J/A+A/630/A143ivo://CDS.VizieR/J/A+A/630/A143doi:10.26093/cds/vizier.36300143CDSRogantini D.Costantini E.Zeegers S.T.de Vries C.P.Mehdipour M.,de Groot F.Mutschke H.Psaradaki I.Waters L.B.F.M.2022-03-07T07:15:48Z2019-10-09T08:30:22ZCDS support team

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

cds-question@unistra.frinterstellar-mediumatomic-physicsStudying absorption and scattering of X-ray radiation by interstellar dust grains allows us to access the physical and chemical properties of cosmic grains even in the densest regions of the Galaxy. We aim at characterising the dust silicate population which presents clear absorption features in the energy band covered by the Chandra X-ray Observatory. Through these absorption features, in principle, it is possible to infer the size distribution, composition, and structure of silicate in the interstellar medium. In particular, in this work we investigate magnesium and silicon K-edges. We built X-ray extinction models for 15 dust candidates using newly acquired synchrotron measurements. These models were adapted for astrophysical analysis and implemented in the Spex spectral fitting program. We used the models to reproduce the dust absorption features observed in the spectrum of the bright low mass X-ray binary GX 3+1, which is used as a background source. With the simultaneous analysis of the two edges we test two different size distributions of dust: one corresponding to the standard Mathis-Rumpl-Nordsieck model and one considering larger grains (n(a){prop.to}a_i_^-3.5^ with 0.005{mu}m<a_1_<0.25{mu}m and 0.05{mu}m<a_2_<0.5{mu}m, respectively, with a the grain size). These distributions may be representative of the complex Galactic region towards this source. We find that up to 70% of dust is constituted by amorphous olivine. We discuss the crystallinity of the cosmic dust found along this line of sight. Both magnesium and silicon are highly depleted into dust ({delta}_Z_=0.89 and 0.94, respectively), while their total abundance does not depart from solar values.2019A&A...630A.143Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/630/A143CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+A/627/A16 : Silicon K-edge dust absorption cross sections (Zeegers+, 2019)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/630/A143https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/630/A143http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/630/A143https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/630/A143https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/630/A143http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/630/A143GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/A+A/630/A143/oliv-am*Extinction, scattering and absorption cross sections of olivine amorphous [MgFeSiO4]recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintEEnergy in the Mg K-edge regionkeVphys.energy;obs.fielddoubleExtExtinction cross sectioncm**2.H**-1phys.atmol.crossSectiondoubleScaScattering cross sectioncm**2.H**-1phys.atmol.crossSectiondoubleAbsAbsorption cross sectioncm**2.H**-1phys.atmol.crossSectiondoubleJ/A+A/630/A143/oliv-cr*Extinction, scattering and absorption cross sections of olivine crystalline [Mg1.56Fe0.4Si0.91O4 ]recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintEEnergy in the Mg K-edge regionkeVphys.energy;obs.fielddoubleExtExtinction cross sectioncm**2.H**-1phys.atmol.crossSectiondoubleScaScattering cross sectioncm**2.H**-1phys.atmol.crossSectiondoubleAbsAbsorption cross sectioncm**2.H**-1phys.atmol.crossSectiondoubleJ/A+A/630/A143/fors-cr*Extinction, scattering and absorption cross sections of forsterite crystalline [Mg2FeSiO4]recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintEEnergy in the Mg K-edge regionkeVphys.energy;obs.fielddoubleExtExtinction cross sectioncm**2.H**-1phys.atmol.crossSectiondoubleScaScattering cross sectioncm**2.H**-1phys.atmol.crossSectiondoubleAbsAbsorption cross sectioncm**2.H**-1phys.atmol.crossSectiondoubleJ/A+A/630/A143/enst-cr*Extinction, scattering and absorption cross sections of enstatite crystalline [MgFeSiO3]recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintEEnergy in the Mg K-edge regionkeVphys.energy;obs.fielddoubleExtExtinction cross sectioncm**2.H**-1phys.atmol.crossSectiondoubleScaScattering cross sectioncm**2.H**-1phys.atmol.crossSectiondoubleAbsAbsorption cross sectioncm**2.H**-1phys.atmol.crossSectiondoubleJ/A+A/630/A143/enst-am*Extinction, scattering and absorption cross sections of enstatite amorphous [MgFeSiO3]recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintEEnergy in the Mg K-edge regionkeVphys.energy;obs.fielddoubleExtExtinction cross sectioncm**2.H**-1phys.atmol.crossSectiondoubleScaScattering cross sectioncm**2.H**-1phys.atmol.crossSectiondoubleAbsAbsorption cross sectioncm**2.H**-1phys.atmol.crossSectiondoubleJ/A+A/630/A143/e60f40am*Extinction, scattering and absorption cross sections of En60Fs40 amorphous [Mg0.6Fe0.4SiO3]recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintEEnergy in the Mg K-edge regionkeVphys.energy;obs.fielddoubleExtExtinction cross sectioncm**2.H**-1phys.atmol.crossSectiondoubleScaScattering cross sectioncm**2.H**-1phys.atmol.crossSectiondoubleAbsAbsorption cross sectioncm**2.H**-1phys.atmol.crossSectiondoubleJ/A+A/630/A143/e60f40cr*Extinction, scattering and absorption cross sections of En60fs40 crystalline [Mg0.6Fe0.4SiO3]recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintEEnergy in the Mg K-edge regionkeVphys.energy;obs.fielddoubleExtExtinction cross sectioncm**2.H**-1phys.atmol.crossSectiondoubleScaScattering cross sectioncm**2.H**-1phys.atmol.crossSectiondoubleAbsAbsorption cross sectioncm**2.H**-1phys.atmol.crossSectiondoubleJ/A+A/630/A143/e75f25am*Extinction, scattering and absorption cross sections of En75Fs25 amorphous [Mg0.75Fe0.25SiO3]recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintEEnergy in the Mg K-edge regionkeVphys.energy;obs.fielddoubleExtExtinction cross sectioncm**2.H**-1phys.atmol.crossSectiondoubleScaScattering cross sectioncm**2.H**-1phys.atmol.crossSectiondoubleAbsAbsorption cross sectioncm**2.H**-1phys.atmol.crossSectiondoubleJ/A+A/630/A143/hype-cr*Extinction, scattering and absorption cross sections of Hypersthene crystalline [Mg1.502Fe0.498Si2O6 ]recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintEEnergy in the Mg K-edge regionkeVphys.energy;obs.fielddoubleExtExtinction cross sectioncm**2.H**-1phys.atmol.crossSectiondoubleScaScattering cross sectioncm**2.H**-1phys.atmol.crossSectiondoubleAbsAbsorption cross sectioncm**2.H**-1phys.atmol.crossSectiondoubleJ/A+A/630/A143/e90f10am*Extinction, scattering and absorption cross sections of En90Fs10 amorphous [Mg0.9Fe0.1SiO3]recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintEEnergy in the Mg K-edge regionkeVphys.energy;obs.fielddoubleExtExtinction cross sectioncm**2.H**-1phys.atmol.crossSectiondoubleScaScattering cross sectioncm**2.H**-1phys.atmol.crossSectiondoubleAbsAbsorption cross sectioncm**2.H**-1phys.atmol.crossSectiondoubleJ/A+A/630/A143/e90f10cr*Extinction, scattering and absorption cross sections of En90Fs10 crystalline [Mg0.9Fe0.1SiO3]recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintEEnergy in the Mg K-edge regionkeVphys.energy;obs.fielddoubleExtExtinction cross sectioncm**2.H**-1phys.atmol.crossSectiondoubleScaScattering cross sectioncm**2.H**-1phys.atmol.crossSectiondoubleAbsAbsorption cross sectioncm**2.H**-1phys.atmol.crossSectiondoubleJ/A+A/630/A143/spin-cr*Extinction, scattering and absorption cross sections of Spinel crystalline [MgAl2O4]ScaScattering cross sectioncm**2.H**-1phys.atmol.crossSectiondoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintEEnergy in the Mg K-edge regionkeVphys.energy;obs.fielddoubleExtExtinction cross sectioncm**2.H**-1phys.atmol.crossSectiondoubleAbsAbsorption cross sectioncm**2.H**-1phys.atmol.crossSectiondouble