J/ApJ/947/54ivo://CDS.VizieR/J/ApJ/947/54CDSXu Y.Hao C.J.Liu D.J.Lin Z.H.Bian S.B.Hou L.G.Li J.J.,Li Y.J.2025-06-18T07:37:58Z2025-06-18T08:24:30ZCDS support team

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

cds-question@unistra.frstar-forming-regionsinterferometryastrophysical-masersradio-astronomyvisible-astronomytrigonometric-parallaxproper-motionsmilky-way-galaxygalaxy-classification-systemsgalaxiesIn spite of much work, the overall spiral structure morphology of the Milky Way remains somewhat uncertain. In the last two decades, accurate distance measurements have provided us with an opportunity to solve this issue. Using the precise locations of very young objects, for the first time, we propose that our galaxy has a multiple-arm morphology that consists of two-arm symmetry (the Perseus and Norma Arms) in the inner parts and that extends to the outer parts, where there are several long, irregular arms (the Centaurus, Sagittarius, Carina, Outer, and Local Arms).2023ApJ...947...54Xhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/947/54CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVIII/39 : Composite CO Survey of the Milky Way (Dame+ 1987)II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)J/A+A/397/133 : Star-forming complexes in the Galaxy (Russeil+, 2003)J/A+A/569/A125 : Spiral structure of the Milky Way (Hou+, 2014)J/ApJ/798/L27 : CO obs. of MoCs in the 2nd quadrant (Sun+, 2015)J/ApJS/224/7 : CO obs. of the outer arm in the 2nd quadrant (Du+, 2016)J/A+A/594/A116 : HI4PI spectra and column density maps (HI4PI team+, 2016)J/A+A/616/A10 : Open clusters GaiaDR2 HR diag. (Gaia Collaboration, 2018)J/A+A/616/L15 : Parallaxes and Proper Motions of OB stars (Xu+, 2018)J/other/RAA/18.146 : Spiral structure of the Milky Way (Xu+, 2018)J/ApJ/885/131 : High-mass SFR plx & proper motion with VLBI (Reid+, 2019)J/A+A/652/A102 : 3794 open clusters parameters (Hao+, 2021)J/A+A/651/A104 : Spiral arms Gaia EDR3 (Poggio+, 2021)J/A+A/645/L8 : Plxs & proper motions of OB stars from Gaia (Xu+, 2021)J/A+A/661/A118 : Open clusters found with OCfinder (Castro-Ginard+, 2022)J/A+A/660/A4 : Gaia EDR3 new Galactic open clusters (Hao+, 2022)http://www.sdss.org/ : SDSS home pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/947/54https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/947/54http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/947/54https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/947/54https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/947/54http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/947/54GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/947/54/table1 (The astrometric parameters of high-mass star-forming region (HMSFR) masers)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/947/54/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/947/54/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/947/54/table1?GETtext/xml+votable180.050000true197.82038-62.765280.005555555555555556Cone search capability for table J/ApJ/947/54/tableb1 (The properties of the external MW-like galaxies; see Appendix B)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/947/54/tableb1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/947/54/tableb1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/947/54/tableb1?GETtext/xml+votable180.050000true134.1688858-67.87037060.0055555555555555566/12 225 227 517 528 556 564 688 697 747 888 936 948 1225 1307 1340 1470 2052 2142 2163 2355 2362 2368 2370 2406 2452 2533 2704 2788 2792 2973 3011 3061 3262 3303 3311 3431 3553 3649 4453 4733 4794 5309 5428 6129 6188 6668 7292 7506 7742 7972 7980 8064 8106 8113-8114 8122 8169 8287 8458 9720 10216 10530 11258 11389 11424 11582 11724 11734 11832 12122 12185 12354 12835 13316 13385 13704 13726 13903 13925 14063 14241 14280 14287 14302 14309 14314 14317 14353-14356 14594 14604 14611 14618 14621-14622 14625-14626 14640 14643 14655 14671 14674 14689 14692 14704 14851 15061 15390 15409 15429 15452 15458 15473 15671 15676 15681 15683 15759 15881 16194 16531 16886 17780 19528 19877 19889 20031 20226 20231 20314 20392 20672 20865 21028 21242 21439 21458 21510 21542 21584 22082 22212 22488 22650 23030 23344 23349 23764 23795 23969 24027 24189 24236 24325 24362 24499 24507 24554 24735 25029 25051 25053 25135 25344 25485 25491 25523 25635 25715 25734 25763 25862 26104 26758 27480 27601 27646 27784 28234 28279 28463 28579 28825 28827 28830-28831 28875 28912-28913 28917-28919 29091-29092 29094 29096-29097 29100-29101 29103 29113-29114 29116 29118 29154 29160 29461 29504 29510-29511 29513 29522 29529 29532-29534 30057 30218-30219 30244-30245 30256 30258-30259 30262-30263 30268-30269 30312-30313 30315 30317-30319 30328 30330 30405 30416 30420 30425 30595 30600-30601 30604 30616-30618 30622 30644 30691-30692 30694 30715 30719 32320 32522 32584 32713 32729 33146 33271 34352 34417 34859 35112 35132 35304 35746 36081 36134 36166 36261 36377 36713 36990 37118 37282 38139 38313 38655 38872 39895 39905 40210 40437 40612 41270 41369 41655 42027 42207 42436 42457 42923 43305 43324 43526 43940 43954 44104 44168 44200 44203 44660 44866 44900 45362 45418 45430 45486 45617 45801 45992 46357 46651 46659 46689 46812 47049 47053 47162 47381 48283 48292https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/947/54?format=asciiOpticalRadiodefaultJ/ApJ/947/54/table1The astrometric parameters of high-mass star-forming region (HMSFR) masersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSource namemeta.id;meta.maincharAliasAlias namemeta.idcharRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainplx[0.049/2.5] Trigonometric Parallax (1)maspos.parallax.trigfloatArmSpiral arm designator (3)obs.fieldchare_plx[0.005/0.2] Uncertainty in plxmasstat.error;pos.parallaxfloatpmE[-6.9/3.2] Eastward Proper Motion; motion in RA multiplied by cos(Dec) (2)mas/yrpos.pmfloate_pmE[0.06/3.1] Uncertainty in pmEmas/yrstat.error;pos.pmfloatpmN[-9.4/2.7] Northward Proper Motion (2)mas/yrpos.pmfloate_pmN[0.1/3.71] Uncertainty in pmNmas/yrstat.error;pos.pmfloatVLSR[-76/121] Local Standard of Rest velocity (2)km/sphys.veloc;pos.lsrinte_VLSR[3/40] Uncertainty in VLSRkm/sstat.error;phys.veloc;pos.lsrintRefReference(s) designators (see refs.dat file)meta.bibcharR19Display data from Reid+ 2019, J/ApJ/885/131 if anymeta.ref.urlintnullableSimbadNameSimbad column added by the CDSmeta.idcharnullableJ/ApJ/947/54/tableb1The properties of the external MW-like galaxies; see Appendix BSimbadSimbad column added by the CDSmeta.ref.urlcharNEDNED column added by the CDSmeta.ref.urlcharLEDAmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameName of the external galaxymeta.id;meta.maincharMTypeMorphological type from SIMBAD database (1)src.morph.typecharDmaj[0.5/6.2] Major diameter of galaxy from SIMBAD databasearcminphys.angSizefloatDmin[0.5/3.6] Minor diameter of galaxy from SIMBAD databasearcminphys.angSizefloatSurveyImage data come from DSS blue band or SDSS DR7 g bandmeta.id;meta.datasetcharEEtypeSpiral arm classes (2)src.morph.paramcharInnerHas inner two arms or not (3)meta.codecharStartInner spiral arms start from end of bar or notmeta.codecharEE87Arm classes in Elmegreen & Elmegreen (1987ApJ...314....3E) (4)meta.code.classchar_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.mainJ/ApJ/947/54/refsReferencesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRefReference codemeta.noteintAuthFirst author's name(s)meta.bib.authorcharBibCodeBibcode of the referencemeta.bib.bibcodecharCatVizieR catalog referencemeta.id;meta.datasetchar