J/ApJ/728/104ivo://CDS.VizieR/J/ApJ/728/104doi:10.26093/cds/vizier.17280104CDSSantos F.P.Corradi W.Reis W.2017-11-29T11:49:09Z2012-10-22T12:45:59ZCDS support team

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

cds-question@unistra.frpolarimetryinterstellar-mediumThe Sun is located inside an extremely low density and quite irregular volume of the interstellar medium, known as the Local Cavity (LC). It has been widely believed that some kind of interaction could be occurring between the LC and Loop I, a nearby superbubble seen in the direction of the Galactic center. As a result of such interaction, a wall of neutral and dense material, surrounded by a ring-shaped feature, would be formed at the interaction zone. Evidence of this structure was previously observed by analyzing the soft X-ray emission in the direction of Loop I. Our goal is to investigate the distance of the proposed annular region and map the geometry of the Galactic magnetic field in these directions. On that account, we have conducted an optical polarization survey of 878 stars from the Hipparcos catalog. Our results suggest that the structure is highly twisted and fragmented, showing very discrepant distances along the annular region: ~100pc on the left side and 250pc on the right side, independently confirming the indication from a previous photometric analysis. In addition, the polarization vectors' orientation pattern along the ring also shows a widely different behavior toward both sides of the studied feature, running parallel to the ring contour on the left side and showing no relation to its direction on the right side. Altogether, these evidences suggest a highly irregular nature, casting some doubt on the existence of a unique large-scale ring-like structure.2011ApJ...728..104Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/728/104CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/405/2570 : Linear polarization of nearby bright stars (Bailey+, 2010)J/A+A/346/955 : Magnetic field around the Local Bubble (Leroy, 1999)J/A+AS/101/551 : Optical polarization of 1000 stars (Leroy 1993)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/728/104https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/728/104http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/728/104https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/728/104https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/728/104http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/728/104GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/728/104/table1 (Polarimetric data obtained at OPD)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/728/104/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/728/104/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/728/104/table1?GETtext/xml+votable180.050000true270.4512433-36.37786250.0055555555555555565/7845 8231 8238 8244 8267 6/24592 24625 24638 24645 24661 24672 24680 24687 24689 24785 24795 24840 24844 24848 24851 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47531 47532 47535 47546 47555 47564 47584 47591 47592 47596 47602 47608 47611 47706 47711 47718 47719 47723 47725 47734 47738 47739 47740 47797 47811 47820 47821 47824 47825 47829 47830 47834 47837 47841 47859 47874 47889 47894 47903 47920 47933 47949 47953 47956 47966 47982 47995 48012 48080 48094 48113 48114 48120 48121 48642 48654 48674 48690 48712 48713 48714 48737 48749 48751 48773 48796 48811 48847 48856 48865 48871 48873 48882 48883 48884 48889https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/728/104?format=asciiOpticaldefaultJ/ApJ/728/104/table1Polarimetric data obtained at OPDrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHIPHipparcos identifiermeta.id;meta.mainintGLONGalactic longitudedegpos.galactic.lonGLATGalactic latitudedegpos.galactic.latfloatDistHipparcos trigonometric distancepcpos.distance;pos.heliocentricintPVPolarization degree in V band%phys.polarization.linearfloate_PVUncertainty in PV%stat.errorfloatPAGalactic polarization angledegpos.posAng;phys.polarizationfloate_PAUncertainty in PAdegstat.errorfloatSimbadSimbad column added by the CDSmeta.refchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.main