J/ApJS/207/7ivo://CDS.VizieR/J/ApJS/207/7doi:10.26093/cds/vizier.22070007CDSMulas G.Zonca A.Casu S.Cecchi-Pestellini C.2017-07-10T15:23:17Z2013-09-25T08:08:08ZCDS support team

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

cds-question@unistra.frinterstellar-mediumastronomical-modelschemical-abundancesWe investigate the remarkable apparent variety of galactic extinction curves by modeling extinction profiles with core-mantle grains and a collection of single polycyclic aromatic hydrocarbons. Our aim is to translate a synthetic description of dust into physically well-grounded building blocks through the analysis of a statistically relevant sample of different extinction curves. All different flavors of observed extinction curves, ranging from the average galactic extinction curve to virtually "bumpless" profiles, can be described by the present model. We prove that a mixture of a relatively small number (54 species in 4 charge states each) of polycyclic aromatic hydrocarbons can reproduce the features of the extinction curve in the ultraviolet, dismissing an old objection to the contribution of polycyclic aromatic hydrocarbons to the interstellar extinction curve. Despite the large number of free parameters (at most the 54x4 column densities of each species in each ionization state included in the molecular ensemble plus the 9 parameters defining the physical properties of classical particles), we can strongly constrain some physically relevant properties such as the total number of C atoms in all species and the mean charge of the mixture. Such properties are found to be largely independent of the adopted dust model whose variation provides effects that are orthogonal to those brought about by the molecular component. Finally, the fitting procedure, together with some physical sense, suggests (but does not require) the presence of an additional component of chemically different very small carbonaceous grains.2013ApJS..207....7Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/207/7CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/527/A109 : Dust and PAH emission SEDs of disk galaxies (Popescu+, 2011)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/207/7https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/207/7http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/207/7https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/207/7https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/207/7http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/207/7GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/207/7/galExt (Combined table from original tables)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/207/7/galExt?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/207/7/galExt?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/207/7/galExt?GETtext/xml+votable180.050000true5/3869 6/461 859 1039 1044 1055 1060 1102 1124 1134 1293 1329 1431 1460 1539 1550 1777 1799 1814 2909 2940 3004 3057 3244 3256 3257 3258 3263 3283 3301 3312 3384 3585 3600 3608 3796 3798 3842 13214 13289 14015 14173 14213 14245 14249 14251 14273 14305 14311 14368 14641 14643 14645 14646 14653 14655 14690 14737 14741 15369 15372 15399 15406 15481 15484 15485 15486 15519 15611 15625 15663 15682 15683 15686 15687 15689 15692 15842 19009 21428 21438 21439 21483 21638 21644 22033 22208 22240 22243 22246 22249 22253 22258 22264 22805 22854 22855 23410 23488 23637 23644 23647 23982 24228 24230 24325 24331 24333 24463 24513 24552 28759 28890 28891 28916 29040 29095 29138 29463 29522 29876 30287 30334 30356 30366 30709 30818 31121 31169 37145 37333 37334 37871 37887 37897 37938 38016 38018 38024 39174 39243 39272 39281 39334 39774 39796 41129 41134 41650 41651 41660 41692 42226 42383 42394 42395 42503 42947 42959 42967 42977 42980 42981 42985 42989 42994 43027 43030 43033 43036 43040 44366 44378 45105 47656 47739 47742https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/207/7?format=asciidefaultJ/ApJS/207/7/galExtCombined table from original tablesSimbadNameSimbad column added by the CDSmeta.idcharLoSLine of sight identifiermeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNd.sSimple model dust normalization factor (1)stat.fit.paramdoublee_Nd.s? Uncertainty in Nd.s (blank if <10^-6^)stat.errordoublenullablefv.s[0/1] Simple model vacuum fraction of silicate corestat.fit.paramfloate_fv.s? Uncertainty in fv.s (blank if <0.01)stat.errorfloatnullablew.sSimple model total carbonaceous mantle thicknessnmsrc.morph.scLengthfloate_w.s? Uncertainty in w.s (blank if <0.01)nmstat.errorfloatnullablefsp2.sSimple model fraction of sp^2^ (graphitic) material in the carbonaceous mantlestat.fit.paramfloate_fsp2.s? Uncertainty in fsp2.s (blank if <0.01)stat.errorfloatnullableamin.sSimple model small grain lower limitnmsrc.morph.scLengthfloate_amin.s? Uncertainty in amin.s (blank if <0.01)nmstat.errorfloatnullableamax.sSimple model small grain upper limitnmsrc.morph.scLengthfloate_amax.s? Uncertainty in amax.s (blank if <0.01)nmstat.errorfloatnullablebmin.sSimple model big grain lower limitnmsrc.morph.scLengthfloate_bmin.s? Uncertainty in bmin.s (blank if <0.01)nmstat.errorfloatnullablebmax.sSimple model big grain upper limitnmsrc.morph.scLengthfloate_bmax.s? Uncertainty in bmax.s (blank if <0.01)nmstat.errorfloatnullableq.sSimple model power law index q (1)stat.fit.paramfloate_q.s? Uncertainty in q.s (blank if <10^-4^)stat.errorfloatnullablechi2.s? Simple model reduced {chi}^2^ (blank if <0.1)stat.fit.chi2floatnullableNd.dDetailed model dust normalization factor (1)stat.fit.paramdoublee_Nd.d? Uncertainty in Nd (blank if <10^-6^)stat.errordoublenullablefv.dDetailed model vacuum fraction of silicate corestat.fit.paramfloate_fv.d? Uncertainty in fv.d (blank if <0.01)stat.errorfloatnullablew.dDetailed model total carbonaceous mantle thicknessnmsrc.morph.scLengthfloate_w.d? Uncertainty in w (blank if <0.01)nmstat.errorfloatnullablefsp2.dDetailed model fraction of sp^2^ (graphitic) material in the carbonaceous mantlestat.fit.paramfloate_fsp2.d? Uncertainty in fsp2.d (blank if <0.01)stat.errorfloatnullableamin.dDetailed model small grain miner limitnmsrc.morph.scLengthfloate_amin.d? Uncertainty in amin.d (blank if <0.01)nmstat.errorfloatnullableamax.dDetailed model small grain upper limitnmsrc.morph.scLengthfloate_amax.d? Uncertainty in amax.d (blank if <0.01)nmstat.errorfloatnullablebmin.dDetailed model big grain miner limitnmsrc.morph.scLengthfloate_bmin.d? Uncertainty in bmin.d (blank if <0.01)nmstat.errorfloatnullablebmax.dDetailed model big grain upper limitnmsrc.morph.scLengthfloate_bmax.d? Uncertainty in bmax.d (blank if <0.01)nmstat.errorfloatnullableq.dDetailed.d model power law indexstat.fit.paramdoublee_q.d? Uncertainty in q.dstat.errorfloatnullablechi2.d? Detailed model reduced {chi}^2^ (blank if <0.1)stat.fit.chi2floatnullableSi/H1sSmall grain Si/H abundance (simple model)(10-6)phys.abundfloate_Si/H1s? Uncertainty in Si/H1s (blank if <0.1)(10-6)stat.errorfloatnullableSi/H2sLarge grain Si/H abundance (simple model)(10-6)phys.abundfloate_Si/H2s? Uncertainty in Si/H2s (blank if <0.1)(10-6)stat.errorfloatnullableSi/H.sTotal grain Si/H abundance (simple model)(10-6)phys.abundfloate_Si/H.s? Uncertainty in Si/H.s (blank if <0.1)(10-6)stat.error;phys.abundfloatnullableC/H1sSmall grain C/H abundance (simple model)(10-6)phys.abundfloate_C/H1s? Uncertainty in C/H1s (blank if <0.1)(10-6)stat.errorfloatnullableC/H2sLarge grain C/H abundance (simple model)(10-6)phys.abundfloate_C/H2s? Uncertainty in C/H2s (blank if <0.1)(10-6)stat.errorfloatnullableC/H3sPAH C/H abundance (simple model)(10-6)phys.abundfloate_C/H3s? Uncertainty in C/H3s (blank if <0.1)(10-6)stat.errorfloatnullableC/H.sTotal grain+PAH C/H abundance (simple model)(10-6)phys.abundfloate_C/H.s? Uncertainty in C/H.s (blank if <0.1)(10-6)stat.error;phys.abundfloatnullableSi/H1dsmall grain Si/H abundance (detailed model)(10-6)phys.abundfloate_Si/H1d? Uncertainty in Si/H1d (blank if <0.1)(10-6)stat.errorfloatnullableSi/H2dlarge grain Si/H abundance (detailed model)(10-6)phys.abundfloate_Si/H2d? Uncertainty in Si/H2d (blank if <0.1)(10-6)stat.errorfloatnullableSi/H.dtotal grain Si/H abundance (detailed model)(10-6)phys.abundfloate_Si/H.d? Uncertainty in Si/H.d (blank if <0.1)(10-6)stat.error;phys.abundfloatnullableC/H1dsmall grain C/H abundance (detailed model)(10-6)phys.abundfloate_C/H1d? Uncertainty in C/H1d (blank if <0.1)(10-6)stat.errorfloatnullableC/H2dlarge grain C/H abundance (detailed model)(10-6)phys.abundfloate_C/H2d? Uncertainty in C/H2d (blank if <0.1)(10-6)stat.errorfloatnullableC/H3dPAH grain C/H abundance (detailed model)(10-6)phys.abundfloate_C/H3d? Uncertainty in C/H3d (blank if <0.1)(10-6)stat.errorfloatnullableC/H.dtotal grain+PAH C/H3d abundance (detailed model)(10-6)phys.abundfloate_C/H.d? Uncertainty in C/H.d (blank if <0.1)(10-6)stat.error;phys.abundfloatnullable<Q>/NcAverage charge per C atom (in e^-^)phys.atmol.ionStagefloate_<Q>/NcUncertainty in <Q>/Nc (in e^-^)stat.errorfloatsQ/NcRMS dispersion in charge per C atom (in e^-^)stat.variancefloate_sQ/NcUncertainty in sQ/Nc (in e^-^)stat.errorfloat_RAPosition of the line of sight, from Simbad (right ascension part)degpos.eq.ra;meta.mainnullable_DEPosition of the line of sight, from Simbad (declination part)degpos.eq.dec;meta.mainnullable