J/MNRAS/446/3842ivo://CDS.VizieR/J/MNRAS/446/3842doi:10.26093/cds/vizier.74463842CDSArmijos-Abendano J.Martin-Pintado J.Requena-Torres M.A.Martin S.,Rodriguez-Franco A.2024-08-14T20:19:14Z2017-11-16T08:10:39ZCDS support team

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

cds-question@unistra.frmilky-way-galaxyinterstellar-mediummolecular-cloudsspectroscopyWe present the results of two Mopra 3-mm spectral line surveys of the lines of sight (LOS) towards the Galactic Centre (GC) molecular complexes Sgr B2 (LOS+0.693) and Sgr A (LOS-0.11). The spectra covered the frequency ranges of ~77-93 GHz and ~105-113 GHz. We have detected 38 molecular species and 25 isotopologues. The isotopic ratios derived from column density ratios are consistent with the canonical values, indicating that chemical isotopic fractionation and/or selective photodissociation can be considered negligible (<10 percent) for the GC physical conditions. The derived abundances and rotational temperatures are very similar for both LOSs, indicating very similar chemical and excitation conditions for the molecular gas in the GC. The excitation conditions are also very similar to those found for the nucleus of the starburst galaxy NGC 253. We report for the first time the detection of HCO and HOC^+^ emission in LOS+0.693. Our comparison of the abundance ratios between CS, HCO, HOC^+^ and HCO^+^ found in the two LOSs with those in typical Galactic photodissociation regions (PDRs) and starbursts galaxies does not show any clear trend to distinguish between ultraviolet- and X-ray-induced chemistries. We propose that the CS/HOC^+^ ratio could be used as a tracer of the PDR components in the molecular clouds in the nuclei of galaxies.2015MNRAS.446.3842Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/446/3842CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/ApJS/117/427 : Sgr B2 spectral survey (Nummelin+, 1998)J/ApJS/196/12 : First results from Mopra HCO^+^ maps (Barnes+, 2011)J/A+A/595/A94 : Temperature structures in Galactic center cloudshttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/446/3842https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/446/3842http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/446/3842https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/446/3842https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/446/3842http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/446/3842GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/MNRAS/446/3842/table1Line parameters for the LOS+0.693recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMolMoleculemeta.noten_Mol[bc] Note on molecule (1)meta.notecharFreqFrequencyMHzem.freqdoubleTransTransitionmeta.id;phys.atmol.transitioncharArea? AreaK.km/sphot.fluxfloatnullablee_Area? Uncertainty in AreaK.km/sstat.error;phys.areafloatnullableb_VLSR? Local Standard of Rest velocity interval, lower valuekm/sphys.veloc;pos.lsrfloatnullableB_VLSR? Local Standard of Rest velocity interval, upper valuekm/sphys.veloc;pos.lsrfloatnullableVLSR? Local Standard of Rest velocitykm/sphys.veloc;pos.lsrfloatnullablee_VLSR? Uncertainty in VLSRkm/sstat.error;phys.veloc;pos.lsrfloatnullablen_VLSR[a] Note on VLSR (2)meta.notecharDeltav1/2? Average value of the FWHM of the line, {Delta}v_1/2_km/sspect.line.widthfloatnullablee_Deltav1/2? Uncertainty in Deltav1/2km/sstat.errorfloatnullablen_Deltav1/2[a] Note on Deltav1/2 (2)meta.notecharTa*? Ambient temperaturemKphys.temperaturefloatnullablee_Ta*? Uncertainty in Ta*mKstat.errorfloatnullablen_Ta*[a] Note on Ta*meta.notecharNoteNote(s) (3)meta.notecharJ/MNRAS/446/3842/table2Line parameters for the LOS-0.11recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMolMoleculemeta.noten_Mol[bc] Note on molecule (1)meta.notecharFreqFrequencyMHzem.freqdoubleTransTransitionmeta.id;phys.atmol.transitioncharArea? AreaK.km/sphot.fluxfloatnullablee_Area? Uncertainty in AreaK.km/sstat.error;phys.areafloatnullableb_VLSR? Local Standard of Rest velocity interval, lower valuekm/sphys.veloc;pos.lsrfloatnullableB_VLSR? Local Standard of Rest velocity interval, upper valuekm/sphys.veloc;pos.lsrfloatnullableVLSR? Local Standard of Rest velocitykm/sphys.veloc;pos.lsrfloatnullablee_VLSR? Uncertainty in VLSRkm/sstat.error;phys.veloc;pos.lsrfloatnullablen_VLSR[a] Note on VLSR (2)meta.notecharDeltav1/2? Average value of the FWHM of the line, {Delta}v_1/2_km/sspect.line.widthfloatnullablee_Deltav1/2? Uncertainty in Deltav1/2km/sstat.errorfloatnullablen_Deltav1/2[a] Note on Deltav1/2 (2)meta.notecharTa*? Ambient temperaturemKphys.temperaturefloatnullablee_Ta*? Uncertainty in Ta*mKstat.errorfloatnullablen_Ta*[a] Note on Ta*meta.notecharNoteNote(s) (3)meta.notecharJ/MNRAS/446/3842/table3T_rot_, column densities and abundances for both LOSsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintLOS[AB] Line of sight identification (1)meta.id;spect.linecharMolMoleculemeta.noten_Mol[e] Note on Mol (2)meta.notecharb_VLSR? Local Standard of Rest velocity interval, lower valuekm/sphys.veloc;pos.lsrintnullableB_VLSR? Local Standard of Rest velocity interval, upper valuekm/sphys.veloc;pos.lsrintnullablen_B_VLSR[g] Note on B_VLSR (3)meta.notecharl_VLSR[~] Limit flag on VLSRmeta.code.error;phys.veloc;pos.lsrcharVLSR? Local Standard of Rest velocitykm/sphys.veloc;pos.lsrfloatnullablee_VLSR? Uncertainty in VLSRkm/sstat.error;phys.veloc;pos.lsrfloatnullablen_VLSR[cf] Note on VLSR (4)meta.notecharTrot? Rotational temperature (5)Kphys.temperaturefloatnullablee_Trot? Uncertainty in TrotKstat.errorfloatnullablen_Trot[c] Note on Trot (4)meta.notecharl_N[>~ ] Limit flag on Nmeta.code.errorcharN? Local thermodynamic equilibrium total molecular column density1e+13cm**-2phys.columnDensitydoublenullablee_N? Uncertainty in N1e+13cm**-2stat.errorfloatnullablen_N[bcd] Note on N (4)meta.notecharb_N/NH2? N/NH_2_ column density ratio interval, lower valuephys.density;arith.ratiofloatnullableB_N/NH2? N/NH_2_ column density ratio interval, upper valuephys.density;arith.ratiofloatnullablen_B_N/NH2[g] Note on B_N/NH2 (3)meta.notecharl_N/NH2[>~ ] Limit flag on N/NH2meta.code.errorcharN/NH2? N/NH_2_ column density ratiophys.density;arith.ratiofloatnullablee_N/NH2? Uncertainty in N/NH2stat.errorfloatnullable