J/A+A/606/A133ivo://CDS.VizieR/J/A+A/606/A133doi:10.26093/cds/vizier.36060133CDSSokolov V.Wang K.Pineda J.E.Caselli P.Henshaw J.D.Tan J.C.,Fontani F.Jimenez-Serra I.Lim W.2017-11-03T16:24:49Z2017-11-03T17:24:15ZCDS support team

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

cds-question@unistra.frmolecular-cloudsinfrared-sourcesInfrared dark clouds represent the earliest stages of high-mass star formation. Detailed observations of their physical conditions on all physical scales are required to improve our understanding of their role in fueling star formation. We investigate the large-scale structure of the IRDC G035.39-00.33, probing the dense gas with the classical ammonia thermometer. This allows us to put reliable constraints on the temperature of the extended, pc-scale dense gas reservoir and to probe the magnitude of its non-thermal motions. Available far-infrared observations can be used in tandem with the observed ammonia emission to estimate the total gas mass contained in G035.39-00.33. We identify a main velocity component as a prominent filament, manifested as an ammonia emission intensity ridge spanning more than 6 pc, consistent with the previous studies on the Northern part of the cloud. A number of additional line-of-sight components are found, and a large-scale linear velocity gradient of ~0.2km/s/pc is found along the ridge of the IRDC. In contrast to the dust temperature map, an ammonia-derived kinetic temperature map, presented for the entirety of the cloud, reveals local temperature enhancements towards the massive protostellar cores. We show that without properly accounting for the line of sight contamination, the dust temperature is 2-3K larger than the gas temperature measured with NH_3_. While both the large-scale kinematics and temperature structure are consistent with that of starless dark filaments, the kinetic gas temperature profile on smaller scales is suggestive of tracing the heating mechanism coincident with the locations of massive protostellar cores.2017A&A...606A.133Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/606/A133CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/651/L125 : Water masers associated with IR dark cloud cores (Wang+, 2006)J/ApJ/639/227 : MSX IRDC candidate catalog (Simon+, 2006)J/ApJ/641/389 : Millimetric observations of IRDC cores (Rathborne+, 2006)J/ApJ/686/384 : ^12^CO, ^13^CO, C^18^O survey of IRDCs (Du+, 2008)J/ApJ/715/310 : Early stages of star formation in IRDCs (Rathborne+, 2010)J/ApJ/756/60 : A 3mm line survey in 37 IR dark clouds (Sanhueza+, 2012)J/A+A/598/A76 : Six infrared dark clouds multi-wavelength obs. (Zhang+, 2017)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/606/A133https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/606/A133http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/606/A133https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/606/A133https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/606/A133http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/606/A133GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/606/A133/list (List of datacubes)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/606/A133/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/606/A133/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/606/A133/list?GETtext/xml+votable180.050000true284.283392.150.0055555555555555566/30319https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/606/A133?format=asciiInfrareddefaultJ/A+A/606/A133/listList of datacubesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right Ascension of center (J2000)degpos.eq.ra;meta.mainDEJ2000Declination of center (J2000)degpos.eq.dec;meta.mainNxNumber of pixels along X-axismeta.numberintNyNumber of pixels along Y-axismeta.numberintNzNumber of slicesmeta.numberintbVradLower value of velocity intervalkm/sphys.veloc;pos.heliocentricfloatBVradUpper value of velocity intervalkm/sphys.veloc;pos.heliocentricfloatdVradVelocity resolutionkm/sspect.resolutiondoublesizeSize of FITS fileKibytephys.size;meta.fitsintFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fits