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<ri:Resource created="2014-10-03T10:06:42Z" status="active" updated="2025-05-19T09:50:00Z" version="1.2" xmlns:cs="http://www.ivoa.net/xml/ConeSearch/v1.0" xmlns:ri="http://www.ivoa.net/xml/RegistryInterface/v1.0" xmlns:vr="http://www.ivoa.net/xml/VOResource/v1.0" xmlns:vs="http://www.ivoa.net/xml/VODataService/v1.1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.ivoa.net/xml/ConeSearch/v1.0 http://vo.ari.uni-heidelberg.de/docs/schemata/ConeSearch.xsd http://www.ivoa.net/xml/VOResource/v1.0 http://vo.ari.uni-heidelberg.de/docs/schemata/VOResource.xsd http://www.ivoa.net/xml/VODataService/v1.1 http://vo.ari.uni-heidelberg.de/docs/schemata/VODataService.xsd" xsi:type="vs:CatalogService"><title>Spiral structure of the Milky Way</title><shortName>J/A+A/569/A125</shortName><identifier>ivo://CDS.VizieR/J/A+A/569/A125</identifier><altIdentifier>doi:10.26093/cds/vizier.35690125</altIdentifier><curation><publisher ivo-id="ivo://CDS">CDS</publisher><creator><name>Hou L.G.</name></creator><creator><name>Han J.L.</name></creator><date role="Updated">2015-02-16T19:43:56Z</date><date role="Created">2014-10-03T10:06:42Z</date><contact><name>CDS support team</name><address>CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France</address><email>cds-question@unistra.fr</email></contact></curation><content><subject>milky-way-galaxy</subject><subject>galaxy-planes</subject><subject>h-ii-regions</subject><subject>astrophysical-masers</subject><subject>radio-astronomy</subject><subject>molecular-clouds</subject><subject>astronomical-models</subject><description>We have updated the catalogs of Galactic HII regions, giant molecular clouds (GMCs), and 6.7-GHz methanol masers to outline the spiral structure of our Galaxy. The related parameters have been collected and (re)calculated based on the data in the literature. In particular, for each spiral tracer, we list the photometric or trigonometric distance, and/or the solutions of the kinematic distance ambiguity (KDA) when available. The kinematic distances when adopted are calculated using a flat rotation curve with two sets of R_0_, {Theta}_0_, and solar motions, where one set is the IAU standard and the other is from the new observational results. The rotation curve of Brand &amp; Blitz (1993, Cat. J/A+A/275/67) is also used to derive the kinematic distances.</description><source format="bibcode">2014A&amp;A...569A.125H</source><referenceURL>https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/569/A125</referenceURL><type>Catalog</type><contentLevel>Research</contentLevel><relationship><relationshipType>IsServedBy</relationshipType><relatedResource ivo-id="ivo://CDS.VizieR/TAP">TAP VizieR generic service</relatedResource></relationship><relationship><relationshipType>IsServedBy</relationshipType><relatedResource>Conesearch service</relatedResource></relationship><relationship><relationshipType>related-to</relationshipType><relatedResource ivo-id="ivo://CDS.VizieR/J/A+A/275/67">J/A+A/275/67 : Velocity Field of the outer Galaxy (Brand+ 1993)</relatedResource></relationship></content><rights>https://cds.unistra.fr/vizier-org/licences_vizier.html</rights><capability><interface xsi:type="vr:WebBrowser"><accessURL 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Uncertainty in Dist</description><unit>kpc</unit><ucd>stat.error</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>r_Dist</name><description>Reference for Dist and e_Dist</description><ucd>meta.ref;pos.frame</ucd><dataType xsi:type="vs:VOTableType" arraysize="8*">char</dataType></column><column><name>n_Dist</name><description>KDA resolution (G1)</description><ucd>meta.note</ucd><dataType xsi:type="vs:VOTableType" arraysize="5*">char</dataType></column><column><name>Ref</name><description>Reference(s) and notes</description><ucd>meta.ref;pos.frame</ucd><dataType xsi:type="vs:VOTableType" arraysize="28*">char</dataType></column><column><name>R8.5</name><description>[1.6/29]? Distance to the GC (G2)</description><unit>kpc</unit><ucd>pos.distance</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>D8.5</name><description>[0.4/24]? Distance to the Sun (G2)</description><unit>kpc</unit><ucd>pos.distance;pos.heliocentric</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>M8.5</name><description>[0.02/263]? Mass of the GMC (G2)</description><unit>100000solMass</unit><ucd>phys.mass</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>R8.3</name><description>[1.6/24]? Distance to the GC (G3)</description><unit>kpc</unit><ucd>pos.distance</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>D8.3</name><description>[0.1/22]? Distance to the Sun (G3)</description><unit>kpc</unit><ucd>pos.distance;pos.heliocentric</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>M8.3</name><description>[0/262]? Mass of the GMC (G3)</description><unit>100000solMass</unit><ucd>phys.mass</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>Rbb93</name><description>[1.1/31]? Distance to the GC (G)</description><unit>kpc</unit><ucd>pos.distance</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>Dbb93</name><description>[0.6/24]? Distance to the Sun (G)</description><unit>kpc</unit><ucd>pos.distance;pos.heliocentric</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>Mbb93</name><description>[0/263]? Mass of the GMC (G)</description><unit>100000solMass</unit><ucd>phys.mass</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>_RA.icrs</name><description>Right ascension (ICRS) (computed by VizieR, not part of the original data)</description><unit>deg</unit><ucd>pos.eq.ra</ucd><flag>nullable</flag><flag>indexed</flag></column><column><name>_DE.icrs</name><description>Declination (ICRS) (computed by VizieR, not part of the original data)</description><unit>deg</unit><ucd>pos.eq.dec</ucd><flag>nullable</flag><flag>indexed</flag></column></table><table><name>J/A+A/569/A125/tablea3</name><description>6.7-GHz methanol masers</description><column><name>recno</name><description>Record number assigned by the VizieR team. Should Not be used for identification.</description><ucd>meta.record</ucd><dataType xsi:type="vs:VOTableType">int</dataType></column><column><name>GLON</name><description>Galactic longitude</description><unit>deg</unit><ucd>pos.galactic.lon</ucd></column><column><name>GLAT</name><description>Galactic latitude</description><unit>deg</unit><ucd>pos.galactic.lat</ucd></column><column><name>VLSRm</name><description>[-129/154]? Median velocity of the maser lines</description><unit>km/s</unit><ucd>spect.dopplerVeloc</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>VLSRp</name><description>[-132/157]? Peak velocity of the maser lines</description><unit>km/s</unit><ucd>spect.dopplerVeloc</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>r_V</name><description>Reference for GLON, GLAT and VLSR</description><ucd>meta.ref</ucd><dataType xsi:type="vs:VOTableType" arraysize="6*">char</dataType></column><column><name>Dist</name><description>[0.4/12]? Photometric/trigonometric distance</description><unit>kpc</unit><ucd>pos.distance;pos.heliocentric</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>e_Dist</name><description>? Uncertainty in Dist</description><unit>kpc</unit><ucd>stat.error</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>r_Dist</name><description>Reference for Dist</description><ucd>meta.ref;pos.frame</ucd><dataType xsi:type="vs:VOTableType" arraysize="6*">char</dataType></column><column><name>n_Dist</name><description>KDA resulition (G1)</description><ucd>meta.note</ucd><dataType xsi:type="vs:VOTableType" arraysize="5*">char</dataType></column><column><name>Ref</name><description>Reference(s) and notes</description><ucd>meta.ref;pos.frame</ucd><dataType xsi:type="vs:VOTableType" arraysize="37*">char</dataType></column><column><name>R8.5</name><description>[2.5/29]? Distance to the GC (G2)</description><unit>kpc</unit><ucd>pos.distance</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>D8.5</name><description>[0.1/37]? Distance to the Sun (G2)</description><unit>kpc</unit><ucd>pos.distance;pos.heliocentric</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>R8.3</name><description>[2.6/26]? Distance to the GC (G3)</description><unit>kpc</unit><ucd>pos.distance</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>D8.3</name><description>[0/35]? Distance to the Sun (G3)</description><unit>kpc</unit><ucd>pos.distance;pos.heliocentric</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>Rbb93</name><description>[2.5/30]? Distance to the GC (G4)</description><unit>kpc</unit><ucd>pos.distance</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>Dbb93</name><description>[0/39]? Distance to the Sun (G4)</description><unit>kpc</unit><ucd>pos.distance;pos.heliocentric</ucd><dataType xsi:type="vs:VOTableType">float</dataType><flag>nullable</flag></column><column><name>_RA.icrs</name><description>Right ascension (ICRS) (computed by VizieR, not part of the original data)</description><unit>deg</unit><ucd>pos.eq.ra</ucd><flag>nullable</flag><flag>indexed</flag></column><column><name>_DE.icrs</name><description>Declination (ICRS) (computed by VizieR, not part of the original data)</description><unit>deg</unit><ucd>pos.eq.dec</ucd><flag>nullable</flag><flag>indexed</flag></column></table><table><name>J/A+A/569/A125/refs</name><description>References</description><column><name>Com</name><description>Comments</description><ucd>meta.note</ucd><dataType xsi:type="vs:VOTableType" arraysize="101*">char</dataType></column><column><name>Ref</name><description>Reference code</description><ucd>meta.note</ucd><dataType xsi:type="vs:VOTableType" arraysize="7*">char</dataType></column><column><name>Aut</name><description>Author's name</description><ucd>meta.bib.author</ucd><dataType xsi:type="vs:VOTableType" arraysize="25*">char</dataType></column><column><name>recno</name><description>Record number assigned by the VizieR team. Should Not be used for identification.</description><ucd>meta.record</ucd><dataType xsi:type="vs:VOTableType">int</dataType></column><column><name>Bibcode</name><description>Bibcode</description><ucd>meta.bib.bibcode</ucd><dataType xsi:type="vs:VOTableType" arraysize="19*">char</dataType></column></table></schema></tableset></ri:Resource>