J/A+A/616/L10ivo://CDS.VizieR/J/A+A/616/L10doi:10.26093/cds/vizier.36169010CDSFigueira M.Bronfman L.Zavagno A.Louvet F.Lo N.Finger R.Rodon J.2018-08-24T07:42:19Z2018-08-21T08:27:47ZCDS support team

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

cds-question@unistra.frh-ii-regionsmillimeter-astronomysubmillimeter-astronomygalaxy-classification-systemsLittle is known about how high-mass stars form. Around 30% of the young high-mass stars in the Galaxy are observed at the edges of ionized (HII) regions. Therefore these are places of choice to study the earliest stages of high-mass star formation, especially towards the most massive condensations. High-spatial resolution observations in the millimeter range might reveal how these stars form and how they assemble their mass. We want to study the fragmentation process down to the 0.01pc scale in the most massive condensation (1700M_{sun}_) observed at the south-western edge of the HII region RCW 120 where the most massive Herschel cores (~124M_{sun}_ in average) could form high-mass stars. Using ALMA 3mm continuum observations towards the densest and most massive millimetric condensation (Condensation 1) of RCW 120, we used the getimages and getsources algorithms to extract the sources detected with ALMA and obtained their physical parameters. The fragmentation of the Herschel cores is discussed through their Jeans mass to understand the properties of the future stars. We extracted 18 fragments from the ALMA continuum observation at 3mm towards 8 cores detected with Herschel, whose mass and deconvolved size range from 2M_{sun}_ to 32M_{sun}_ and from 1.6mpc to 28.8mpc, respectively. The low degree of fragmentation observed, regarding to the thermal Jeans fragmentation, suggests that the observed fragmentation is inconsistent with ideal gravitational fragmentation and other ingredients such as turbulence or magnetic fields should be added in order to explain it. Finally, the range of fragments' mass indicates that the densest condensation of RCW 120 is a favourable place for the formation of high-mass stars with the presence of a probable UCHII region associated with the 27M_{sun}_ Fragment 1 of Core 2.2018A&A...616L..10Fhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/616/L10CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/472/835 : JHKs and GLIMPSE photometry of RCW 120 (Zavagno+, 2007)J/A+A/496/177 : JHKs and GLIMPSE photometry of RCW 120 (Deharveng+, 2009)J/A+A/600/A93 : Multiwavalenth fluxes of RCW120 (Figueira+, 2017)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/616/L10https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/616/L10http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/616/L10https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/616/L10https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/616/L10http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/616/L10GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/616/L10/catalog (List of extracted sources)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/616/L10/catalog?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/616/L10/catalog?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/616/L10/catalog?GETtext/xml+votable180.050000true258.0362665-38.51289770.0055555555555555566/424416.621485433431823e-23 6.621485433431823e-23https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/616/L10?format=asciiMillimeterOpticaldefaultJ/A+A/616/L10/catalogList of extracted sourcesFtotEstimate of total 3mm flux for current source (FXT_BEST01)Jyphot.flux.density;em.mm.50-100GHzdoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[1/19] Source's running number (NO)meta.id;meta.mainintXposX-coordinate of current source (relative to the lower-left pixel (1,1)) (XCO_P)pixpos.cartesian.xfloatYposY-coordinate of current source (relative to the lower-left pixel (1,1)) (YCO_P)pixpos.cartesian.yfloatRAJ2000WCS (J2000) right ascension of current source (WCS_ACOOR)degpos.eq.ra;meta.mainDEJ2000WCS (J2000) declination of current source (WCS_DCOOR)degpos.eq.dec;meta.mainSigniGlobal detection significance over all wavelengths (SIG_GLOB)degstat.fit.goodness;em.wldoubleFGFlag identifying global properties over all wavelengths (FG)meta.codeintGoodGlobal goodness combining SIG_GLOB and SNR_GLOB (GOOD)stat.fit.goodnessfloatSigni1Detection significance from monochromatic single scales (SIG_MONO1)stat.fit.goodnessdoubleFM01Flag identifying monochromatic properties (FM01)meta.codeintFpeakEstimate of 3mm peak flux for current source (in Jy/beam_obs) (FXP_BEST01)Jy/beamphot.flux.density;em.mm.50-100GHzdoublee_FpeakEstimate of peak flux error for current source (in Jy/beam_obs) (FXP_ERRO01)Jy/beamstat.errordoublee_FtotEstimate of total flux error for current source (FXT_ERRO01)Jystat.errordoubleAFWHMMajor size estimate (FWHM) for current source (AFWHM01)arcsecphys.angSize.smajAxisdoubleBFWHMMinor size estimate (FWHM) for current source (BFWHM01)arcsecphys.angSize.sminAxisdoublePAMajor axis rotation angle (east of the vertical axis) (THEPA01)degpos.posAngdoubleAsize2Major size estimate from full intensity moments (ASIZE01)arcsecphys.angSizedoubleBsize2Minor size estimate from full intensity moments (BSIZE01)arcsecphys.angSizedoublePA2Major axis rotation angle (east of the vertical axis) (THETA01)degpos.posAngdouble