J/A+A/692/A114ivo://CDS.VizieR/J/A+A/692/A114doi:10.26093/cds/vizier.36920114CDSNeupane S.Wyrowski F.Menten K.M.Urquhart J.Colombo D.Lin L.-H.,Garay G.2025-02-27T20:02:19Z2024-12-06T12:00:13ZCDS support team

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

cds-question@unistra.frmolecular-cloudsco-line-emissionradio-astronomyNGC 6334 is a giant molecular cloud (GMC) complex that exhibits elongated filamentary structure and harbours numerous OB-stars, HII regions, and star-forming clumps. To study the emission morphology and velocity structure of the gas in the extended NGC 6334 region using high-resolution molecular line data, we made observations of the ^12^CO and ^13^CO J=3 --> 2 lines with the LAsMA instrument at the APEX telescope . The LAsMA data provided a spatial resolution of 20" (~0.16pc) and sensitivity of ~0.4K at a spectral resolution of 0.25km/s. Our observations revealed that gas in the extended NGC 6334 region exhibits connected velocity coherent structure over ~80pc parallel to the Galactic plane. The NGC 6334 complex has its main velocity component at ~-3.9km/s with two connected velocity structures at velocities ~-9.2km/s (the `bridge' features) and ~-20km/s (the northern filament, NGC 6334-NF). We observed local velocity fluctuations at smaller spatial scales along the filament that are likely tracing local density enhancement and infall, while the broader V-shaped velocity fluctuations observed towards the NGC 6334 central ridge and G352.1 region located in the eastern filament EF1 indicate globally collapsing gas onto the filament. We investigated the ^13^CO emission and velocity structure around 42 WISE HII regions located in the extended NGC 6334 region and found that most HII regions show signs of molecular gas dispersal from the centre (36 of 42) and intensity enhancement at their outer radii (34 of 42). Furthermore most HII regions (26 of 42) are associated with least one ATLASGAL clump within or just outside of their radii, the formation of which may have been triggered by HII bubble expansion. Typically towards larger HII regions we found visually clear signatures of bubble shells emanating from the filamentary structure. Overall the NGC 6334 filamentary complex exhibits sequential star formation from west to east. Located in the west, the GM-24 region exhibits bubbles within bubbles and is at a relatively evolved stage of star formation. The NGC 6334 central ridge is undergoing global gas infall and exhibits two gas bridge features possibly connected to the cloud-cloud collision scenario of the NGC 6334-NF and the NGC 6334 main gas component. The relatively quiescent eastern filament (EF1 - G352.1) is a hub-filament in formation, which shows the kinematic signature of global gas infall onto the filament. Our observations highlight the important role of HII regions in shaping the molecular gas emission and velocity structure as well as the overall evolution of the molecular filaments in the NGC 6334 complex.2024A&A...692A.114Nhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/692/A114CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/587/A135 : Halpha images of NGC 6334 and NGC 6357 (Russeil+, 2016)J/A+A/592/A54 : Combined ArTeMiS+SPIRE 350um image of NGC6334 (Andre+, 2016)J/A+A/593/A37 : Spectral cube toward NGC 6334 I & I(N) (van der Wiel+, 2016)J/A+A/660/A56 : NGC 6334 maps and CO velocity cubes (Arzoumanian+, 2022)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/692/A114https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/692/A114http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/692/A114https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/692/A114https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/692/A114http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/692/A114GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/692/A114/list (List of fits maps)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/692/A114/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/692/A114/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/692/A114/list?GETtext/xml+votable180.050000true260.205664-35.76745780.0055555555555555566/42456https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/692/A114?format=asciiRadiodefaultJ/A+A/692/A114/listList of fits maps_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.raindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.decindexedrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGLONGalactic longitudedegpos.galactic.lonGLATGalactic latitudedegpos.galactic.latNxNumber of pixels along X-axismeta.numberintNyNumber of pixels along Y-axismeta.numberintsizeSize of FITS fileKibytephys.size;meta.fitsintFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fits