J/ApJS/187/495ivo://CDS.VizieR/J/ApJS/187/495doi:10.26093/cds/vizier.21870495CDSLong K.S.Blair W.P.Winkler P.F.Becker R.H.Gaetz T.J.Ghavamian P.,Helfand D.J.Hughes J.P.Kirshner R.P.Kuntz K.D.McNeil E.K.,Pannuti T.G.Plucinsky P.P.Saul D.Tullmann R.Williams B.2017-10-13T15:41:43Z2011-02-16T13:19:00ZCDS support team

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

cds-question@unistra.frgalaxiesvisible-astronomyx-ray-sourcessupernova-remnantsgalaxy-classification-systemsM33 contains a large number of emission nebulae identified as supernova remnants (SNRs) based on the high [SII]:H{alpha} ratios characteristic of shocked gas. Using Chandra data from the ChASeM33 survey with a 0.35-2keV sensitivity of ~2x10^34^erg/s, we have detected 82 of 137 SNR candidates, yielding confirmation of (or at least strongly support for) their SNR identifications. A spectral analysis of the seven X-ray brightest SNRs reveals that two, G98-31 and G98-35, have spectra that appear to indicate enrichment by ejecta from core-collapse supernova explosions. We have used a combination of new and archival optical and radio observations to attempt to better understand why some objects are detected as X-ray sources and others are not. We have also developed a morphological classification scheme for the optically identified SNRs and discussed the efficacy of this scheme as a predictor of X-ray detectability. Finally, we have compared the SNRs found in M33 to those that have been observed in the Galaxy and the Magellanic Clouds.2010ApJS..187..495Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/187/495CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJS/120/247 : Supernova remnants in M33 (Gordon+, 1999)J/A+A/426/11 : XMM-Newton survey of M33 (Pietsch+, 2004)J/AJ/131/2478 : M31 and M33 UBVRI photometry (Massey+, 2006)J/ApJS/174/366 : Chandra ACIS survey of M33 (ChaSeM33) (Plucinsky+, 2008)http://www.lowell.edu/users/massey/lgsurvey : Online data from the LGGShttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/187/495https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/187/495http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/187/495https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/187/495https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/187/495http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/187/495GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/187/495/table3 (M33 SNRs and SNR candidates - basic data)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/187/495/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/187/495/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/187/495/table3?GETtext/xml+votable180.050000true23.126541730.46302780.0055555555555555566/2154 2155 2241https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/187/495?format=asciiX-rayOpticaldefaultJ/ApJS/187/495/table3M33 SNRs and SNR candidates - basic dataMph[A"ABC ] Optical morphology (2)meta.code;src.morphcharGDK99meta.ref.urlcharDEJ2000Degree of declination (J2000)pos.eq.dec;meta.mainrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintXSimbad column added by the CDSmeta.ref.urlcharNameObject name (<[LBW2010] NNN> in Simbad)meta.id;meta.maincharprimaryONameOther designation (G1)meta.idcharRAJ2000Hour of right ascension (J2000)pos.eq.ra;meta.mainDiamDiameter (1)pcpos.distanceintEnv[1-3] Environment class (3)meta.code.classintRad[ync?] Radio source? (4)meta.codecharSBH{alpha} surface brightness (5)mW.m**-2.arcsec**-2phot.mag.sbdoubleLHaH{alpha} luminosity (5)1e-07Wphys.luminosity;em.line.Halphadoublel_[NII]Limit flag on [NII]meta.code.errorchar[NII]? [NII]/H{alpha} flux ratio (6548,6583)phot.flux;arith.ratiofloatnullable[SII]? [SII]/H{alpha} flux ratio (6717,6731)phot.flux;arith.ratiofloatnullable[SII]r? Line ratio of [SII]6717,6731phot.flux;arith.ratiofloatnullableRefSpectroscopic reference (6)meta.ref;pos.parallax.spectcharf_Ref[,a-c ] Flag on Ref (7)meta.codecharSimbadNameSimbad column added by the CDSmeta.idcharJ/ApJS/187/495/table4M33 SNRs and SNR candidates - X-ray resultsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameObject name (<[LBW2010] NNN> in Simbad)meta.id;meta.maincharONameOther designation (G1)meta.idcharExpExposure timekstime.duration;obs.exposurefloatAngAngle (1)arcminpos.posAngfloatCtsCounts in the 0.35-2.0keV bandctphot.count;em.X-rayfloate_CtsCts uncertaintyctstat.errorfloatl_LxLimit flag on Lx (2)meta.code.errorcharLx0.35-2.0keV luminosity (2)phys.luminosity;em.X-raydoubleHR? Hardness ratio (3)phot.flux;arith.ratiofloatnullable