J/ApJ/832/187ivo://CDS.VizieR/J/ApJ/832/187doi:10.26093/cds/vizier.18320187CDSBrogan C.L.Hunter T.R.Cyganowski C.J.Chandler C.J.Friesen R.,Indebetouw R.2018-10-22T08:00:08Z2018-10-03T07:51:05ZCDS support team

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

cds-question@unistra.frinterstellar-mediumastrophysical-masersradio-astronomyradio-continuum-emissionmillimeter-astronomysubmillimeter-astronomyWe present Very Large Array and Atacama Large Millimeter/submillimeter Array imaging of the deeply embedded protostellar cluster NGC 6334I from 5cm to 1.3mm at angular resolutions as fine as 0.17" (220au). The dominant hot core MM1 is resolved into seven components at 1.3mm, clustered within a radius of 1000au. Four of the components have brightness temperatures >200K, radii ~300au, minimum luminosities ~10^4^L_{sun}_, and must be centrally heated. We term this new phenomenon a "hot multi-core." Two of these objects also exhibit compact free-free emission at longer wavelengths, consistent with a hypercompact HII region (MM1B) and a jet (MM1D). The spatial kinematics of the water maser emission centered on MM1D are consistent with it being the origin of the high-velocity bipolar molecular outflow seen in CO. The close proximity of MM1B and MM1D (440au) suggests a proto-binary or a transient bound system. Several components of MM1 exhibit steep millimeter spectral energy distributions indicative of either unusual dust spectral properties or time variability. In addition to resolving MM1 and the other hot core (MM2) into multiple components, we detect five new millimeter and two new centimeter sources. Water masers are detected for the first time toward MM4A, confirming its membership in the protocluster. With a 1.3mm brightness temperature of 97K coupled with a lack of thermal molecular line emission, MM4A appears to be a highly optically thick 240L_{sun}_ dust core, possibly tracing a transient stage of massive protostellar evolution. The nature of the strongest water maser source CM2 remains unclear due to its combination of non-thermal radio continuum and lack of dust emission.2016ApJ...832..187Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/832/187CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/291/943 : Protostellar cores (Ossenkopf+, 1994)J/A+A/316/102 : JHK Photometry in NGC 6334 (Tapia+, 1996)J/A+AS/137/43 : OH/H2O masers database (Forster+, 1999)J/A+A/440/121 : K magnitudes of OB stars in UCHIIs (Bik+, 2005)J/AJ/131/1872 : Fourth VLBA calibrator survey: VCS4 (Petrov+, 2006)J/A+A/466/989 : Hot ammonia from NGC6334I & NGC6334I(N) (Beuther+, 2007)J/A+A/481/169 : ATCA 3mm obs. of NGC6334I & NGC6334I(N) (Beuther+, 2008)J/A+A/490/213 : 1.4 and 3.4mm interferometry of W3 IRS5 (Rodon+, 2008)J/ApJ/707/1 : Water and Methanol masers in NGC 6334I(N) (Brogan+, 2009)J/other/PASA/26.454 : Precise positions of methanol masers (Caswell, 2009)J/AJ/138/227 : Stellar clusters in NGC 6334 complex (Feigelson+, 2009)J/ApJ/715/310 : Early stages of star formation in IRDC (Rathborne+, 2010)J/A+A/515/A55 : NGC 6334-NGC 6357 complex (Russeil+, 2010)J/A+A/538/A142 : OB stars in NGC 6334 and NGC 6357 (Russeil+, 2012)J/ApJ/778/96 : Spitzer & NEWFIRM obs. of NGC 6334 (Willis+, 2013)J/ApJ/783/130 : Plx of high mass star forming regions (Reid+, 2014)J/ApJS/213/1 : The MSFRs Omnibus X-ray Catalog (MOXC) (Townsley+, 2014)J/A+A/577/A30 : SDC335.579-0.292 6, 8, 23 & 25GHz images (Avison+, 2015)J/A+A/588/A30 : Properties of cores in OMC 2/3 (Sadavoy+, 2016)J/ApJ/851/L46 : CH_3_OCH_2_OH ALMA detection in NGC6334I (McGuire+, 2017)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/832/187https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/832/187http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/832/187https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/832/187https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/832/187http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/832/187GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/832/187/table2 (Fitted properties of the continuum emission)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/832/187/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/832/187/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/832/187/table2?GETtext/xml+votable180.050000true260.2225625-35.782744440.005555555555555556Cone search capability for table J/ApJ/832/187/table3 (Fitted H_2_O maser properties)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/832/187/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/832/187/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/832/187/table3?GETtext/xml+votable180.050000true260.22125-35.784258330.0055555555555555566/424563.972891348526667e-24 1.528037907652962e-22https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/832/187?format=asciiRadioMillimeterdefaultJ/ApJ/832/187/table2Fitted properties of the continuum emissionPA[5/180]? Position angle (8)degpos.posAngintnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameContinuum source designationmeta.id;meta.maincharprimarym_NameComponent designation within Namemeta.code.multipcharf_Name[eg] Flag on Name (1)meta.codecharBandFitting band (1.3mm, 7mm or 5cm) (2)instr.bandpasscharRAJ2000[17] Hour of right ascension (J2000) (3)pos.eq.ra;meta.mainDEJ2000[35] Degree of declination (J2000) (3)pos.eq.dec;meta.mainl_S5cmLimit flag on S5cm (4)meta.code.errorcharS5cm[0.06/5] VLA 5cm flux density (5)mJyphot.flux.density;em.radio.6-12GHzfloate_S5cm[0.02/0.2]? Formal fitting S5cm uncertainty for detected sourcemJystat.errorfloatnullablel_S1.5cmLimit flag on S1.5cm (4)meta.code.errorcharS1.5cm[0.1/2] VLA 1.5cm flux densitymJyphot.flux.density;em.radio.12-30GHzfloate_S1.5cm[0.06/0.2]? S1.5cm uncertainty for detected sourcemJystat.errorfloatnullablel_S7mmLimit flag on S7mm (4)meta.code.errorcharS7mm[0.1/5.6] VLA 7mm flux densitymJyphot.flux.density;em.mm.30-50GHzfloate_S7mm[0.05/0.2]? Formal fitting S7mm uncertainty for detected sourcemJystat.errorfloatnullablel_S3mmLimit flag on S3mm (4)meta.code.errorcharS3mm[1/840]? ALMA 3mm flux density (5)mJyphot.flux.density;em.mm.50-100GHzfloatnullablee_S3mm[0.1/14]? Formal fitting S3mm uncertainty for detected sourcemJystat.errorfloatnullablef_S3mm[c] c="confused" (angular resolution insufficient to make an estimate)meta.codecharl_S1.3mmLimit flag on S1.3mm (4)meta.code.errorcharS1.3mm[6/10975] ALMA 1.3mm flux density (5)mJyphot.flux.density;em.mm.200-400GHzfloate_S1.3mm[1/140]? Formal fitting S1.3mm uncertainty for detected sourcemJystat.errorintnullablel_Size1Limit flag on Size (6)meta.code.error;pos.distance;phys.sizecharSize1[0.1/1.1]? Size on axis 1arcsecphys.angSizefloatnullablel_Size2Limit flag on Size2 (6)meta.code.error;pos.distance;phys.sizecharSize2[0.1/0.6]? Size on axis 2arcsecphys.angSizefloatnullablef_Size[f] Flag on Size (1)meta.codechare_Size[0.02/0.1]? Size uncertainty (7)arcsecstat.error;phys.angSizefloatnullableJ/ApJ/832/187/table3Fitted H_2_O maser propertiesFlux[0.2/493] Flux density (1)Jyphot.flux.density;em.radio.12-30GHzfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintAssocName of the continuum source associated with this masermeta.id;spect.continuumcharSeq[1/47] Spot number (by increasing declination)meta.id;meta.mainintRAJ2000[17] Hour of right ascension (J2000) (1)pos.eq.ra;meta.mainDEJ2000[35] Degree of declination (J2000) (1)pos.eq.dec;meta.maine_Flux[0.02/3.7] Flux uncertaintyJystat.error;phot.fluxfloatVelPk[-38.5/13.5] Velocity peakkm/sphys.veloc;stat.maxfloatVelMin[-42/13] Minimum velocitykm/sphys.veloc;stat.minfloatVelMax[-37.5/13.5] Maximum velocitykm/sphys.veloc;stat.maxfloat