J/ApJ/780/110ivo://CDS.VizieR/J/ApJ/780/110doi:10.26093/cds/vizier.17800110CDSGrieve M.F.R.Ramsbottom C.A.Hudson C.E.Keenan F.P.2018-01-30T07:18:08Z2015-07-10T07:56:32ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.fratomic-physicsWe present Maxwellian-averaged effective collision strengths for the electron-impact excitation of SIII over a wide range of electron temperatures of astrophysical importance, log T_e_(K)=3.0-6.0. The calculation incorporates 53 fine-structure levels arising from the six configurations--3s^2^3p^2^, 3s3p^3^, 3s^2^3p3d, 3s^2^3p4s, 3s^2^3p4p, and 3s^2^3p4d--giving rise to 1378 individual lines and is undertaken using the recently developed RMATRX II plus FINE95 suite of codes. A detailed comparison is made with a previous R-matrix calculation and significant differences are found for some transitions. The atomic data are subsequently incorporated into the modeling code CLOUDY to generate line intensities for a range of plasma parameters, with emphasis on allowed ultraviolet extreme-ultraviolet emission lines detected from the Io plasma torus. Electron density-sensitive line ratios are calculated with the present atomic data and compared with those from CHIANTI v7.1, as well as with Io plasma torus spectra obtained by Far-Ultraviolet Spectroscopic Explorer and Extreme-Ultraviolet Explorer. The present line intensities are found to agree well with the observational results and provide a noticeable improvement on the values predicted by CHIANTI.2014ApJ...780..110Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/780/110CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/ApJ/526/544 : Collision strengths in S III (Tayal+, 1999)J/A+AS/125/149 : CHIANTI-An Atomic Database For Emission Lines I. (Dere+ 1997)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/780/110https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/780/110http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/780/110https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/780/110https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/780/110http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/780/110GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/ApJ/780/110/table2Index of the SIII fine-structure levelsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIndexLevel indexmeta.idintLevelLevel configurationphys.atmol.configurationJ/ApJ/780/110/table3Effective collision strengths for SIII as a function of temperaturerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordinti[1/52] Lower level index (table 2)meta.idintj[2/53] Upper level index (table 2)meta.idintECS1[0/22.8] Effective collision strength at 1000Kphys.atmol.collStrengthdoubleECS2[0/23.5] Effective collision strength at 1580Kphys.atmol.collStrengthdoubleECS3[0/24.3] Effective collision strength at 2510Kphys.atmol.collStrengthdoubleECS4[0/24.9] Effective collision strength at 3980Kphys.atmol.collStrengthdoubleECS5[0/25.5] Effective collision strength at 6310Kphys.atmol.collStrengthdoubleECS6[0/26.2] Effective collision strength at 10000Kphys.atmol.collStrengthdoubleECS7[0/27.2] Effective collision strength at 15800Kphys.atmol.collStrengthdoubleECS8[0/28.8] Effective collision strength at 25100Kphys.atmol.collStrengthdoubleECS9[0/33] Effective collision strength at 39800Kphys.atmol.collStrengthdoubleECS10[0/44.3] Effective collision strength at 63100Kphys.atmol.collStrengthdoubleECS11[0/61.6] Effective collision strength at 100000Kphys.atmol.collStrengthdoubleECS12[0/87.1] Effective collision strength at 158000Kphys.atmol.collStrengthdoubleECS13[0/123] Effective collision strength at 251000Kphys.atmol.collStrengthdoubleECS14[0/173] Effective collision strength at 398000Kphys.atmol.collStrengthdoubleECS15[0/236] Effective collision strength at 631000Kphys.atmol.collStrengthdoubleECS16[0/303] Effective collision strength at 10^6^Kphys.atmol.collStrengthdouble