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http://hdl.handle.net/20.500.12386/30834
Campo DC | Valore | Lingua |
---|---|---|
dc.contributor.author | García, F. | en_US |
dc.contributor.author | Suárez, A. E. | en_US |
dc.contributor.author | Miceli, Marco | en_US |
dc.contributor.author | BOCCHINO, Fabrizio | en_US |
dc.contributor.author | Combi, J. A. | en_US |
dc.contributor.author | ORLANDO, Salvatore | en_US |
dc.contributor.author | Sasaki, M. | en_US |
dc.date.accessioned | 2021-04-21T14:31:49Z | - |
dc.date.available | 2021-04-21T14:31:49Z | - |
dc.date.issued | 2017 | en_US |
dc.identifier.issn | 0004-6361 | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/30834 | - |
dc.description.abstract | 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. <BR /> 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. <BR /> 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. <BR /> 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. <BR /> 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. | en_US |
dc.language.iso | eng | en_US |
dc.title | Indications of a Si-rich bilateral jet of ejecta in the Vela SNR observed with XMM-Newton | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.1051/0004-6361/201731418 | en_US |
dc.identifier.scopus | 2-s2.0-85026808250 | en_US |
dc.identifier.url | http://arxiv.org/abs/1707.05215v1 | en_US |
dc.identifier.url | https://www.aanda.org/articles/aa/full_html/2017/08/aa31418-17/aa31418-17.html | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 604 | en_US |
dc.relation.firstpage | L5 | en_US |
dc.type.referee | REF_1 | en_US |
dc.description.numberofauthors | 7 | en_US |
dc.description.international | sì | en_US |
dc.contributor.country | ITA | en_US |
dc.contributor.country | DEU | en_US |
dc.contributor.country | ARG | en_US |
dc.relation.scientificsector | FIS/05 - ASTRONOMIA E ASTROFISICA | en_US |
dc.relation.journal | ASTRONOMY & ASTROPHYSICS | en_US |
dc.type.miur | 262 Articolo in rivista | - |
dc.identifier.adsbibcode | 2017A&A...604L...5G | en_US |
dc.relation.ercsector | ERC sectors::Physical Sciences and Engineering::PE9 Universe sciences: astro-physics/chemistry/biology; solar systems; stellar, galactic and extragalactic astronomy, planetary systems, cosmology, space science, instrumentation | en_US |
dc.description.apc | no | en_US |
dc.description.oa | 1 – prodotto con file in versione Open Access (allegare il file al passo 5-Carica) | en_US |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.openairetype | Article | - |
item.languageiso639-1 | en | - |
item.cerifentitytype | Publications | - |
item.grantfulltext | open | - |
item.fulltext | With Fulltext | - |
crisitem.author.dept | O.A. Palermo | - |
crisitem.author.dept | O.A. Palermo | - |
crisitem.author.dept | O.A. Palermo | - |
crisitem.author.orcid | 0000-0003-0876-8391 | - |
crisitem.author.orcid | 0000-0002-2321-5616 | - |
crisitem.author.orcid | 0000-0003-2836-540X | - |
crisitem.journal.journalissn | 0004-6361 | - |
crisitem.journal.ance | E016240 | - |
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