J/ApJ/654/347ivo://CDS.VizieR/J/ApJ/654/347doi:10.26093/cds/vizier.16540347CDSLinsky J.L.Gagne M.Mytyk A.Mccaughrean M.Andersen M.2018-02-02T10:34:12Z2009-02-07T21:50:53ZCDS support team

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

cds-question@unistra.fropen-star-clustersx-ray-sourcesWe present and analyze the first high-resolution X-ray images ever obtained of the Eagle Nebula star-forming region. On 2001 July 30 the Chandra X-Ray Observatory obtained a 78ks image of the Eagle Nebula (M16) that includes the core of the young galactic cluster NGC 6611 and the dark columns of dust and cold molecular gas in M16 known as the "Pillars of Creation". We find a total of 1101 X-ray sources in the 17'x17' ACIS-I field of view. Most of the X-ray sources are low-mass pre-main-sequence or high-mass main-sequence stars in this young cluster. A handful of hard X-ray sources in the pillars are spatially coincident with deeply embedded young stellar objects seen in high-resolution near-infrared images recently obtained with the VLT (McCaughrean & Andersen, 2002A&A...389..513M). In this paper, we focus on the 40 X-ray sources in and around pillars 14 at the heart of the Eagle Nebula. None of the X-ray sources are associated with the evaporating gaseous globules (EGGs) first observed by Hester and coworkers) in HST WFPC2 images of M16, implying either that the EGGs do not contain protostars or that the protostars have not yet become X-ray active. Eight X-ray counts are coincident with the Herbig-Haro object HH 216, implying logLX~30.0.2007ApJ...654..347Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/654/347CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/chandra : The Chandra Archive Log (CXC, 1999-)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/654/347https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/654/347http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/654/347https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/654/347https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/654/347http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/654/347GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/654/347/table2 (*Optical and Near-Infrared Counterparts: WFPC2 Field)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/654/347/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/654/347/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/654/347/table2?GETtext/xml+votable180.050000true274.6978333-13.84547220.005555555555555556Cone search capability for table J/ApJ/654/347/table1 (Chandra X-Ray Sources in M16: WFPC2 Field)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/654/347/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/654/347/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/654/347/table1?GETtext/xml+votable180.050000true274.6978333-13.84536110.0055555555555555566/29463https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/654/347?format=asciiX-raydefaultJ/ApJ/654/347/table2*Optical and Near-Infrared Counterparts: WFPC2 FieldrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[LGM2007]Source numbermeta.idintNameX-ray source name (JHHMMSS.s+DDMMSS)meta.id;meta.maincharRAJ2000? VLT Right ascension (J2000.0)pos.eq.ra;meta.mainnullableDEJ2000? VLT Declination (J2000.0)pos.eq.dec;meta.mainnullableOVLT? Offset with VLT sourcearcsecpos.angDistance;arith.difffloatnullableJsmag? VLT Js magnitudemagphot.mag;em.IR.JfloatnullableHmag? VLT H magnitudemagphot.mag;em.IR.HfloatnullableKsmag? VLT Ks magnitudemagphot.mag;em.IR.KfloatnullableRA2? 2MASS Right ascension (J2000.0)pos.eq.ranullableDE2? 2MASS Declination (J2000.0)pos.eq.decnullableO2M? Offset with 2MASS sourcearcsecpos.angDistance;arith.difffloatnullableJ2mag? 2MASS J magnitudemagphot.mag;em.IR.JfloatnullableH2mag? 2MASS H magnitudemagphot.mag;em.IR.HfloatnullableKs2mag? 2MASS Ks magnitudemagphot.mag;em.IR.KfloatnullableWalk? Walker number, 1961ApJ...133..438W, NGC 6611 NNNmeta.idintnullableBKP? Belikov number, 1999, Cat. <J/A+AS/134/525>, Cl* NGC 6611 BKP NNNNN in Simbadmeta.idintnullableBmag? B magnitudemagphot.mag;em.opt.BfloatnullableVmag? V magnitudemagphot.mag;em.opt.VfloatnullableSpTMK spectral typesrc.spTypecharAV? Absorption in V bandmagphot.mag;em.opt.Vfloatnullable2M2MASS datameta.ref.urlcharJ/ApJ/654/347/table3Chandra Sources in M16: Sugitani et al. (2002ApJ...565L..25S) Matchesn_Sug[c] Note on Sug (2)meta.notecharHmagH magnitudemagphot.mag;em.IR.HfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[LGM2007]Source numbermeta.idintNameSource name (JHHMMSS.s+DDMMSS)meta.id;meta.maincharSugSugitani et al. (2002ApJ...565L..25S) SN IRS designation (1)meta.idcharOffsetOffset between positionsarcsecpos;arith.difffloatCRNet counts ratect/sphot.count;em.X-rayfloatK-SK-S time variability statisticsrc.var.indexfloatEmedMean photon energykeVem.energyfloatfXAbsorpbed 0.5-7.0keV X-ray flux1e-19W.m**-2phot.flux;em.X-rayfloatJmag? J magnitudemagphot.mag;em.IR.JfloatnullableKsmagKs magnitudemagphot.mag;em.IR.KfloatAV? Absorption in V bandmagphot.mag;em.opt.VfloatnullablelogLXUnabsorbed 0.5-7keV luminosity assuming d=2kpc1e-07Wphys.luminosity;em.X-rayfloatT1[*] * indicates objects in WFPC2 fieldmeta.codecharJ/ApJ/654/347/table1Chandra X-Ray Sources in M16: WFPC2 FieldNctNet countsctphot.count;em.X-rayfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[LGM2007]Source numbermeta.idintprimaryNameX-ray source name (JHHMMSS.s+DDMMSS)meta.id;meta.maincharRAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0)pos.eq.dec;meta.mainRctRaw countsctphot.count;em.X-rayinte_Nctrms uncertainty on Nctctstat.errorfloatfX0.5-7.0keV X-ray flux in 10^-16^arg/cm^2^/s (not corrected for absorption)1e-19W.m**-2phot.flux;em.X-rayfloatK-SK-S time variability statisticsrc.var.indexfloatEmedMean photon energykeVem.energyfloatT3[*] * indicates Sugitani matchesmeta.codechar