J/A+A/686/A223ivo://CDS.VizieR/J/A+A/686/A223doi:10.26093/cds/vizier.36860223CDSPulatova N.G.Rix H.-W.Tugay A.V.Zadorozhna L.V.Seeburger R.,Demianenko M.2026-03-03T13:21:58Z2024-06-14T10:45:16ZCDS support team

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

cds-question@unistra.frx-ray-sourcesgalaxiesquasarsvisible-astronomyspectroscopyWe present a study of 1347 galaxies at z<0.35 with detected nuclear X-ray emission and optical emission line diagnostics in the Baldwin-Phillips-Terlevich (BPT) diagram. This sample was obtained by cross-matching the X-ray Multi-Mirror Mission Observatory - Newton (XMM-Newton) DR10 catalogue with Sloan Digital Sky Survey (SDSS) DR17 galaxies with well-measured line ratios. The distribution of these sources in the BPT diagram covers all three excitation regimes: Ionized Hydrogen (HII) regions (23%), 'composites' (30%), and Seyfert galaxies with the low ionization nuclear emission line regions (LINERs) (47%). In contrast, the fraction of objects classified as active galactic nuclei (AGN) in the SDSS subsample selected for cross-match with XMM-Newton is only 13%. This fact illustrates that X-ray emission from galaxies commonly points towards the presence of AGN. Our data show, for the first time, a clear dependence of the BPT position on the ratio of the X-ray to H{alpha} fluxes. Sources dominated by X-ray emission lie in the Seyfert and LINER regimes of the BPT diagram. Most sources with a low X-ray-to-H{alpha}-luminosity ratio, log10(LX/LH{alpha})<1.0, lie in the HII regime. In our sample, there are even 45 galaxies that have L^Star^_XR_/L^Total^_Xray_>0.5. In contrast, the positions of the sample members in the BPT diagram exhibit no dependence on the X-ray hardness ratio. Our finding suggests that the X-ray-to-H{alpha} ratio can help us to differentiate galaxies whose X-ray flux is dominated by an AGN from galaxies with central X-ray binaries and other stellar X-ray sources.2024A&A...686A.223Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/686/A223CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toIX/63 : XMM-Newton Serendipitous Source Catalogue 4XMM-DR10 (Webb+, 2022)https://www.sdss4.org/dr17/ : SDSS DR17 Home Pagehttp://xmmssc.irap.omp.eu/Catalogue/4XMM-DR10/4XMM_DR10.html 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28430 28443 28467 28471 28476 28478 28490 28492 28495-28497 28515-28517 28522 28529 28534-28535 28593 28609 28632 30033 31354 31406 31426 31430 31463 31465 31484 31628 31656 31663 31667 31712 31717 32500 36733 36767 36777-36778 36780 36782 36785 36861 45044 45054 49094 49123https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/686/A223?format=asciiX-rayOpticaldefaultJ/A+A/686/A223/catalogX-ray-selected galaxies from SDSSrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameObject's name (main_id) (1)meta.id;meta.maincharRAJ2000Right ascension, J2000 (ra) (1)degpos.eq.ra;meta.mainDEJ2000Declination, J2000 (dec) (1)degpos.eq.dec;meta.mainzRedshift (z) (1)src.redshiftdoubleSimbadNameSimbad column added by the CDSmeta.idcharnullableFHbetaFlux in Hbeta line (h_beta_flux) (1)1e-30W.m**-2phot.flux;em.line.Hbetadoublee_FHbetaError in the Hbeta flux (h_beta_flux_err) (1)1e-30W.m**-2stat.errordoubleFHalphaFlux in Halpha line (h_alpha_flux) (1)1e-30W.m**-2phot.flux;em.line.Halphadoublee_FHalphaError in the Halpha flux (h_alpha_flux_err) (1)1e-30W.m**-2stat.errordoubleFOIII5007Flux in OIII 5007 line (oiii_5007_flux) (1)1e-30W.m**-2phot.flux;spect.linedoublee_FOIII5007Error in the OIII 5007 flux (oiii_5007_flux_err) (1)1e-30W.m**-2stat.errordoubleFOI6300Flux in OI 6300 line (oi_6300_flux) (1)1e-30W.m**-2phot.flux;spect.linedoublee_FOI6300Error in the OI 6300 flux (oi_6300_flux_err) (1)1e-30W.m**-2stat.errordoubleFNII6548Flux in NII 6584 line (nii_6548_flux) (1)1e-30W.m**-2phot.flux;spect.linedoublee_FNII6548Error in the NII 6548 flux (nii_6548_flux_err) (1)1e-30W.m**-2stat.errordoubleFNII6584Flux in NII 6584 line (nii_6584_flux) (1)1e-30W.m**-2phot.flux;spect.linedoublee_FNII6584Error in the NII 6584 flux (nii_6584_flux_err) (1)1e-30W.m**-2stat.errordoubleFSII6717Flux in SII 6717 line (sii_6717_flux) (1)1e-30W.m**-2phot.flux;spect.linedoublee_FSII6717Error in the SII 6717 flux (sii_6717_flux_err) (1)1e-30W.m**-2stat.errordoubleFSII6731Flux in SII 6731 line (sii_6731_flux) (1)1e-30W.m**-2phot.flux;spect.linedoublee_FSII6731Error in the SII 6731 flux (sii_6731_flux_err) (1)1e-30W.m**-2stat.errordoubleFSCEP8The mean total band flux (0.2-12keV) (in erg/s/cm^2^ unit) (SC_EP_8_FLUX) (2)mW.m**-2phot.flux;em.X-raydoublee_FSCEP8Error on the weighted mean total band flux (in erg/s/cm^2^ unit) (SC_EP_8_FLUX_ERR) (2)mW.m**-2stat.errordoubleSCHR1? The mean hardness ratio of the bands 1 and 2 (SC_HR1) (2)phot.flux;stat.meandoublenullablee_SCHR1? Error on the weighted mean hardness ratio SCHR1 (SC_HR1_ERR) (2)stat.errordoublenullableSCHR2The mean hardness ratio of the bands 2 and 3 (SC_HR2) (2)phot.flux;stat.meandoublee_SCHR2Error on the weighted mean hardness ratio SCHR2 (SC_HR2_ERR) (2)stat.errordoubleSCHR3The mean hardness ratio of the bands 3 and 4 (SC_HR3) (2)phot.flux;stat.meandoublee_SCHR3Error on the weighted mean hardness ratio SCHR3 (SC_HR3_ERR) (2)stat.errordoubleSCHR4? The mean hardness ratio of the bands 4 and 5 (SC_HR4) (2)phot.flux;stat.meandoublenullablee_SCHR4? Error on the weighted mean hardness ratio SCHR4 (SC_HR4_ERR) (2)stat.errordoublenullableSepDistance between matched objects along a great circle (Separation) (2)arcsecpos.angDistancedouble