Indications of a Si-rich bilateral jet of ejecta in the Vela SNR observed with XMM-Newton

Context. The Vela supernova remnant displays several ejecta, which are fragment-like features protruding beyond the front of its primary blast shock wave. They appear to be "shrapnel", bowshock-shaped relics of the supernova explosion. One of these pieces of shrapnel (A), located in the no...

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Autores principales: García, F, Suárez, Alejandra Etelvina, Miceli, M., Bocchino, F., Combi, Jorge Ariel, Orlando, S., Sasaki, M.
Formato: Articulo
Lenguaje:Inglés
Publicado: 2017
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Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/87632
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id I19-R120-10915-87632
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Astronómicas
ISM: individual objects: Vela SNR
ISM: supernova remnants
X-rays: ISM
spellingShingle Ciencias Astronómicas
ISM: individual objects: Vela SNR
ISM: supernova remnants
X-rays: ISM
García, F
Suárez, Alejandra Etelvina
Miceli, M.
Bocchino, F.
Combi, Jorge Ariel
Orlando, S.
Sasaki, M.
Indications of a Si-rich bilateral jet of ejecta in the Vela SNR observed with XMM-Newton
topic_facet Ciencias Astronómicas
ISM: individual objects: Vela SNR
ISM: supernova remnants
X-rays: ISM
description Context. The Vela supernova remnant displays several ejecta, which are fragment-like features protruding beyond the front of its primary blast shock wave. They appear to be "shrapnel", bowshock-shaped relics of the supernova explosion. One of these pieces of shrapnel (A), located in the northeastern edge of the remnant, is peculiar because its X-ray spectrum exhibits a high Si abundance, in contrast to the other observed ejecta fragments, which show enhanced O, Ne, and Mg abundances. Aims. In this Letter we present the analysis of another ejecta fragment located opposite to shrapnel A with respect to the center of the shell, in the southwestern boundary of the remnant, named shrapnel G. We aim to fully characterize its X-ray emission to gather new information about the core-collapse supernova explosion mechanism. Methods. We thoroughly analyzed a dedicated XMM-Newton observation of shrapnel G by producing background-subtracted and exposure-corrected maps in different energy ranges, which we complemented with a spatially resolved spectral analysis of the X-ray emission. Results. The fragment presents a bowshock-like shape with its anti-apex pointing to the center of the remnant. Its X-ray spectrum is best fit by a thermal plasma out of equilibrium of ionization with low O and Fe, roughly solar Ne and Mg, and a significantly high Si abundance, which is required to fit a very clear Si line at ∼1.85 keV. Its chemical composition and spectral properties are compatible with those of shrapnel A, which is located on the opposite side of the remnant. Conclusions. As a consequence of the nucleosynthesis, pieces of Si-rich shrapnel are expected to originate in deeper layers of the progenitor star compared to ejecta with lower-Z elements. A high velocity and density contrast with respect to the surrounding ejecta are necessary to make shrapnel A and G overtake the forward shock. The line connecting shrapnel A and G crosses almost exactly the expansion center of the remnant, strongly suggesting a Si-rich jet-counterjet structure, reminiscent of that observed in the young remnant Cas A.
format Articulo
Articulo
author García, F
Suárez, Alejandra Etelvina
Miceli, M.
Bocchino, F.
Combi, Jorge Ariel
Orlando, S.
Sasaki, M.
author_facet García, F
Suárez, Alejandra Etelvina
Miceli, M.
Bocchino, F.
Combi, Jorge Ariel
Orlando, S.
Sasaki, M.
author_sort García, F
title Indications of a Si-rich bilateral jet of ejecta in the Vela SNR observed with XMM-Newton
title_short Indications of a Si-rich bilateral jet of ejecta in the Vela SNR observed with XMM-Newton
title_full Indications of a Si-rich bilateral jet of ejecta in the Vela SNR observed with XMM-Newton
title_fullStr Indications of a Si-rich bilateral jet of ejecta in the Vela SNR observed with XMM-Newton
title_full_unstemmed Indications of a Si-rich bilateral jet of ejecta in the Vela SNR observed with XMM-Newton
title_sort indications of a si-rich bilateral jet of ejecta in the vela snr observed with xmm-newton
publishDate 2017
url http://sedici.unlp.edu.ar/handle/10915/87632
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