J/ApJ/725/842ivo://CDS.VizieR/J/ApJ/725/842doi:10.26093/cds/vizier.17250842CDSLeonidaki I.Zezas A.Boumis P.2018-02-02T12:30:34Z2018-01-29T14:52:44ZCDS support team

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

cds-question@unistra.frgalaxiessupernova-remnantsx-ray-sourcesphotometrytwo-color-diagramsspectroscopyWe present results from a study of the supernova remnant (SNR) population in a sample of six nearby galaxies (NGC 2403, NGC 3077, NGC 4214, NGC 4449, NGC 4395, and NGC 5204) based on Chandra archival data. We have detected 244 discrete X-ray sources down to a limiting flux of 10^-15^ erg/s/cm^2^. We identify 37 X-ray-selected thermal SNRs based on their X-ray colors or spectra, 30 of which are new discoveries. In many cases, the X-ray classification is confirmed based on counterparts with SNRs identified in other wavelengths. Three of the galaxies in our sample (NGC 4214, NGC 4395, and NGC 5204) are studied for the first time, resulting in the discovery of 13 thermal SNRs. We discuss the properties (luminosity, temperature, and density) of the X-ray-detected SNRs in the galaxies of our sample in order to address their dependence on their environment. We find that X-ray-selected SNRs in irregular galaxies appear to be more luminous than those in spirals. We attribute this to the lower metallicities and therefore more massive progenitor stars of irregular galaxies or the higher local densities of the interstellar medium. We also discuss the X-ray-selected SNR populations in the context of the star formation rate of their host galaxies. A comparison of the numbers of observed luminous X-ray-selected SNRs with those expected based on the luminosity functions of X-ray SNRs in the Magellanic Clouds and M33 suggest different luminosity distributions between the SNRs in spiral and irregular galaxies with the latter tending to have flatter distributions.2010ApJ...725..842Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/725/842CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/155 : Third Reference Cat. of Bright Galaxies (RC3)B/chandra : The Chandra Archive Log (CXC, 1999-2014)J/ApJ/573/306 : Radio emission from supernovae (Eck+, 2002)J/ApJ/649/730 : ULX population in nearby galaxies from XMM (Winter+, 2006)J/AJ/137/3869 : Radio SNRs in 4 irregular galaxies (Chomiuk+, 2009)J/AJ/139/1066 : X-ray view of NGC 2403 central region (Yukita+, 2010)J/A+A/549/A70 : NGC 4214 multiband images (Hermelo+, 2013)J/MNRAS/429/189 : SNRs in six nearby galaxies (Leonidaki+, 2013)J/A+A/569/A68 : Green Bank Telescope observations of NGC 2403J/AJ/150/94 : Chandra Local Volume Survey. I. (Binder+, 2015)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/725/842https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/725/842http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/725/842https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/725/842https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/725/842http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/725/842GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/725/842/table1 (*Properties of Our Galaxies)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/725/842/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/725/842/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/725/842/table1?GETtext/xml+votable180.050000true114.21416765.60250.005555555555555556Cone search capability for table J/ApJ/725/842/Photometry (Photometric Properties of Potential SNRs)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/725/842/Photometry?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/725/842/Photometry?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/725/842/Photometry?GETtext/xml+votable180.050000true150.82387568.73793610.0055555555555555566/7604 7741 7743 10911 11127 28535 28631https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/725/842?format=asciiX-rayOpticaldefaultJ/ApJ/725/842/table1*Properties of Our GalaxiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNGCGalaxy name (NNNN)meta.id.parentintRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainDistDistanceMpcpos.distance;pos.heliocentricfloatn_Dist[efghi] Note on Dist (1)meta.notecharamajMajor axisarcminphys.angSizefloatbminMinor axisarcminphys.angSize;srcfloatIncl[37/62]? Inclination (2)degsrc.orbital.inclinationintnullableNHGalactic hydrogen column density (3)1e+20cm**-2phys.columnDensity;pos.galacticfloatGLAT[29/82] Galactic latitudedegpos.galactic.latintPA[5/147]? Position angle (4)degpos.posAngintnullableTypeType (5)src.classcharScalePhysical scale corresponding to 0.5" at the distance of each galaxypcinstr.scalefloatRC3Display the RC3 data (de Vaucouleurs et al. 1995, Cat. VII/155)meta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlcharNEDNED column added by the CDSmeta.ref.urlcharJ/ApJ/725/842/PhotometryPhotometric Properties of Potential SNRsNGCHost galaxy namemeta.id.parentcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDSource identifier (LZB_NNN)meta.id;meta.maincharRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainSctsObsPhotometric counts in the soft band (G1)ctphot.count;em.X-rayintSctsBkgBackground counts in the soft band (G1)ctinstr.background;em.X-ray.softintMctsObsPhotometric counts in the medium band (G1)ctphot.count;em.X-rayintMctsBkgBackground counts in the medium band (G1)ctinstr.backgroundintHctsObsPhotometric counts in the hard band (G1)ctphot.count;em.X-rayintHctsBkgBackground counts in the hard band (G1)ctinstr.background;em.X-ray.hardintTctsObsPhotometric counts in the total band (G1)ctphot.count;em.X-rayintTctsBkgBackground counts in the total band (G1)ctinstr.backgroundintAreaArea ratio (background/source)phys.angSizefloatEffAreaEffective area ratio with respect to a reference point (see Section 3.3) in the soft-energy bandphys.angSizefloatJ/ApJ/725/842/Spectral-fitSpectral-fitting Results of the Point SourcesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStatStatistics used, {Chi}^2^ or Cashmeta.id;stat.fitNGCHost galaxy namemeta.id.parentcharIDSource identifier (LZB_NNN)meta.id;meta.maincharIDobs? The observation ID used (NNNN) (only in tables 20-22)meta.id;obsintnullableModelFitted model (apec, PL, bbody) (1)stat.param;meta.modelledcharNHI? H I column density1e+22cm**-2phys.columnDensityfloatnullablen_NHI[a] Note on NHI (2)meta.notecharE_NHI? Upper limit uncertainty in NHI1e+22cm**-2stat.error;stat.maxfloatnullablee_NHI? Lower limit uncertainty in NHI1e+22cm**-2stat.errorfloatnullablel_Gamma[>] Limit flag on Gammameta.code.errorcharGamma? Best-fit value of the power-law photon index {Gamma}meta.code;spect.index;meta.modelledfloatnullableE_Gamma? Upper limit unncertainty in Gammastat.error;stat.maxfloatnullablee_Gamma? Lower limit uncertainty in Gammastat.errorfloatnullablel_kT[>] Limit flag on kTmeta.code.error;phys.energycharkT? Thermal component temperaturekeVphys.temperaturefloatnullablel_E_kT[>] Limit flag on E_kTmeta.code.errorcharE_kT? Upper limit unncertainty in kTkeVstat.error;stat.maxfloatnullablee_kT? Lower limit uncertainty in kTkeVstat.error;phys.energyfloatnullablel_Norm[>] Limit flag on Normmeta.code.errorcharNormNormalization factor given in units of 10^-5^A (3)stat.fit.paramfloatE_Norm? Upper limit unncertainty in Normstat.error;stat.maxfloatnullablee_Norm? Lower limit uncertainty in Normstat.errorfloatnullableChi2? {Chi}^2^ valuestat.fit.chi2floatnullableDOF[4/1069]? Degrees of freedomstat.fit.dofintnullableCash? Cash statisticsstat.fit.paramfloatnullableGood? Goodness-of-fit for Cash statistics%stat.fit.goodnessfloatnullableFabs? Absorbed flux in 0.3-10 keV band (in 10^-15^ erg/s/cm^2^)1e-18W.m**-2phot.flux;em.X-rayfloatnullableFunabs? Unabsorbed flux in 0.3-10 keV band (in 10^-15^ erg/s/cm^2^)1e-18W.m**-2phot.flux;em.X-rayfloatnullablelogL? Unabsorbed luminosity (0.3-10.0 keV) using Funabs and the distances from table1 (in erg/s)1e-07Wphys.luminosity;em.X-rayfloatnullableClassSource classification based on the X-ray spectral fitssrc.classcharn_ClassNote on Class (4)meta.notecharJ/ApJ/725/842/ColorsX-ray Colors for Potential SNRsNGCHost galaxy namemeta.id.parentcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDSource identifier (LZB_NNN)meta.id;meta.maincharCol(S/M)X-ray color in the soft/medium band (G1)phot.count;arith.ratiofloatE_Col(S/M)Upper limit uncertainty in Col(S/M) (G1)stat.error;stat.maxfloate_Col(S/M)Lower limit uncertainty in Col(S/M) (G1)stat.errorfloatCol(M/H)X-ray color in the medium/hard band (G1)phot.count;arith.ratiofloatE_Col(M/H)Upper limit uncertainty in Col(M/H) (G1)stat.error;stat.maxfloate_Col(M/H)Lower limit uncertainty in Col(M/H) (G1)stat.errorfloatCol(S/H)X-ray color in the soft/hard band (G1)phot.count;arith.ratiofloatE_Col(S/H)Upper limit uncertainty in Col(S/H) (G1)stat.error;stat.maxfloate_Col(S/H)Lower limit uncertainty in Col(S/H) (G1)stat.errorfloatSpectrum[Yes No] Available X-ray spectrum? (see Section 3.4.2)meta.codecharClassClassification of the source according to its spectrum (see Sections 3.4.2 and 4)src.classcharn_Class[ab] Note on Class (1)meta.notecharAssocMulti-wavelength association (2)src.classcharn_AssocNote on Assoc (3)meta.notechar