J/MNRAS/542/3315ivo://CDS.VizieR/J/MNRAS/542/3315doi:10.26093/cds/vizier/bg-gy-37kCDSDurre M.2026-08-03T07:33:32Z2025-09-15T10:04:45ZCDS support team

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

cds-question@unistra.frseyfert-galaxiesgalaxiesspectroscopyinfrared-sourcesvisible-astronomycatalogsWe study a catalogue of over 130 emission-line galaxies with matched near infra-red (NIR) and optical spectra, where we examine the relationship between the respective nuclear activity classifications, diagnosed by the flux ratios of emission lines. We match the standard NIR classification with four different optical classifications. While there is a broad agreement between the two regimes, there are mismatches and overlaps caused either by aperture effects and/or NIR radiation penetrating obscuring dust and "seeing deeper" into the nuclear region, thus exposing AGN activity. We examine the relationship between the equivalent widths (EW) of H{alpha} and Pa{beta}, as well as the ratios [NII]/H{alpha} vs. [FeII]/Pa{beta}, and find reasonable correlations. We thus propose a new diagnostic (EW of Pa beta with Fe-WPF) in the NIR (analogous to the WHaN classification), using the [FeII]/Pa{beta} flux ratio and the EW of the Pa{beta} line. We show, within the limitations of the catalogue size, that the regions of the standard NIR diagram can be reasonably replicated in this new scheme. This diagnostic has the advantage that only one wavelength range needs to be observed, thus being economical with telescope time.2025MNRAS.542.3315Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/542/3315CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/542/3315https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/542/3315http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/542/3315https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/542/3315https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/542/3315http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/542/3315GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/542/3315/table8 (Infrared and optical emission line flux ratios with activity classifications)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/542/3315/table8?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/542/3315/table8?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/542/3315/table8?GETtext/xml+votable180.050000true294.3876031-6.21800280.0055555555555555566/975 1008 1701 1707 2248 2266 2432 2564 2790 3446 4188 4439 4447 4511 5125 5634 5715 5880 5976 6034 7132 7214 7424 7606 7642 7659 7869 7975 8085 8196 8492 8547 8922 9194 9305 9707 9750 9882 10454 10475 10637 10817 10892 10912 10924 10927 10977 11006 11027 11372 11898 12005 12356 13076 13124 13162 13414 13489 15002 15592 16168 16881 17183 17213 17748 17850 17905 18387 18809 18897 18901 19283 19611 19619 19625 20014 20023 20226 20230 21450 21996 22455 22721 22947 22973 23086 23887 23921 24839 25054 25383 25509 26264 26303 26821 26871 27191 27255 27426 27767 27905 27914 27931 27937 27942 28039 28046 28172 28254 28264 28495 28517 28535 29906 30021 31120 31998 34294 35993 36161 36194 36785 36831 39836 40670 40774 40777 40953 44660 47078 49042https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/542/3315?format=asciiOpticalInfrareddefaultJ/MNRAS/542/3315/table8Infrared and optical emission line flux ratios with activity classificationsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintObjectObject IDmeta.id;meta.maincharCatalogIRNIR Catalog number (1)meta.codeintlog(Fe/Pab)Log [FeII]/Pa{beta} line flux ratiospect.line.intensity;arith.ratiofloate_log(Fe/Pab)Log [FeII]/Pa{beta} line flux ratio uncertaintystat.errorfloatlog(H2/Brg)Log H_2_/Br{gamma} line flux ratiospect.line.intensity;arith.ratiofloate_log(H2/Brg)Log H_2_/Br{gamma} line flux ratio uncertaintystat.errorfloatlog(EWPab)Log Equivalent width of Pa{beta}log(nm)spect.line.eqWidthfloate_log(EWPab)Log Equivalent width of Pa{beta} uncertaintylog(nm)stat.errorfloatIRULFlagFlag for upper limits (5)meta.codecharNIRTypeNIR activity type (6)src.classcharWPFTypeWPF activity type (6)src.classcharNIRFlagFlags on NIR measurements (2)meta.codecharCatalogOptOptical Catalog No. (3)meta.codeintlog(NII/Ha)? Log [NII]/H{alpha} line flux ratiospect.line.intensity;arith.ratiofloatnullablee_log(NII/Ha)? Log [NII]/H{alpha} line flux ratio uncertaintystat.errorfloatnullablelog(SII/Ha)? Log [SII]/H{alpha} line flux ratiospect.line.intensity;arith.ratiofloatnullablee_log(SII/Ha)? Log [SII]/H{alpha} line flux ratio uncertaintystat.errorfloatnullableSimbadSimbad column added by the CDSmeta.ref.urlcharlog(OIII/Hb)? Log [OIII]/H{beta} line flux ratiospect.line.intensity;arith.ratiofloatnullablee_log(OIII/Hb)? Log [OIII]/H{beta} line flux ratio uncertaintystat.errorfloatnullablelog(EWHa)? Log Equivalent width of H{alpha}log(nm)spect.line.eqWidthfloatnullablee_log(EWHa)? Log Equivalent width of H{alpha} uncertaintylog(nm)stat.errorfloatnullableOptTypeKKOptical activity type - Kewley/Kaufmann (6)src.classcharOptTypeSIIOptical activity type - SII (as for Kewley/Kaufmann without COMP)src.classcharOptTypeS06Optical activity type - S06src.classcharOptTypeWHaNOptical activity type - WHaNsrc.classcharOptFlagFlags on optical measurements (4)src.classchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.main