J/ApJ/883/129ivo://CDS.VizieR/J/ApJ/883/129doi:10.26093/cds/vizier.18830129CDSEl-Abd S.J.Brogan C.L.Hunter T.R.Willis E.R.Garrod R.T.,McGuire B.A.2021-07-05T08:55:49Z2021-03-31T12:03:23ZCDS support team

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

cds-question@unistra.fratomic-physicsmolecular-physicsradio-astronomystar-forming-regionsinterstellar-mediumThe relative column densities of the structural isomers methyl formate, glycolaldehyde, and acetic acid are derived for a dozen positions toward the massive star-forming regions MM1 and MM2 in the NGC 6334I complex, which are separated by ~4000au. Relative column densities of these molecules are also gathered from the literature for 13 other star-forming regions. In this combined data set, a clear bimodal distribution is observed in the relative column densities of glycolaldehyde and methyl formate. No such distribution is evident with acetic acid. The two trends are comprised of star-forming regions with a variety of masses, suggesting that there must be some other common parameter that is heavily impacting the formation of glycolaldehyde. This is indicative of some demonstrable differentiation in these cores; studying the abundances of these isomers may provide a clue as to the integral chemical processes ongoing in a variety of protostellar environments.2019ApJ...883..129Ehttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/883/129CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/466/989 : Hot ammonia from NGC 6334I and NGC 6334I(N) (Beuther+, 2007)J/ApJ/723/845 : The submillimeter spectrum of glycolaldehyde (Carroll+, 2010)J/A+A/532/A32 : HCOOCH3 map of Orion-KL (Favre+, 2011)J/A+A/559/A47 : Sgr B2(N) and Sgr B2(M) IRAM 30m line survey (Belloche+, 2013)J/A+A/568/A65 : NGC 7129 FIRS 2 interferometric 1-D spectrum (Fuente+, 2014)J/A+A/582/A64 : W51/e2 and G34.3+0.2 IRAM spectra (Lykke+, 2015)J/ApJ/851/L46 : CH_3_OCH_2_OH ALMA detection in NGC 6334I (McGuire+, 2017)J/A+A/598/A59 : G31.41+0.31 SMA spectra (Rivilla+, 2017)J/ApJ/866/87 : VLA 22GHz water masers obs. in NGC6334I-MM1 (Brogan+, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/883/129https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/883/129http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/883/129https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/883/129https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/883/129http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/883/129GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/883/129/table2 (Physical parameters for spectra extraction locations in NGC 6334I)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/883/129/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/883/129/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/883/129/table2?GETtext/xml+votable180.050000true260.2223875-35.78287250.005555555555555556Cone search capability for table J/ApJ/883/129/table3 (C_2_H_4_O_2_ isomer column densities in each source)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/883/129/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/883/129/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/883/129/table3?GETtext/xml+votable180.050000true260.222292-35.783750.0055555555555555566/862 15759 15965 21439 28830 30218 30259 30269 30318 30694 42456 42970https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/883/129?format=asciiRadiodefaultJ/ApJ/883/129/table2Physical parameters for spectra extraction locations in NGC 6334IrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRegMM1 and MM2 region identifiermeta.id;meta.maincharprimaryRAJ2000[17] Hour of right ascension (J2000)pos.eq.ra;meta.mainDEJ2000[35] Degree of declination (J2000)pos.eq.dec;meta.mainTex[135/285] Excitation temperatureKphys.atmol.excitationintTbgLo[21.8/159.3] Background temperature for the lower sideband of the ALMA dataKinstr.backgroundfloatTbgUp[27.8/192.7] Background temperature for the upper sideband of the ALMA dataKinstr.backgroundfloatVLSR[-9/-4.4] Local Standard of Rest velocitykm/sphys.veloc;pos.lsrfloatDelV[2.5/4.5] Linewidth {Delta}Vkm/sobs.paramfloatJ/ApJ/883/129/table1Transitions used to calculate isomer column densities in NGC 6334IKa1The Ka" levelphys.mol.qncharA/ESymmetryphys.atmol.paritycharMolMolecule identifiermeta.idcharJ1[12/33] The J" levelmeta.noteintKc1The Kc" levelphys.mol.qncharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRegMM1 and MM2 region identifiermeta.id;meta.maincharprimaryJ0[13/34] The J' levelmeta.noteintKa0The Ka' levelphys.mol.qncharKc0The Kc' levelphys.mol.qncharFreq[279230/351209.4] FrequencyMHzem.freqdoubleEup[70.47/442.07] Upper state energyKphys.energy;phys.atmol.levelfloatSijmu2[2/320.1] Intrinsic line strength time the squared dipole momentD**2spect.line.intensitydoubleIobs[0.02/0.43] Observed intensityJy/beamspect.line.intensityfloatJ/ApJ/883/129/table3C_2_H_4_O_2_ isomer column densities in each sourceSimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSourceSource namemeta.id;meta.maincharRegMM1 and MM2 region identifierobs.fieldcharprimaryNMF[5.4e+13/7e+18] Methyl formate column densityphys.columnDensitydoublee_NMF[8e+12/3e+18] NMF uncertaintystat.errordoublel_NGALimit flag on NGAmeta.code.errorcharNGA[3.4e+13/3e+17] Glycolaldehyde column densityphys.columnDensitydoublee_NGA[7e+12/2e+17]? NGA uncertaintystat.errordoublenullablel_NAALimit flag on NAAmeta.code.errorcharNAA[2.1e+13/7e+17]? Acetic acid column densityphys.columnDensitydoublenullablee_NAA[7e+14/1e+17]? NAA uncertaintystat.errordoublenullablel_MF/GA[>= ] Limit flag on MF/GAmeta.code.errorcharMF/GA[1.6/667]? Methyl formate to glycolaldehyde (MF/GA) ratiostat.fit.omcfloatnullablee_MF/GA[0.4/85]? MF/GA uncertaintystat.errorfloatnullableClassMF/GA classification (see Section 4)src.classcharMassRegion mass (1)src.classcharObsObservation type (Int.=Interferometer; S.D.=Single-dish)meta.notecharBeamBeam corrected (2)meta.codecharf_Beam[a] Flag on Beam (3)meta.codecharRefReference(s) (4)meta.ref;pos.framechar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.main