J/ApJ/916/69ivo://CDS.VizieR/J/ApJ/916/69doi:10.26093/cds/vizier.19160069CDSJames T.A.Viti S.Yusef-Zadeh F.Royster M.Wardle M.2023-02-08T06:47:33Z2023-01-26T08:47:38ZCDS support team

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

cds-question@unistra.frmillimeter-astronomysubmillimeter-astronomyinterstellar-mediumradial-velocityWe report subarcsecond Atacama Large Millimeter/submillimeter Array (ALMA) observations between 272 and 375GHz toward Sgr A*'s circumnuclear disk (CND). Our data comprise eight individual pointings, with significant SiO (8_7_-7_6_) and SO (7-6) emission detected toward 98 positions within these pointings. Additionally, we identify H2CS (9_1,9_-8_1,8_), OCS (25-24), and CH_3_OH (2_1,1_-2_0,2_) toward a smaller subset of positions. By using the observed peak line flux density, together with a Bayesian inference technique informed by radiative transfer models, we systematically recover the physical gas conditions toward each of these positions. We estimate that the bulk of the surveyed gas has temperature T_kin_<500K and density n_H_<~10^6^cm^-3^, consistent with previous studies of similar positions as traced by HCN clumps. However, we identify an uncharacteristically hot (T_kin_~600K) and dense (n_H_~10^6^cm^-3^) source in the Northeastern Arm. This position is found to be approximately consistent with a gravitationally bound region dominated by turbulence. We also identify a nearby cold (T_kin_~60K) and extremely dense (n_H_~10^7^cm^-3^) position that is again potentially bound and dominated by turbulence. We also determine that the total gas mass contained within the CND is M_CND_<~4x10^4^M_{sun}_. Furthermore, we qualitatively note that the observed chemical enrichment across large scales within the CND is consistent with bulk grain processing, though multiple desorption mechanisms are plausibly responsible. Further chemical modeling is required to identify the physical origin of the grain processing, as well as the localized H2CS and OCS emission.2021ApJ...916...69Jhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/916/69CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/643/1011 : Early-type stars in the center of the Galaxy (Paumard+, 2006)J/ApJ/764/L19 : Methanol emission from the Gal. Center (Yusef-Zadeh+, 2013)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/916/69https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/916/69http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/916/69https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/916/69https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/916/69http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/916/69GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/916/69/table3 (*Summary of observations)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/916/69/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/916/69/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/916/69/table3?GETtext/xml+votable180.050000true266.41925-29.00668060.0055555555555555566/28830https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/916/69?format=asciiMillimeterdefaultJ/ApJ/916/69/table3*Summary of observationsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDSource designationmeta.id;meta.maincharprimarym_ID[c1 ] Component number on IDmeta.code.multipcharRAJ2000Hour of right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of declination (J2000)pos.eq.dec;meta.mainExtent[1/89.4] Extent in beam sizesphys.size.radiusfloatLineEmission line detectedmeta.id;spect.linecharFlux[1.7/58.6] Peak Line flux densitymJy/beamphot.flux.density;em.mm.200-400GHzfloate_Flux[0.1/9] Flux uncertaintymJy/beamstat.error;phot.fluxfloatVlsr[-95.2/110] Local Standard of Rest velocitykm/sphys.veloc;pos.lsrdoubleDelV[-15/36.6] Line widthkm/sspect.line.widthfloatSiO/Si[0.2/13.5]? Ratio of SiO to SO flux densitiesphot.flux;arith.ratiofloatnullablee_SiO/Si[-0.01/9.7]? SiO/Si uncertaintystat.errorfloatnullableJ/ApJ/916/69/table4The points of highest posterior density of the physical conditions toward each observational sourcee_logNSO[0.04/0.4]? Lower uncertainty on logNSOlog(cm**-2)stat.errorfloatnullableIDSource designationmeta.id;meta.maincharprimaryrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintm_ID[c1/c2 ] Component number on IDmeta.code.multipcharTkin[63/917]? Gas temperatureKphys.temperatureintnullablee_Tkin[0/574]? Lower uncertainty on TkinKstat.errorintnullableE_Tkin[22/509]? Upper uncertainty on TkinKstat.error;stat.maxintnullablelognH[5.43/7]? Log of hydrogen density numberlog(cm**-3)meta.number;phys.densityfloatnullablee_lognH[0.14/2]? Lower uncertainty on lognHlog(cm**-3)stat.errorfloatnullableE_lognH[0/1.33]? Upper uncertainty on lognHlog(cm**-3)stat.error;stat.maxfloatnullablelogNSiO[12.8/14.3] Log of SiO column densitylog(cm**-2)phys.columnDensityfloate_logNSiO[0.05/1.01] Lower uncertainty on logNSiOlog(cm**-2)stat.errorfloatE_logNSiO[0.058/0.9] Upper uncertainty on logNSiOlog(cm**-2)stat.error;stat.maxfloatlogNSO[14/15.11]? Log of SO column densitylog(cm**-2)phys.columnDensityfloatnullableE_logNSO[0.05/0.7]? Upper uncertainty on logNSOlog(cm**-2)stat.error;stat.maxfloatnullableFig? Figure set number (in Figure 9); column added by CDSmeta.bib.figintnullable