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http://hdl.handle.net/20.500.12386/28331
Campo DC | Valore | Lingua |
---|---|---|
dc.contributor.author | Kehrig, C. | en_US |
dc.contributor.author | Vílchez, J. M. | en_US |
dc.contributor.author | Guerrero, M. A. | en_US |
dc.contributor.author | Iglesias-Páramo, J. | en_US |
dc.contributor.author | HUNT, Leslie Kipp | en_US |
dc.contributor.author | Duarte-Puertas, S. | en_US |
dc.contributor.author | Ramos-Larios, G. | en_US |
dc.date.accessioned | 2020-11-13T15:11:18Z | - |
dc.date.available | 2020-11-13T15:11:18Z | - |
dc.date.issued | 2018 | en_US |
dc.identifier.issn | 0035-8711 | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/28331 | - |
dc.description.abstract | SBS 0335 - 052E, one of the most metal-poor (Z ∼ 3-4{{ per cent}} Z<SUB>☉</SUB>) He II-emitter starbursts known in the nearby Universe, is studied using optical VLT/MUSE spectroscopic and Chandra X-ray observations. We spatially resolved the spectral map of the nebular He II λ4686 emission from which we derived for the first time the total He II-ionizing energy budget of SBS 0335 - 052E. The nebular He II line is indicative of a quite hard ionizing spectrum with photon energies > 4 Ryd, and is observed to be more common at high-z than locally. Our study rules out a significant contribution from X-ray sources and shocks to the He II photoionization budget, indicating that the He<SUP>+</SUP> excitation is mainly due to hot stellar continua. We discovered a new WR knot, but we also discard single Wolf-Rayet stars as the main responsible for the He II ionization. By comparing observations with current models, we found that the He II-ionization budget of SBS 0335 - 052E can only be produced by either single, rotating metal-free stars or a binary population with Z ∼ 10<SUP>-5</SUP> and a `top-heavy' initial mass function. This discrepancy between the metallicity of such stars and that of the H II regions in SBS 0335 - 052E is similar to results obtained by Kehrig et al. for the very metal-deficient He II-emitting galaxy IZw18. These results suggest that the He II ionization is still beyond the capabilities of state-of-the-art models. Extremely metal-poor, high-ionizing starbursts in the local Universe, like SBS 0335 - 052E, provide unique laboratories for exploring in detail the extreme conditions likely prevailing in the reionization era. | en_US |
dc.language.iso | eng | en_US |
dc.title | The extended He II λ4686 emission in the extremely metal-poor galaxy SBS 0335 - 052E seen with MUSE | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.1093/mnras/sty1920 | en_US |
dc.identifier.scopus | 2-s2.0-85056797303 | en_US |
dc.identifier.isi | 000442567900073 | en_US |
dc.identifier.url | https://academic.oup.com/mnras/article-abstract/480/1/1081/5056186?redirectedFrom=fulltext | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 480 | en_US |
dc.relation.issue | 1 | en_US |
dc.relation.firstpage | 1081 | en_US |
dc.type.referee | REF_1 | en_US |
dc.description.numberofauthors | 7 | en_US |
dc.description.international | sì | en_US |
dc.contributor.country | ESP | en_US |
dc.relation.scientificsector | FIS/05 - ASTRONOMIA E ASTROFISICA | en_US |
dc.relation.journal | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | en_US |
dc.type.miur | 262 Articolo in rivista | - |
dc.identifier.adsbibcode | 2018MNRAS.480.1081K | 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.cerifentitytype | Publications | - |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.fulltext | With Fulltext | - |
item.grantfulltext | open | - |
item.languageiso639-1 | en | - |
item.openairetype | Article | - |
crisitem.journal.journalissn | 0035-8711 | - |
crisitem.journal.ance | E112946 | - |
crisitem.author.dept | O.A. Arcetri | - |
crisitem.author.orcid | 0000-0001-9162-2371 | - |
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2018MNRAS.480.1081Kehrig.pdf | Pdf editoriale | 5.67 MB | Adobe PDF | Visualizza/apri |
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