estimated to be O$\sim$0.3, Ne$\sim$0.9, Mg$\sim$0.8, Si$\sim$3, Fe$\sim$0.8 times their solar values. The non-solar 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 supernova explosion are well mixed with swept-up interstellar medium.

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