J/ApJ/790/84ivo://CDS.VizieR/J/ApJ/790/84doi:10.26093/cds/vizier.17900084CDSLu X.Zhang Q.Liu H.B.Wang J.Gu Q.2018-01-03T05:18:13Z2017-03-27T12:14:07ZCDS support team

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

cds-question@unistra.frmolecular-cloudsinterstellar-mediumyoung-stellar-objectsWe report systematic mapping observations of the NH_3_(1, 1) and (2, 2) inversion lines toward 62 high-mass star-forming regions using the Very Large Array (VLA) in its D and DnC array configurations. The VLA images cover a spatial dynamic range from 40'' to 3'', allowing us to trace gas kinematics from ~1 pc scales to <~ 0.1 pc scales. Based on the NH_3_ morphology and the infrared nebulosity on 1 pc scales, we categorize three subclasses in the sample: filaments, hot cores, and NH_3_-dispersed sources. The ubiquitous gas filaments found on 1 pc scales have a typical width of ~0.1 pc and often contain regularly spaced fragments along the major axis. The spacing of the fragments and the column densities is consistent with the turbulent supported fragmentation of cylinders. Several sources show multiple filaments that converge toward a center where the velocity field in the filaments is consistent with gas flows. We derive rotational temperature maps for the entire sample. For the three hot core sources, we find a projected radial temperature distribution that is best fit by power-law indices from -0.18 to -0.35. We identify 174 velocity-coherent ~0.1 pc scale dense cores from the entire sample. The mean physical properties for these cores are 1.1 km/s in intrinsic linewidth, 18 K in NH_3_ rotational temperature, 2.3x10^15^/cm2 in NH_3_gas column density, and 67 M_{sun}_in molecular mass. The dense cores identified from the filamentary sources are closer to being virialized. Dense cores in the other two categories of sources appear to be dynamically unstable.2014ApJ...790...84Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/790/84CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/308/573 : Ammonia on YSOs IRAS sources (Molinari+ 1996)J/A+AS/124/385 : Dense molecular cores. V. (Zinchenko+ 1997)J/ApJS/125/161 : A database of dense cores mapped in ammonia (Jijina+, 1999)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/790/84https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/790/84http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/790/84https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/790/84https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/790/84http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/790/84GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/790/84/table6 (Dense core properties)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/790/84/table6?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/790/84/table6?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/790/84/table6?GETtext/xml+votable180.050000true84.80112535.76607780.005555555555555556Cone search capability for table J/ApJ/790/84/table2 (Observational Properties of the Sources)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/790/84/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/790/84/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/790/84/table2?GETtext/xml+votable180.050000true84.802535.76452780.0055555555555555566/13050 14307 14309 14333 14352 14409 14614 14642 14692 14693 22212 23637 23773 23795 24325 24378 24554 29090 29100 29101 29103 29113 29118 29461 29504 29505 29509 29510 29513 29529 29532 29533 30218 30219 30244 30258 30260 30262 30267 30268 30312 30313 30316 30318 30319 30405 30419 30420 30425 30594 30595 30604 30605 30616 30695 30714 30716https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/790/84?format=asciidefaultJ/ApJ/790/84/table6Dense core propertiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDCore identifiermeta.id;meta.maincharRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainRIntrinsic core radiuspcphys.size.radiusfloatDelVIntrinsic line widthkm/sspect.line.widthfloatTR? Rotational temperatureKphys.temperaturefloatnullableNNH3NH_3_ column densitycm**-2phys.columnDensityfloatMcoreCore masssolMassphys.massfloatRatio? Ratio of virial to core massesphys.mass;arith.ratiofloatnullableMulti[yes ] Multi-Velocity flagmeta.codecharSimbadSimbad column added by the CDSmeta.ref.urlcharJ/ApJ/790/84/table1Summary of the VLA ObservationsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIndex[1/6] Project indexmeta.idintProjectProject namemeta.id;obscharDateProject datetime.epochnullableConfig[C,D,DnC ] VLA array configurationphys.atmol.configuration;instr.setupcharDistThe uv-distance interval of the observation (in klambda units)em.wlcharNum[1/42] Number of samplesmeta.numberintPhaseCPhase calibrator(s) usedsrc.orbitalcharrmsrms level (per channel)mJy/beamstat.stdev;instr.det.noise;phys.atmol.levelfloatJ/ApJ/790/84/table2Observational Properties of the SourcesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSourceSource namemeta.id;meta.maincharIndex[1/6] Project index defined in table 1meta.idintRAJ2000Hour of Right Ascension (J2000) (1)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000) (1)pos.eq.dec;meta.mainGLONGalactic longitude (1)degpos.galactic.lonGLATGalactic latitude (1)degpos.galactic.latfloatNH3NH_3_ line(s) detectionmeta.id;spect.linecharVLSR? Local Standard of Rest velocitykm/sphys.veloc;pos.lsrfloatnullableDist? Distancekpcpos.distancefloatnullablen_DistNote on Dist (2)meta.notecharLIR? IRAS point source luminositysolLumphys.luminosity;em.IRdoublenullableNcore[0/15]? Number of core for this source in table6meta.numberintnullableSimbadSimbad column added by the CDSmeta.ref.urlchar