J/ApJ/643/238ivo://CDS.VizieR/J/ApJ/643/238doi:10.26093/cds/vizier.16430238CDSButt Y.M.Drake J.Benaglia P.Combi J.A.Dame T.Miniati F.,Romero G.E.2008-12-26T21:48:17Z2008-12-26T22:44:14ZCDS support team

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

cds-question@unistra.fropen-star-clustersx-ray-sourcesinfrared-sourcesA 50ks Chandra observation of the unidentified TeV source in Cygnus reported by the HEGRA collaboration reveals no obvious diffuse X-ray counterpart. However, 240 point-like X-ray sources are detected within or nearby the extended TeV J2032+4130 source region, of which at least 36 are massive stars and two may be radio emitters. That the HEGRA source is a composite, having as a counterpart the multiple point-like X-ray sources we observe, cannot be ruled out. Indeed, the distribution of point-like X-ray sources appears nonuniform and concentrated broadly within the extent of the TeV source region. We offer a hypothesis for the origin of the very high energy gamma-ray emission in Cyg OB2 based on the local acceleration of TeV-range cosmic rays and the differential distribution of OB versus less massive stars in this association.2006ApJ...643..238Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/643/238CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/chandra : The Chandra Archive Log (CXC, 1999-)II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/643/238https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/643/238http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/643/238https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/643/238https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/643/238http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/643/238GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/643/238/table1 (Detected sources in Cyg OB2)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/643/238/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/643/238/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/643/238/table1?GETtext/xml+votable180.050000true308.0409916741.43240.0055555555555555566/14692 14693https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/643/238?format=asciiX-rayInfrareddefaultJ/ApJ/643/238/table1Detected sources in Cyg OB2recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[BDB2006]Running X-ray identification numbermeta.id;meta.mainintRAJ2000Chandra Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Chandra Degree of Declination (J2000)pos.eq.dec;meta.mainSNRSignal-to-noise of sourcestat.snrfloatHRHardness ratio (1)phot.flux;arith.ratiofloatCtSource counts from ACIS-Ictphot.count;em.X-rayfloatRA2? 2MASS Hour of Right Ascension (J2000)pos.eq.ranullableDE2? 2MASS Degree of Declination (J2000)pos.eq.decnullable2MASSDisplay the 2MASS data (Cutri et al. 2003, Cat. II/246)meta.ref.urlchar