J/MNRAS/478/3693ivo://CDS.VizieR/J/MNRAS/478/3693doi:10.26093/cds/vizier.74783693CDSColzi L.Fontani F.Rivilla V.M.Sanchez-Monge A.Testi L.,Beltran M.T.Caselli P.2024-08-18T20:19:57Z2021-12-10T13:13:01ZCDS support team

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

cds-question@unistra.frinterstellar-mediumstar-forming-regionschemical-abundancesThe fractionation of nitrogen (N) in star-forming regions is a poorly understood process. To put more stringent observational constraints on the N-fractionation, we have observed with the IRAM-30-m telescope a large sample of 66 cores in massive star-forming regions. We targeted the (1-0) rotational transition of HN^13^C, HC^15^N, H^13^CN and HC^15^N, and derived the ^14^N/^15^N ratio for both HCN and HNC. We have completed this sample with that already observed by Colzi et al., and thus analysed a total sample of 87 sources. The ^14^N/^15^N ratios are distributed around the Proto-Solar Nebula value with a lower limit near the TA value (~272). We have also derived the ^14^N/^15^N ratio as a function of the Galactocentric distance and deduced a linear trend based on unprecedented statistics. The Galactocentric dependences that we have found are consistent, in the slope, with past works but we have found a new local ^14^N/^15^N value of ~400, i.e. closer to the Prosolar Nebula value. A second analysis was done, and a parabolic Galactocentric trend was found. Comparison with Galactic chemical evolution models shows that the slope until 8 kpc is consistent with the linear analysis, while the flattening trend above 8 kpc is well reproduced by the parabolic analysis.2018MNRAS.478.3693Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/478/3693CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/478/3693https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/478/3693http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/478/3693https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/478/3693https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/478/3693http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/478/3693GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/478/3693/table2 (List of the observed sources)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/478/3693/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/478/3693/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/478/3693/table2?GETtext/xml+votable180.050000true3.6087564.4788890.0055555555555555566/1470 3068 14255 14307 14309 14317 14353 14594 14622 14655 14670 14693 14697 15676 28918 29103 29113 29116 29118 29461 29509 29513 29529 29532 29535 30218 30244-30245 30262 30269 30312-30313 30319 30405 30417 30420 30425 30594-30595 30604-30605 30618 30694 30712 30716 30718-30719https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/478/3693?format=asciidefaultJ/MNRAS/478/3693/table2List of the observed sourcesSimbadNameSimbad column added by the CDSmeta.idcharnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSourceSource namemeta.id;meta.maincharn_Source[* ] Note on Source (1)meta.notecharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainGLONGalacitc longitudedegpos.galactic.lonGLATGalacitc latitudedegpos.galactic.latfloatDistGalactocentric distance of the source obtained from the distance to the Sun of the associated star-forming regionkpcpos.distancefloatn_Dist[* ] Note ob dist (1)meta.notecharDGCGalactocentric distancekpcpos.distancefloatTex? Excitation temperature (2)Kphys.atmol.excitationintnullablen_Tex[* ] Note on Tex (1)meta.notecharJ/MNRAS/478/3693/table3Total column densities of observed transitions and 14N/15N ratiose_HNC/H15NC? rms uncertainty on HNC/H15NCstat.errorintnullablee_N(HC15N)? rms uncertainty on N(HC15N)1e+11cm**-2stat.errorfloatnullablen_N(HC15N)[t] Note on N(HC15N) (G1)meta.notecharl_HNC/H15NC[<>= ] Limit flag on HNC/H15NCmeta.code.errorcharHNC/H15NC? HNC/H^15^NC ratiophot.flux;arith.ratiointnullablel_HNC/HC13N[<>= ] Limit flag on HNC/HC13Nmeta.code.errorcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSourceSource namemeta.id;meta.maincharl_N(HN13C)[<= ] Limit flag on N(HN13C)meta.code.errorcharN(HN13C)? HN^13^C total column density (beam-averaged) (1)1e+12cm**-2phys.columnDensityfloatnullablee_N(HN13C)? rms uncertainty on N(HN13C)1e+12cm**-2stat.errorfloatnullablel_N(H15NC)[<= ] Limit flag on N(H15NC)meta.code.errorcharN(H15NC)? H^15^NC total column density (beam-averaged) (1)1e+11cm**-2phys.columnDensityfloatnullablee_N(H15NC)? rms uncertainty on N(H15NC)1e+11cm**-2stat.errorfloatnullablen_N(H15NC)[t] Note on N(H15NC) (G1)meta.notecharl_N(H13CN)[<= ] Limit flag on N(H13CN)meta.code.errorcharN(H13CN)? H^13^CN total column density (beam-averaged) (1)1e+12cm**-2phys.columnDensityfloatnullablee_N(H13CN)? rms uncertainty on N(H13CN)1e+12cm**-2stat.errorfloatnullablel_N(HC15N)[<= ] Limit flag on N(HC15N)meta.code.errorcharN(HC15N)? HC^15^N total column density (beam-averaged) (1)1e+11cm**-2phys.columnDensityfloatnullableHNC/HC13N? HNC/HC^13^N ratiophot.flux;arith.ratiointnullablee_HNC/HC13N? rms uncertainty on HNC/HC13Nstat.errorintnullable12C/13C^12^C/^13^C ratiophot.flux;arith.ratiointJ/MNRAS/478/3693/tablea1Values obtained with the fitting procedure described in Section 3 to the HN^13^C linesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSourceSource namemeta.id;meta.maincharvLSR? HN13C(1-0) LSR centroid velocitykm/sphys.veloc;pos.lsrfloatnullablee_vLSR? rms uncertainty on vLSRkm/sstat.error;phys.veloc;pos.lsrfloatnullableDv1/2? HN13C(1-0) FWHMkm/sspect.line.widthfloatnullablee_Dv1/2? rms uncertainty on Dv1/2km/sstat.errorfloatnullablel_Ntot[<= ] Limit flag on Ntotmeta.code.errorcharNtot? Total column density1e+12cm**-2phys.columnDensityfloatnullablee_Ntot? rms uncertainty on Ntot1e+12cm**-2stat.errorfloatnullabletau? Opacity of the linephys.absorption.coefffloatnullablee_tau? rms uncertainty on taustat.errorfloatnullablesigmarms of observed linemKstat.stdev;instr.det.noise;spect.lineintJ/MNRAS/478/3693/tablea2Values obtained with the fitting procedure described in Section 3 to the H^15^NC(1-0) linesSourceSource namemeta.id;meta.maincharvLSR? H15NC(1-0) LSR centroid velocitykm/sphys.veloc;pos.lsrfloatnullablee_vLSR? rms uncertainty on vLSRkm/sstat.error;phys.veloc;pos.lsrfloatnullablel_Dv1/2[<= ] Limit flag on Dv1/2meta.code.errorcharDv1/2? H^15^NC(1-0) FWHMkm/sspect.line.widthfloatnullablee_Dv1/2? rms uncertainty on Dv1/2km/sstat.errorfloatnullablel_Ntot[<= ] Limit flag on Ntotmeta.code.errorcharNtot? Total column density1e+12cm**-2phys.columnDensityfloatnullablee_Ntot? rms uncertainty on Ntot1e+12cm**-2stat.errorfloatnullablen_Ntot[t] Note on Ntot (G1)meta.notechartau? Opacity of the linephys.absorption.coefffloatnullablee_tau? rms uncertainty on taustat.errorfloatnullablesigmarms of observed linemKstat.stdev;instr.det.noise;spect.lineintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintJ/MNRAS/478/3693/tablea3*Values obtained with the fitting procedure described in Section 3 to the H^13^CN linese_Dv1/2? rms uncertainty on Dv1/2km/sstat.errorfloatnullablel_Ntot[<= ] Limit flag on Ntotmeta.code.errorcharNtot? Total column density1e+12cm**-2phys.columnDensityfloatnullablee_Ntot? rms uncertainty on Ntot1e+12cm**-2stat.errorfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSourceSource namemeta.id;meta.maincharvLSR? H^15^NC(1-0) LSR centroid velocitykm/sphys.veloc;pos.lsrfloatnullablee_vLSR? rms uncertainty on vLSRkm/sstat.error;phys.veloc;pos.lsrfloatnullabletau? Opacity of the linephys.absorption.coefffloatnullablee_tau? rms uncertainty on taustat.errorfloatnullablesigmarms of observed linemKstat.stdev;instr.det.noise;spect.lineintDv1/2? H^15^NC(1-0) FWHMkm/sspect.line.widthfloatnullableJ/MNRAS/478/3693/tablea4Values obtained with the fitting procedure described in Section 3 to the HC^15^N(1-0) linestau? Opacity of the linephys.absorption.coefffloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSourceSource namemeta.id;meta.maincharvLSR? HC^15^N(1-0) LSR centroid velocitykm/sphys.veloc;pos.lsrfloatnullablee_vLSR? rms uncertainty on vLSRkm/sstat.error;phys.veloc;pos.lsrfloatnullableDv1/2? HC^15^N(1-0) FWHMkm/sspect.line.widthfloatnullablee_Dv1/2? rms uncertainty on Dv1/2km/sstat.errorfloatnullablel_Ntot[<= ] Limit lfag on Ntotmeta.code.errorcharNtot? Total column density1e+12cm**-2phys.columnDensityfloatnullablee_Ntot? rms uncertainty on Ntot1e+12cm**-2stat.errorfloatnullablen_Ntot[t] Note on Ntot (G1)meta.notechare_tau? rms uncertainty on taustat.errorfloatnullablesigmarms of observed linemKstat.stdev;instr.det.noise;spect.lineint