J/ApJ/903/91ivo://CDS.VizieR/J/ApJ/903/91doi:10.26093/cds/vizier.19030091CDSYao H.F.M.Jarrett T.H.Cluver M.E.Marchetti L.Taylor E.N.,Santos M.G.Owers M.S.Lopez-Sanchez A.R.Gordon Y.A.Brown M.J.I.,Brough S.Phillipps S.Holwerda B.W.Hopkins A.M.Wang L.2023-07-13T06:42:46Z2022-03-15T07:02:14ZCDS support team

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

cds-question@unistra.frgalaxiesinfrared-astronomyspectroscopyvisible-astronomyWe present a detailed study of emission-line systems in the Galaxy And Mass Assembly (GAMA) G23 region, making use of Wide-field Infrared Survey Explorer (WISE) photometry that includes carefully measured resolved sources. After applying several cuts to the initial catalog of ~41000 galaxies, we extract a sample of 9809 galaxies. We then compare the spectral diagnostic Baldwin, Philips & Terlevich (BPT) classification of 1154 emission-line galaxies (38% resolved in W1) to their location in the WISE color-color diagram, leading to the creation of a new zone for mid-infrared "warm" galaxies located 2{sigma} above the star-forming sequence, below the standard WISE active galactic nucleus (AGN) region. We find that the BPT and WISE diagrams agree on the classification for 85% and 8% of the galaxies as non-AGN (star-forming=SF) and AGN, respectively, and disagree on ~7% of the entire classified sample. Thirty-nine percent of the AGNs (all types) are broad-line systems for which the [NII] and [H{alpha}] fluxes can barely be disentangled, giving in most cases spurious [NII]/[H{alpha}] flux ratios. However, several optical AGNs appear to be completely consistent with SF in WISE. We argue that these could be low-power AGNs, or systems whose hosts dominate the IR emission. Alternatively, given the sometimes high [OIII] luminosity in these galaxies, the emission lines may be generated by shocks coming from super-winds associated with SF rather than AGN activity. Based on our findings, we have created a new diagnostic: [W1-W2] versus [NII]/[H{alpha}], which has the virtue of separating SF from AGNs and high- excitation sources. It classifies 3 to ~5 times more galaxies than the classic BPT.2020ApJ...903...91Yhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/903/91CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/282 : The SDSS Photometric Catalog, Release 6 (Adelman-McCarthy+, 2007)II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)VII/250 : The 2dF Galaxy Redshift Survey (2dFGRS) (2dFGRS Team, 1998-2003)J/ApJS/121/473 : A diagnostic diagram for Seyfert 2 Galaxies (Bassani+, 1999)J/ApJ/642/673 : IR-selected obscured AGN candidates (Polletta+, 2006)J/ApJ/663/81 : SED of hard X-ray selected AGN in XMDS (Polletta+, 2007)J/AJ/136/2373 : Type 2 quasars from SDSS (Reyes+, 2008)J/ApJ/713/970 : Low-resolution SED templates AGNs & galaxies (Assef+, 2010)J/MNRAS/413/971 : Galaxy And Mass Assembly (GAMA) DR1 (Driver+, 2011)J/ApJ/772/26 : AGN with WISE. II. The NDWFS Bootes field (Assef+, 2013)J/ApJS/212/18 : An atlas of UV-to-MIR galaxy SEDs (Brown+, 2014)J/MNRAS/452/2087 : Galaxy And Mass Assembly (GAMA): DR2 (Liske+, 2015)J/ApJ/805/90 : WISE ELIRGs and comparison with QSOs (Tsai+, 2015)J/MNRAS/464/1306 : LARGESS survey (Ching+, 2017)J/MNRAS/474/3875 : Galaxy And Mass Assembly (GAMA): DR3 (Baldry+, 2018)J/ApJ/864/40 : The HIPASS Catalog (HICAT) + WISE galaxies (Parkash+, 2018)J/ApJS/245/25 : WISE Extended Source Catalog (WXSC). I. (Jarrett+, 2019)http://www.gama-survey.org/ : GAMA survey webpagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/903/91https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/903/91http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/903/91https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/903/91https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/903/91http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/903/91GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/903/91/table3 (Measured properties of a representative of galaxies from each activity group)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/903/91/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/903/91/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/903/91/table3?GETtext/xml+votable180.050000true343.58042-33.829370.0055555555555555565/11728 11732 6/16546 16552 16554 46555 46558 46567 46571-46572 46574 46577 46580 46582-46586 46588-46590 46877-46879 46900 46903 46916-46918 46920 46922-46924 46926-46927 46932 46934 46936-46937 46944 46946-46950 46952https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/903/91?format=asciiOpticalInfrareddefaultJ/ApJ/903/91/table3Measured properties of a representative of galaxies from each activity grouprecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGroupActivity group (1)meta.idcharIDGalaxy identifier in GAMA catalogmeta.id;meta.mainintprimaryf_ID[*] Selected galaxies for case study in the next section (16 occurrences)meta.codecharfID[+] Broad-line AGNs (31 occurrences)meta.codecharz[0.005/0.3] Spectroscopic redshift from GAMAsrc.redshiftfloatW1[0.2/15] W1 fluxmJyphot.flux.density;em.IR.3-4umfloate_W1[0.01/0.16] Error on W1mJystat.errorfloatW2[0.1/8] W2 fluxmJyphot.flux.density;em.IR.3-4umfloate_W2[0.01/0.2] Error on W2mJystat.errorfloatW3[0.24/21.3] W3_PAH_ fluxmJyphot.flux.density;em.IR.8-15umfloate_W3[0.07/5] Error on W3mJystat.errorfloatW1-W2[-0.13/1.52] W1-W2 colormagphot.color.excessfloate_W1-W2[0.03/0.2] Error on W1-W2magstat.errorfloatW2-W3[2.04/5.04] W2-W3 colormagphot.color.excessfloate_W2-W3[0.04/0.5] Error on W2-W3magstat.errorfloatOIII/Hb[0.11/12.2] [O_III_]/H{beta}spect.index;em.line.Hbetafloate_OIII/Hb[0.01/2] Error on OIII/Hbstat.errorfloatNII/Ha[0.07/3] [N_II_]/H{alpha}meta.notefloate_NII/Ha[0/0.4] Error on NII/Hastat.errorfloatRAJ2000[339/351] Right ascension (J2000) column added by CDS (sent by the author)degpos.eq.ra;meta.mainDEJ2000[-36/-30] Declination (J2000) column added by CDS (sent by the author)degpos.eq.dec;meta.mainSimbadSimbad column added by the CDSmeta.ref.urlcharDpropDerived properties (table4)meta.ref.urlcharJ/ApJ/903/91/table4Derived properties of a representative the galaxies from each activity groupe_SFR[0.07/69] Error on SFRsolMass/yrstat.error;phys.SFRfloatLOIII[39.4/43]? log [O_III_] luminosityerg/sphys.luminosityfloatnullablee_LOIII[0/0.3]? Error on LOIIIerg/sstat.errorfloatnullablesSFR[-10.5/-8.81] Specific star-formation rateyr**-1phys.SFRfloate_sSFR[0.1/0.5] Error on sSFRyr**-1stat.errorfloatIDGalaxy identifier in GAMA catalogmeta.id;meta.mainintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGroupActivity group (1)meta.idcharf_ID[*] Selected galaxies for case study in the next section (16 occurrences)meta.codecharfID[+] Broad-line AGNs (31 occurrences)meta.codecharMass[9.05/11.9] Log mass (2)solMassphys.massfloate_Mass[0.08/0.4] Error on MasssolMassstat.error;phys.massfloatSFR[0.15/175] Star forming rate at 12{mu}m (3)solMass/yrphys.SFRfloat