J/A+A/629/A6ivo://CDS.VizieR/J/A+A/629/A6doi:10.26093/cds/vizier.36290006CDSTang X.D.Henkel C.Menten K.M.Gong Y.Martin S.Muehle S.Aalto S.,Muller S.Garcia-Burillo S.Levshakov S.Aladro R.Spaans M.Viti S.,Asiri H.M.Ao Y.P.Zhang J.S.Zheng X.W.Esimbek J.Zhou J.J.2019-08-22T11:49:47Z2019-08-22T09:14:21ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleiradio-astronomyWe derive molecular-gas-phase ^12^C/^13^C isotope ratios for the central few hundred parsecs of the three nearby starburst galaxies NGC253, NGC1068, and NGC4945 making use of the {lambda}~3mm ^12^CN and ^13^CN N=1-0 lines in the ALMA Band 3. The ^12^C/^13^C isotopic ratios derived from the ratios of these lines range from 30 to 67 with an average of 41.6+/-0.2 in NGC253, from 24 to 62 with an average of 38.3+/-0.4 in NGC1068, and from 6 to 44 with an average of 16.9+/-0.3 in NGC4945. The highest ^12^C/^13^C isotopic ratios are determined in some of the outskirts of the nuclear regions of the three starburst galaxies. The lowest ratios are associated with the northeastern and southwestern molecular peaks of NGC253, the northeastern and southwestern edge of the mapped region in NGC1068, and the very center of NGC4945. In the case of NGC 1068, the measured ratios suggest inflow from the outer part of NGC1068 into the circum-nuclear disk through both the halo and the bar. Low ^12^C/^13^C isotopic ratios in the central regions of these starburst galaxies indicate the presence of highly processed material.2019A&A...629A...6Thttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/629/A6CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/629/A6https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/629/A6http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/629/A6https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/629/A6https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/629/A6http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/629/A6GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/629/A6/table1 (Main properties of the galaxies and observational parameters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/629/A6/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/629/A6/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/629/A6/table1?GETtext/xml+votable180.050000true11.8880833-25.28819440.005555555555555556Cone search capability for table J/A+A/629/A6/list (List of fits datacubes)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/629/A6/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/629/A6/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/629/A6/list?GETtext/xml+votable180.050000true40.66954-0.013370.0055555555555555566/16655 17754 43233https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/629/A6?format=asciiRadiodefaultJ/A+A/629/A6/table1Main properties of the galaxies and observational parametersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameGalaxy namemeta.id;meta.maincharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainDistDistance (1)Mpcpos.distancefloatBeam1Beam size, angulararcsecphys.angSizefloatBeam2Beam size, angulararcsecphys.angSize;srcfloatl_Beamp1[~] Limit flag on Beamp1meta.code.errorcharBeamp1Beam size, linearpcphys.angSizeintBeamp2Beam size, linearpcphys.angSize;srcintPAPosition angledegpos.posAngintTypeType (1)src.classcharSimbadSimbad column added by the CDSmeta.ref.urlcharJ/A+A/629/A6/listList of fits datacubesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameGalaxy namemeta.id;meta.maincharRAJ2000Right Ascension of center (J2000)degpos.eq.ra;meta.mainDEJ2000Declination of center (J2000)degpos.eq.dec;meta.mainNxNumber of pixels along X-axismeta.numberintNyNumber of pixels along Y-axismeta.numberintNzNumber of slicesmeta.numberintObs.dateObservation datestime.epoch;obsnullablebFreq? Lower value of frequency intervalGHzem.freq;stat.minfloatnullableBFreq? Upper value of frequency intervalGHzem.freq;stat.maxfloatnullabledFreq? Frequency resolutionHzspect.resolutiondoublenullablebVel? Lower value of velocity intervalkm/sspect.dopplerVelocintnullableBVel? Upper value of velocity intervalkm/sspect.dopplerVelocintnullabledVel? Velocity resolutionkm/sspect.resolutionintnullablesizeSize of FITS fileKibytephys.size;meta.fitsintFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fits