J/MNRAS/437/1561ivo://CDS.VizieR/J/MNRAS/437/1561doi:10.26093/cds/vizier.74371561CDSRivilla V.M.Jimenez-serra I.Martin-pintado J.Sanz-forcada J.2024-08-07T20:12:18Z2015-01-16T08:44:36ZCDS support team

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

cds-question@unistra.frstellar-associationsx-ray-sourcespre-main-sequence-starsWe have studied the young low-mass pre-main sequence (PMS) stellar population associated with the massive star-forming region DR 21 by using archival X-ray Chandra observations and by complementing them with existing optical and infrared (IR) surveys. The Chandra observations have revealed for the first time a new highly extincted population of PMS low-mass stars previously missed in observations at other wavelengths. The X-ray population exhibits three main stellar density peaks, coincident with the massive star-forming regions, being the DR 21 core the main peak. The cross-correlated X-ray/IR sample exhibits a radial 'Spokes-like' stellar filamentary structure that extends from the DR 21 core towards the northeast. The near-IR data reveal a centrally peaked structure for the extinction, which exhibits its maximum in the DR 21 core and gradually decreases with the distance to the N-S cloud axis and to the cluster centre. We find evidence of a global mass segregation in the full low-mass stellar cluster, and of a stellar age segregation, with the youngest stars still embedded in the N-S cloud, and more evolved stars more spatially distributed. The results are consistent with the scenario where an elongated overall potential well created by the full low-mass stellar cluster funnels gas through filaments feeding stellar formation. Besides the full gravitational well, smaller scale local potential wells created by dense stellar sub-clusters of low-mass stars are privileged in the competition for the gas of the common reservoir, allowing the formation of massive stars. We also discuss the possibility that a stellar collision in the very dense stellar cluster revealed by Chandra in the DR 21 core is the origin of the large-scale and highly energetic outflow arising from this region.2014MNRAS.437.1561Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/437/1561CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJS/182/143 : SCUPOL Legacy polarimetry of SCUBA (Matthews+, 2009)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/437/1561https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/437/1561http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/437/1561https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/437/1561https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/437/1561http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/437/1561GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/437/1561/table2 (DR 21 Chandra source catalogue, with SDSS, UKIDSS and Spitzer counterparts)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/437/1561/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/437/1561/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/437/1561/table2?GETtext/xml+votable180.050000true309.750166742.32688890.0055555555555555566/14682 14704https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/437/1561?format=asciiX-raydefaultJ/MNRAS/437/1561/table2DR 21 Chandra source catalogue, with SDSS, UKIDSS and Spitzer counterpartsSeq[1/281] DR21 X sequential numbermeta.recordintprimaryRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainCounts[2/320] X-ray countsctphot.count;em.X-rayintlogLX? X-ray luminosity (not corrected from extinction)log(1e-07W)phys.luminosity;em.X-rayfloatnullableSDSSSDSS counterpart name (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharUKIDSSUKIDSS counterpart name (JHHMMSS.ss+DDMMSS.s)meta.idcharSSTCYGXSpitzer-SSTCYGX counterpart name (JHHMMSS.ss+DDMMSS.s)meta.idcharSimbadSimbad column added by the CDSmeta.ref.urlchar