J/MNRAS/471/3915ivo://CDS.VizieR/J/MNRAS/471/3915doi:10.26093/cds/vizier.74713915CDSJordan C.H.Walsh A.J.Breen S.L.Ellingsen S.P.Voronkov M.A.,Hyland L.J.2024-08-17T20:20:31Z2020-07-22T13:08:30ZCDS support team

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

cds-question@unistra.frsurveysmilky-way-galaxyastrophysical-masersradio-astronomyWe detail interferometric observations of 44GHz class I methanol masers detected by MALT-45 (a 7mm unbiased auto-correlated spectral-line Galactic-plane survey) using the Australia Telescope Compact Array. We detect 238 maser spots across 77 maser sites. Using high-resolution positions, we compare the class I CH_3_OH masers to other star formation maser species, including CS (1-0), SiO v=0 and the H53{alpha} radio-recombination line. Comparison between the cross- and auto-correlated data has allowed us to also identify quasi-thermal emission in the 44GHz class I methanol maser line. We find that the majority of class I methanol masers have small spatial and velocity ranges (<0.5pc and <5km/s), and closely trace the systemic velocities of associated clouds. Using 870{mu}m dust continuum emission from the ATLASGAL survey, we determine clump masses associated with class I masers, and find that they are generally associated with clumps between 1000 and 3000M_{sun}_. For each class I methanol maser site, we use the presence of OH masers and radio recombination lines to identify relatively evolved regions of high-mass star formation; we find that maser sites without these associations have lower luminosities and preferentially appear towards dark infrared regions.2017MNRAS.471.3915Jhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/471/3915CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/448/2344 : MALT-45, a 7mm survey of the southern Galaxy (Jordan+, 2015)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/471/3915https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/471/3915http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/471/3915https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/471/3915https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/471/3915http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/471/3915GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/471/3915/table2 (Observational targets for class I CH_3_OH masers)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/471/3915/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/471/3915/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/471/3915/table2?GETtext/xml+votable180.050000true241.904167-52.5163890.005555555555555556Cone search capability for table J/MNRAS/471/3915/table3 (*Associations with each of the class I CH_3_OH maser sites)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/471/3915/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/471/3915/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/471/3915/table3?GETtext/xml+votable180.050000true241.907917-52.5161920.005555555555555556Cone search capability for table J/MNRAS/471/3915/tablea1 (Gaussian spectral fits for class I CH_3_OH maser spots (including table 4))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/471/3915/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/471/3915/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/471/3915/tablea1?GETtext/xml+votable180.050000true242.74804167-51.840497220.0055555555555555565/10542 6/42158-42159 42172-42173 42216 42501https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/471/3915?format=asciiRadiodefaultJ/MNRAS/471/3915/table2Observational targets for class I CH_3_OH masersSimbadNameSimbad column added by the CDSmeta.idcharnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintName1Paper I site name, GLLL.ll+B.bbmeta.id;meta.maincharn_Name1[*+d ] Note on Name1 (1)meta.notecharName2Refined site name, GLLL.lll+N.bbb (2)meta.idcharRAJ2000Interferometric phase centre right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Interferometric phase centre declination (J2000)pos.eq.dec;meta.mainObs.dateDate on which the site was observedtime.epochnullablermsMedian Off-source image-plane median RMS noise value for the self-calibrated cubemJystat.stdev;instr.det.noise;stat.medianintl_RadLimit flag on Radmeta.code.errorcharRad? Smallest radius of a circle to encompass all emission of the sitearcsecphys.angSize;srcintnullableVmin? Lower value of velocity range (3)km/sphys.veloc;instr.bandwidth;stat.minintnullableVmax? Upper value of velocity range (3)km/sphys.veloc;instr.bandwidth;stat.maxintnullableJ/MNRAS/471/3915/table3*Associations with each of the class I CH_3_OH maser sitesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameRefined region name, GLLL.lll+B.bbb or GLLL.ll+B.bbmeta.id;meta.maincharn_Name[+d ] Note on Name (1)meta.notecharRAJ2000Centre of maser emission right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Centre of maser emission declination (J2000)pos.eq.dec;meta.mainDistKinematic distance (Reid et al. 2009)kpcpos.distancefloate_DistKinematic distance errorkpcstat.errorfloatAssosAssociations with other masers within 1 arcmin (2)meta.id.assoccharSiO[Y/N] Presence of SiO (1-0) v=0?meta.codecharCH3OH[Y/N] Presence of CH_3_OH 1.0.-0.0. A^+^?meta.codecharH53a[Y/N] Presence of H53{alpha}?meta.codecharC34S[Y/N] Presence of C^34^S (1-0)?meta.codecharJ/MNRAS/471/3915/tablea1Gaussian spectral fits for class I CH_3_OH maser spots (including table 4)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSpotSpot name, GLLL.llll+B.bbbbA (1)meta.id;meta.maincharn_Spot[*] * for spots manually fitted (see Section 2.1.1)meta.notecharRAJ2000Right ascension (J2000) (2)pos.eq.ra;meta.maine_RAJ2000Error on right ascensionsstat.error;pos.eq.rafloatDEJ2000Declination (J2000) (2)pos.eq.dec;meta.maine_DEJ2000Error on declinationarcsecstat.error;pos.eq.decfloatSpeakPeak flux density (fitted Gaussian parameters)Jyphot.flux.density;em.radiofloate_SpeakError on SpeakJystat.errorfloatVpeakPeak velocity (fitted Gaussian parameters)km/sphys.veloc;stat.maxdoublee_VpeakError on peak velocitykm/sstat.errorfloatFWHMFWHM (fitted Gaussian parameters)km/sspect.line.widthfloate_FWHMError on FWHMkm/sstat.error;phys.angSizefloatSintIntegrated flux density of the GaussianJy.km/sphot.flux.density;em.radiofloatJ/MNRAS/471/3915/tableb1Gaussian fits for the spectra of thermal lines detected towards class I CH_3_OH maser sites.FWHM1? CS (1-0) parameters, FWHMkm/sspect.line.widthfloatnullableVpeak1? CS (1-0) parameters, peak velocitykm/sspect.dopplerVelocdoublenullablee_Vpeak1? CS (1-0) parameters, peak velocity errorkm/sstat.errorfloatnullableVpeak2? SiO (1-0) v=0 parameters, peak velocitykm/sspect.dopplerVelocfloatnullablee_FWHM1? CS (1-0) parameters, FWHM errorkm/sstat.errorfloatnullableIntI1? CS (1-0) parameters, integrated intensityK.km/sphot.flux.densityfloatnullableIntPeak2? SiO (1-0) v=0 parameters, peak intensity (1)Kspect.line.intensityfloatnullablee_Vpeak2? SiO (1-0) v=0 parameters, peak velocity errorkm/sstat.errorfloatnullableFWHM2? SiO (1-0) v=0 parameters, FWHMkm/sspect.line.widthfloatnullablee_FWHM2? SiO (1-0) v=0 parameters, FWHM errorkm/sstat.errorfloatnullableIntI2? SiO (1-0) v=0 parameters, integrated intensityK.km/sspect.line.intensityfloatnullableIntPeak3? CH_3_OH 1_0_-0_0 parameters, peak intensity (1)Kspect.line.intensityfloatnullablee_IntPeak3? CH_3_OH 1_0_-0_0 parameters, peak intensity errorKstat.errorfloatnullableVpeak3? CH_3_OH 1_0_-0_0 parameters, peak velocitykm/sspect.dopplerVelocfloatnullablee_Vpeak3? CH_3_OH 1_0_-0_0 parameters, peak velocity errorkm/sstat.errorfloatnullablee_FWHM3? CH_3_OH 1_0_-0_0 parameters,, FWHM errorkm/sstat.errorfloatnullableIntI3? CH_3_OH 1_0_-0_0 parameters, integrated intensityK.km/sstat.param;pos.ephemfloatnullablee_IntPeak2? SiO (1-0) v=0 parameters, peak intensity errorKstat.errorfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSite namemeta.id;meta.maincharIntPeak1? CS (1-0) parameters, peak intensity (1)Kspect.line.intensityfloatnullablee_IntPeak1? CS (1-0) parameters, peak intensity errorKstat.errorfloatnullableFWHM3? CH_3_OH 1_0_-0_0 parameters, FWHMkm/sspect.line.widthfloatnullableJ/MNRAS/471/3915/tableb2*Gaussian fits for the spectra of H53{alpha} RRLs detected towards class I CH_3_OH maser sitesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSite namemeta.id;meta.maincharIpeakPeak intensity (fitted Gaussian parameters)Kphot.fluxfloate_IpeakPeak intensity errorKstat.errorfloatVpeakPeak velocity (fitted Gaussian parameters)km/sphys.veloc;stat.maxfloate_VpeakPeak velocity errorkm/sstat.errorfloatFWHMFWHM (fitted Gaussian parameters)km/sspect.line.widthfloate_FWHMFWHM errorkm/sstat.error;phys.angSizefloatIintIntegrated intensityK.km/sphot.flux.densityfloat