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http://hdl.handle.net/20.500.12386/30435
Campo DC | Valore | Lingua |
---|---|---|
dc.contributor.author | CARDILLO , MARTINA | en_US |
dc.contributor.author | MARCHILI, Nicola | en_US |
dc.contributor.author | PIANO, Giovanni | en_US |
dc.contributor.author | GIULIANI, ANDREA | en_US |
dc.contributor.author | TAVANI, MARCO | en_US |
dc.contributor.author | MOLINARI, Sergio | en_US |
dc.date.accessioned | 2021-02-17T15:16:42Z | - |
dc.date.available | 2021-02-17T15:16:42Z | - |
dc.date.issued | 2019 | en_US |
dc.identifier.issn | 0004-6361 | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/30435 | - |
dc.description.abstract | Context. In recent years, an in-depth γ-ray analysis of the Orion region has been carried out by the AGILE and Fermi/LAT (Large Area Telescope) teams with the aim of estimating the H2-CO conversion factor, XCO. The comparison of the data from both satellites with models of diffuse γ-ray Galactic emission unveiled an excess at (l, b) = [213.9, -19.5], in a region at a short angular distance from the OB star κ-Ori. Possible explanations of this excess are scattering of the so-called "dark gas", non-linearity in the H2-CO relation, or cosmic-ray (CR) energization at the κ-Ori wind shock. Aims: Concerning this last hypothesis, we want to verify whether cosmic-ray acceleration or re-acceleration could be triggered at the κ-Ori forward shock, which we suppose to be interacting with a star-forming shell detected in several wavebands and probably triggered by high energy particles. Methods: Starting from the AGILE spectrum of the detected γ-ray excess, showed here for the first time, we developed a valid physical model for cosmic-ray energization, taking into account re-acceleration, acceleration, energy losses, and secondary electron contribution. Results: Despite the characteristic low velocity of an OB star forward shock during its "snowplow" expansion phase, we find that the Orion γ-ray excess could be explained by re-acceleration of pre-existing cosmic rays in the interaction between the forward shock of κ-Ori and the CO-detected, star-forming shell swept-up by the star expansion. According to our calculations, a possible contribution from freshly accelerated particles is sub-dominant with respect the re-acceleration contribution. However, a simple adiabatic compression of the shell could also explain the detected γ-ray emission. Futher GeV and TeV observations of this region are highly recommended in order to correctly identify the real physical scenario. | en_US |
dc.language.iso | eng | en_US |
dc.title | The Orion Region: Evidence of enhanced cosmic-ray density in a stellar wind forward shock interaction with a high density shell | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.1051/0004-6361/201833651 | en_US |
dc.identifier.scopus | 2-s2.0-85060872136 | en_US |
dc.identifier.isi | 000456967000002 | en_US |
dc.identifier.url | http://arxiv.org/abs/1901.01764 | en_US |
dc.identifier.url | https://www.aanda.org/articles/aa/full_html/2019/02/aa33651-18/aa33651-18.html | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 622 | en_US |
dc.relation.firstpage | A57 | en_US |
dc.relation.numberofpages | 8 | en_US |
dc.relation.article | id. A57 | en_US |
dc.type.referee | REF_1 | 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 | 2019A&A...622A..57C | 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 | IAPS Roma | - |
crisitem.author.dept | IRA Bologna | - |
crisitem.author.dept | IAPS Roma | - |
crisitem.author.dept | IASF Milano | - |
crisitem.author.dept | IAPS Roma | - |
crisitem.author.dept | IAPS Roma | - |
crisitem.author.orcid | 0000-0001-8877-3996 | - |
crisitem.author.orcid | 0000-0002-5523-7588 | - |
crisitem.author.orcid | 0000-0002-9332-5319 | - |
crisitem.author.orcid | 0000-0002-4315-1699 | - |
crisitem.author.orcid | 0000-0003-2893-1459 | - |
crisitem.author.orcid | 0000-0002-9826-7525 | - |
crisitem.journal.journalissn | 0004-6361 | - |
crisitem.journal.ance | E016240 | - |
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