Please use this identifier to cite or link to this item:
http://hdl.handle.net/20.500.12386/23271
DC Field | Value | Language |
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dc.contributor.author | GIANNINI, Teresa | - |
dc.contributor.author | ANTONIUCCI, Simone | - |
dc.contributor.author | NISINI, Brunella | - |
dc.contributor.author | Lorenzetti, D. | - |
dc.contributor.author | ALCALA', JUAN MANUEL | - |
dc.contributor.author | BACCIOTTI, Francesca | - |
dc.contributor.author | Bonito, Rosaria | - |
dc.contributor.author | PODIO, LINDA | - |
dc.contributor.author | STELZER, BEATE | - |
dc.date.accessioned | 2020-03-16T15:28:26Z | - |
dc.date.available | 2020-03-16T15:28:26Z | - |
dc.date.issued | 2015 | - |
dc.identifier.issn | 0004-637X | - |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/23271 | - |
dc.description | We kindly thank A. Hibbert for providing the Deb Hibbert ( 2011 ) list of A -coefficients of Fe + lines. The ESO staff is acknowledged for support with the observations and the X-shooter pipeline. Financial support from INAF, under PRIN2013 program “Disks, jets and the dawn of planets” is also acknowledged. | - |
dc.description.abstract | The Einstein spontaneous rates (A-coefficients) of Fe<SUP>+</SUP> lines have been computed by several authors with results that differ from each other by up to 40%. Consequently, models for line emissivities suffer from uncertainties that in turn affect the determination of the physical conditions at the base of line excitation. We provide an empirical determination of the A-coefficient ratios of bright [Fe II] lines that would represent both a valid benchmark for theoretical computations and a reference for the physical interpretation of the observed lines. With the ESO-Very Large Telescope X-shooter instrument between 3000 Å and 24700 Å, we obtained a spectrum of the bright Herbig-Haro object HH 1. We detect around 100 [Fe II] lines, some of which with a signal-to-noise ratios >=100. Among these latter lines, we selected those emitted by the same level, whose dereddened intensity ratios are direct functions of the Einstein A-coefficient ratios. From the same X-shooter spectrum, we got an accurate estimate of the extinction toward HH 1 through intensity ratios of atomic species, H I recombination lines and H<SUB>2</SUB> ro-vibrational transitions. We provide seven reliable A-coefficient ratios between bright [Fe II] lines, which are compared with the literature determinations. In particular, the A-coefficient ratios involving the brightest near-infrared lines (λ12570/λ16440 and λ13209/λ16440) are in better agreement with the predictions by the Quinet et al. relativistic Hartree-Fock model. However, none of the theoretical models predict A-coefficient ratios in agreement with all of our determinations. We also show that literature data of near-infrared intensity ratios better agree with our determinations than with theoretical expectations. <P />Based on observations collected with X-shooter at the Very Large Telescope on Cerro Paranal (Chile), operated by the European Southern Observatory (ESO). Program ID: 092.C-0058(A). | - |
dc.language.iso | eng | - |
dc.title | Empirical Determination of Einstein A-coefficient Ratios of Bright [Fe II] Lines | - |
dc.type | Article | - |
dc.identifier.doi | 10.1088/0004-637X/798/1/33 | en_US |
dc.identifier.scopus | 2-s2.0-84919492188 | en_US |
dc.identifier.isi | 000347245100030 | en_US |
dc.identifier.url | https://iopscience.iop.org/article/10.1088/0004-637X/798/1/33 | - |
dc.relation.medium | STAMPA | - |
dc.relation.volume | 798 | - |
dc.relation.issue | 1 | - |
dc.relation.firstpage | 33 | - |
dc.type.referee | REF_1 | - |
dc.description.numberofauthors | 9 | - |
dc.description.international | no | - |
dc.contributor.country | ITA | - |
dc.relation.scientificsector | FIS/05 - ASTRONOMIA E ASTROFISICA | - |
dc.relation.journal | THE ASTROPHYSICAL JOURNAL | - |
dc.type.miur | 262 Articolo in rivista | - |
dc.identifier.adsbibcode | 2015ApJ...798...33G | - |
dc.description.apc | no | - |
dc.description.oa | 1 – prodotto con file in versione Open Access (allegare il file al passo 5-Carica) | - |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.openairetype | Article | - |
item.languageiso639-1 | en | - |
item.fulltext | With Fulltext | - |
item.cerifentitytype | Publications | - |
item.grantfulltext | open | - |
crisitem.journal.journalissn | 0004-637X | - |
crisitem.journal.ance | E016252 | - |
crisitem.author.dept | O.A. Roma | - |
crisitem.author.dept | O.A. Roma | - |
crisitem.author.dept | O.A. Roma | - |
crisitem.author.dept | O.A. Capodimonte | - |
crisitem.author.dept | O.A. Arcetri | - |
crisitem.author.dept | O.A. Palermo | - |
crisitem.author.dept | O.A. Arcetri | - |
crisitem.author.dept | O.A. Palermo | - |
crisitem.author.orcid | 0000-0002-7035-8513 | - |
crisitem.author.orcid | 0000-0002-0666-3847 | - |
crisitem.author.orcid | 0000-0002-9190-0113 | - |
crisitem.author.orcid | 0000-0001-8657-095X | - |
crisitem.author.orcid | 0000-0001-5776-9476 | - |
crisitem.author.orcid | 0000-0001-9297-7748 | - |
crisitem.author.orcid | 0000-0003-2733-5372 | - |
crisitem.author.orcid | 0000-0003-4929-5703 | - |
Appears in Collections: | 1.01 Articoli in rivista |
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File | Description | Size | Format | |
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Giannini_2015_ApJ_798_33.pdf | publisher pdf file | 255.35 kB | Adobe PDF | View/Open |
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