J/ApJS/262/42ivo://CDS.VizieR/J/ApJS/262/42doi:10.26093/cds/vizier.22620042CDSLi J.J.Immer K.Reid M.J.Sanna A.Rygl K.L.J.Xu Y.Zhang B.,Brunthaler A.Menten K.M.2023-01-16T09:03:39Z2022-12-16T13:51:47ZCDS support team

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

cds-question@unistra.frstar-forming-regionsastrophysical-masersradio-astronomymilky-way-galaxyvisible-astronomytrigonometric-parallaxproper-motionsradio-sourcesAs part of the Bar and Spiral Structure Legacy (BeSSeL) Survey, we have used the Very Long Baseline Array (VLBA) to measure 16 trigonometric parallaxes and proper motions of molecular masers associated with 14 high-mass star-forming regions in the Scutum arm in the first quadrant of the Milky Way. This increases the number of maser sources with accurate distances in this arm to 42. The Scutum arm can now be traced over a length of ~8kpc and spanning ~100{deg} of Galactic azimuth. We find that the large inward peculiar motions noted by Immer+ (2019A&A...632A.123I) are concentrated near the end of the Galactic bar, while away from the bar modest peculiar motions more typical of spiral arms are seen, strengthening the suggestion that the large motions are induced by the bar.2022ApJS..262...42Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/262/42CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/126/2562 : Second VLBA calibrator survey: VCS2 (Fomalont+, 2003)J/AJ/129/1163 : Third VLBA calibrator survey: VCS3 (Petrov+, 2005)J/ApJS/166/526 : Compact extragalactic radio sources (Xu+, 2006)J/ApJS/194/25 : VLBA calibrator search for the BeSSeL survey (Immer+, 2011)J/ApJ/783/130 : Parallaxes of high mass star forming regions (Reid+, 2014)J/ApJ/885/131 : ~200 high-mass SFR plx & proper motion with VLBI (Reid+, 2019)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/262/42https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/262/42http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/262/42https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/262/42https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/262/42http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/262/42GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/262/42/table1 (Parallaxes and proper motions of sources in the Scutum Arm)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/262/42/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/262/42/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/262/42/table1?GETtext/xml+votable180.050000true266.784-28.77530.005555555555555556Cone search capability for table J/ApJS/262/42/table3 (Positions and brightnesses of the maser spots; see Appendix A)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/262/42/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/262/42/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/262/42/table3?GETtext/xml+votable180.050000true266.7879533333-28.77119833330.0055555555555555566/28822 28828 28830 28919-28920 29068 29070 29091 29097 29102 29270 29507 29510 29529 29558 30218 30220 30255-30256 30258 30262 30269 30306-30307 30314-30315 30401https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/262/42?format=asciiOpticalRadiodefaultJ/ApJS/262/42/table1Parallaxes and proper motions of sources in the Scutum ArmrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameIdentifier of the source (GLLL.ll+BB.bb)meta.id;meta.maincharf_NameFlag on Name (1)meta.codecharGLON[0.31/33.39] Galactic longitudedegpos.galactic.lonGLAT[-0.38/0.22] Galactic latitudedegpos.galactic.latplx[0.113/0.352] Parallaxmaspos.parallax.trigfloate_plx[0.01/0.096] Parallax uncertaintymasstat.error;pos.parallaxfloatDist[2.8/8.8] Distancekpcpos.distance;pos.heliocentricfloate_Dist[0.2/1.8] Lower uncertainty on Distkpcstat.errorfloatE_Dist[0.2/3.1] Upper uncertainty on Distkpcstat.error;stat.maxfloat_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.decnullableindexedmuX[-2.48/0.21] Proper motion in eastward direction ({mu}_x_={mu}_{alpha}cos{delta}_)mas/yrpos.pm;pos.eq.rafloate_muX[0.13/0.45] muX uncertaintymas/yrstat.errorfloatmuY[-5.4/-1.57] Proper motion in northward direction ({mu}_y_={mu}_{delta}_)mas/yrpos.pm;pos.eq.decfloate_muY[0.13/0.64] muY uncertaintymas/yrstat.errorfloatVlsr[10/110] Local Standard of Rest velocitykm/sphys.veloc;pos.lsrinte_Vlsr[3/5] Vlsr uncertaintykm/sstat.error;phys.veloc;pos.lsrintJ/ApJS/262/42/table3Positions and brightnesses of the maser spots; see Appendix ArecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameIdentifier of the sourcemeta.id;meta.maincharf_NameFlag on Name (a=methanol maser; b=water maser)meta.codecharRAJ2000[17/18] Hour of right ascension (J2000) (1)pos.eq.ra;meta.mainDEJ2000Degree of declination (J2000) (1)pos.eq.dec;meta.mainphi[0.5/4.5]? Angular separation between the maser and the calibratordegpos.angDistancefloatnullablebright[0.009/68.9] Peak brightness (1)Jy/beamphot.flux.density;em.radiofloatVlsr[11.6/110.7]? Local Standard of Rest velocitykm/sphys.veloc;pos.lsrfloatnullableBeam1[1.7/9.6] the naturally weighted (NW) beam (1)masphys.angSizefloatBeam2[1.2/4.2] the naturally weighted (NW) beam (1)masphys.angSizefloatPA[-19/40] Position angle, east of north, of the naturally weighted (NW) beam (1)degpos.posAngint