J/A+A/561/A83ivo://CDS.VizieR/J/A+A/561/A83doi:10.26093/cds/vizier.35610083CDSPeretto N.Fuller G.A.Andre P.Arzoumanian D.Rivilla V.M.Bardeau S.,Duarte Puertas S.Guzman Fernandez J.P.Lenfestey C.Li G.X.,Olguin F.A.Rock B.R.de Villiers H.Wiliams J.2017-06-29T08:56:07Z2014-01-06T08:13:41ZCDS support team

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

cds-question@unistra.frnebulaeinfrared-sourcesinterstellar-mediumspectroscopyFormation of stars is now believed to be tightly linked to the dynamical evolution of interstellar filaments in which they form. In this paper we analyze the density structure and kinematics of a small network of infrared dark filaments, SDC13, observed in both dust continuum and molecular line emission with the IRAM 30m telescope. These observations reveal the presence of 18 compact sources amongst which the two most massive, MM1 and MM2, are located at the intersection point of the parsec-long filaments. The dense gas velocity and velocity dispersion observed along these filaments show smooth, strongly correlated, gradients. We discuss the origin of the SDC13 velocity field in the context of filament longitudinal collapse. We show that the collapse timescale of the SDC13 filaments (from 1Myr to 4Myr depending on the model parameters) is consistent with the presence of Class I sources in them, and argue that, on top of bringing more material to the centre of the system, collapse could generate additional kinematic support against local fragmentation, helping the formation of starless super-Jeans cores. SDC13 is composed of three Spitzer Dark Clouds from the Peretto & Fuller (2009, cat J/A+A/505/405) catalogue (SDC13.174-0.07, SDC13.158-0.073, SDC13.194-0.073).2014A&A...561A..83Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/561/A83CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/505/405 : A catalogue of Spitzer dark clouds (Peretto+, 2009)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/561/A83https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/561/A83http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/561/A83https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/561/A83https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/561/A83http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/561/A83GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/561/A83/table5 (N_2_H^+^(1-0) spectra properties)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/561/A83/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/561/A83/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/561/A83/table5?GETtext/xml+votable180.050000true273.6470417-17.57830560.0055555555555555566/29112https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/561/A83?format=asciiOpticalInfrareddefaultJ/A+A/561/A83/table5N_2_H^+^(1-0) spectra propertiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSpSpectrum position number (PNN)meta.idcharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainVelSpectrum best-fit velocitykm/sphys.veloc;pos.lsrfloatFWHMSpectrum best-fit line widthkm/sspect.line.width;meta.modelledfloatsig.ntNon-thermal velocity dispersion componentkm/sphys.veloc.dispersionfloatsig.totTotal (thermal+non-thermal) velocity dispersionkm/sphys.veloc.dispersionfloatNameName, as in sd13n2hp.fit filemeta.id;meta.maincharspPlot of spectrummeta.ref.urlchar