J/ApJ/953/21ivo://CDS.VizieR/J/ApJ/953/21doi:10.26093/cds/vizier/ba-xs-nCDSHyland L.J.Reid M.J.Orosz G.Ellingsen S.P.Weston S.D.Kumar J.,Dodson R.Rioja M.J.Hankey W.J.Yates-Jones P.M.Natusch T.,Gulyaev S.Menten K.M.Brunthaler A.2026-07-02T12:00:19Z2025-10-31T09:13:56ZCDS support team

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

cds-question@unistra.frinterferometryastrophysical-masersradio-astronomyWe present the first results from the Southern Hemisphere Parallax Interferometric Radio Astrometry Legacy Survey: 10{mu}as accurate parallaxes and proper motions for two Southern Hemisphere 6.7GHz methanol masers obtained using the inverse MultiView calibration method. Using an array of radio telescopes in Australia and New Zealand, we measured trigonometric parallaxes and proper motions for the masers associated with the star formation region G232.62+00.99 of {pi}=0.610+/-0.011mas, {mu}_x_=-2.266+/-0.021mas/yr, and {mu}_y_=2.249+/-0.049mas/yr, which implies its distance to be d=1.637+/-0.029kpc. These measurements represent an improvement in accuracy by more than a factor of 3 over the previous measurements obtained through Very Long Baseline Array observations of the 12GHz methanol masers associated with this region. We also measure the trigonometric parallax and proper motion for G323.74-00.26 as {pi}=0.364+/-0.009mas, {mu}_x_=-3.239+/-0.025mas/yr, and {mu}_y_=-3.976+/-0.039mas/yr, which implies a distance of d=2.747+/-0.068kpc. These are the most accurate measurements of trigonometric parallax obtained for 6.7GHz class II methanol masers to date. We confirm that G232.62+00.99 is in the Local Arm and find that G323.74-00.26 is in the Scutum-Centaurus arm. We also investigate the structure and internal dynamics of both masers.2023ApJ...953...21Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/953/21CatalogResearchIsServedByTAP VizieR generic servicerelated-toVIII/96 : 6-GHz methanol multibeam maser catalogue (Caswell+, 2010-12)J/A+AS/25/25 : HII regions of the Northern Milky Way (Dubout-Crillon+ 1976)J/MNRAS/377/571 : GLIMPSE methanol masers non-detections (Ellingsen+, 2007)J/ApJ/783/130 : Parallaxes of high mass star forming regions (Reid+, 2014)J/MNRAS/485/88 : Southern compact extragalactic radio sources (Petrov+, 2019)J/ApJ/885/131 : ~200 high-mass SFR plx & PMs with VLBI (Reid+, 2019)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/953/21https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/953/21http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/953/21https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/953/21https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/953/21http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/953/21GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapRadiodefaultJ/ApJ/953/21/fig1Auto- and cross-correlated spectra of G232.62+00.99 maser emission at epoch 6recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintVel[-27.3/60.4] Velocitykm/sphys.velocfloatAuto[639.5/887.5] Scalar-averaged, autocorrelated baseline flux density for all telescopesJyphot.flux.density;em.radio.6-12GHzfloatCd-Hb[17.3/73] Ceduna 30m and Hobart 12m baseline flux densityJyphot.flux.density;em.radio.6-12GHzfloatCd-Ke[17.8/87] Ceduna 30m and Katherine 12m baseline flux densityJyphot.flux.density;em.radio.6-12GHzfloatCd-Wa[7.9/40] Ceduna 30m and Warkworth 30m baseline flux densityJyphot.flux.density;em.radio.6-12GHzfloatHb-Ke[34.8/45.4] Hobart 12m and Katherine 12m baseline flux densityJyphot.flux.density;em.radio.6-12GHzfloatHb-Wa[15.7/55.2] Hobart 12m and Warkworth 30m baseline flux densityJyphot.flux.density;em.radio.6-12GHzfloatKe-Wa[16/28] Katherine 12m and Warkworth 30m baseline flux densityJyphot.flux.density;em.radio.6-12GHzfloatJ/ApJ/953/21/fig2Auto- and cross-correlated spectra of G323.74-00.26 maser emission at epoch 4.recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintVel[-94/-6.1] Velocitykm/sphys.velocfloatAuto[625/3699] Scalar-averaged, autocorrelated baseline flux density for all telescopesJyphot.flux.density;em.radio.6-12GHzfloatCd-Hb[35.2/520.4] Ceduna 30m and Hobart 12m baseline flux densityJyphot.flux.density;em.radio.6-12GHzfloatCd-Ke[31/549.1] Ceduna 30m and Katherine 12m baseline flux densityJyphot.flux.density;em.radio.6-12GHzfloatCd-Wa[10.8/601] Ceduna 30m and Warkworth 30m baseline flux densityJyphot.flux.density;em.radio.6-12GHzfloatHb-Ke[88.5/313.4] Hobart 12m and Katherine 12m baseline flux densityJyphot.flux.density;em.radio.6-12GHzfloatHb-Wa[31.7/626.1] Hobart 12m and Warkworth 30m baseline flux densityJyphot.flux.density;em.radio.6-12GHzfloatKe-Wa[27.7/355] Katherine 12m and Warkworth 30m baseline flux densityJyphot.flux.density;em.radio.6-12GHzfloatJ/ApJ/953/21/fig7Map of methanol maser spots in G232.62+00.99 and their proper motions relative to the reference spot at (0,0)Vel[21.8/23.1] Spot LoS velocitykm/sphys.velocfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintXX coordinate positionmaspos.distance;pos.cartesian.xfloatYY coordinate positionmaspos.distance;pos.cartesian.ydoubleVxX position spot velocitymas/yrphys.veloc;pos.cartesian.xfloatVyY position spot velocitymas/yrphys.veloc;pos.cartesian.yfloatI[2/77.5] Spot flux densityJyphot.flux.density;em.radio.6-12GHzfloatJ/ApJ/953/21/fig8Map and dynamics of maser spots in G323.74-00.26recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintVel[-53.52/-47.8] Spot LoS velocitykm/sphys.velocfloatXX coordinate positionmaspos.distance;pos.cartesian.xdoubleYY coordinate positionmaspos.distance;pos.cartesian.yfloatVxX position spot velocitymas/yrphys.veloc;pos.cartesian.xfloatVyY position spot velocitymas/yrphys.veloc;pos.cartesian.yfloatI[1.39/438] Spot flux densityJyphot.flux.density;em.radio.6-12GHzfloat