J/A+AS/132/181ivo://CDS.VizieR/J/A+AS/132/181CDSWu H.Zou Z.L.Xia X.Y.Deng Z.G.1998-11-07T17:45:52Z1998-11-07T18:44:51ZCDS support team

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

cds-question@unistra.frgalaxiesspectroscopyinfrared-sourcesSpectroscopic observations of a sample of 73 very luminous IRAS galaxies (log(L_IR_/L_{sun}_)>=11.5 for H_0_=50km/s/Mpc, q_0_=0.5) from the 2Jy redshift survey catalogue were carried out using the 2.16m telescope at the Beijing Astronomical Observatory. The observational data, including the optical images (extracted from Digital Sky Survey) and spectra for these galaxies, are presented in paper I (Wu et al., 1998, Cat. <J/A+AS/127/521>). In this paper, we give the spectral and morphological classifications for these very luminous IRAS galaxies (VLIRGs). We show that about 60% of VLIRGs exhibit AGN-like spectra (Seyfert 1s, Seyfert 2s, LINER-like galaxies). This fraction goes up to 82% for the ultraluminous IRAS galaxies (ULIRGs) subsample (Log(L_IR_/ L_{sun}_)>=12.0). 56% of the VLIRGs show strong interaction or merging signatures; this fraction rises to 91% for the ULIRGs. These statistical results strongly suggest that interaction triggers nuclear activities and enhances the infrared luminosity. We find that LINER and a mixture type which have optical properties of both HII galaxies and LINERs could be at the transition stage from infrared luminous HII galaxies to AGNs; their main energy production is from starbursts as well as AGNs. Both infrared luminosities and Ha equivalent widths increase dramatically as nuclear separations between VLIRGs and their nearest neighbors decrease. There is little doubt that strong starbursts happen in the nuclei of VLIRGs. Assuming class 0 as advanced merger, we construct a simple merger sequence, from morphological classes 1 to 4 (with near or far companions), to class 5 and 6 (interacting pairs and mergers) and then to class 0 (isolated galaxies). Along this sequence, VLIRGs evolve from HII galaxies to AGNs.1998A&AS..132..181Whttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+AS/132/181CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+AS/127/521 : Very luminous IRAS galaxies spectra. I. (Wu+ 1998)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+AS/132/181https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+AS/132/181http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+AS/132/181https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+AS/132/181https://vizier.iucaa.in/viz-bin/votable?-source=J/A+AS/132/181http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+AS/132/181GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapInfrareddefaultJ/A+AS/132/181/table1Reddenings, observed and dereddened line ratios and spectral classificationrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintn_IRAS[(] Note on the source origin (1)meta.notecharIRASSource namemeta.id;meta.maincharprimarym_IRASCompanion galaxiesmeta.code.multipcharE(B-V)Galactic extinction E(B-V)magphot.color.excessfloatHa/Hb? Observed H{alpha} to H{beta} ratiophot.flux;arith.ratiofloatnullableu_Ha/Hb[:;] Uncertainty flag on Ha/Hb (2)meta.code.errorcharE(B-V)o? Color excess of VLIRGs from observed Ha/Hbmagphot.color.excessfloatnullableu_E(B-V)o[:;] Uncertainty flag on E(B-V)o (2)meta.code.errorcharlog([OIII]/Hb)? Logarithm of [OIII]5007/Hbspect.line.intensity;arith.ratiofloatnullableu_log([OIII]/Hb)[:;] Uncertainty flag on log([OIII]/Hb) (2)meta.code.errorcharlog([OI]/Ha)? Logarithm of [OI]6300/Haspect.line.intensity;arith.ratiofloatnullableu_log([OI]/Ha)[:;] Uncertainty flag on log([OI]/Ha) (2)meta.code.errorcharlog([NII]/Ha)? Logarithm of [NII]6584/Haspect.line.intensity;arith.ratiofloatnullableu_log([NII]/Ha)[:;] Uncertainty flag on log([NII]/Ha) (2)meta.code.errorcharlog([SII]/Ha)? Logarithm of [SII]6716+6731/Haspect.line.intensity;arith.ratiofloatnullableu_log([SII]/Ha)[:;] Uncertainty flag on log([SII]/Ha) (2)meta.code.errorchar6563/4861Continuum color ratio at 6563A and 4861Aphot.flux.density;arith.ratiofloatu_6563/4861[:;] Uncertainty flag on 6563/4861 (2)meta.code.errorcharSpTypeSpectral types (3)src.spTypecharClassClassification in Verons Catalog (1993, Cat. <VII/166>) (4)src.classcharHa/Hbth? Theoretical Ha and Hb ratiospect.line.intensity;arith.ratiofloatnullablelog([OIII]/Hb)0? Logarithm of dereddened [OIII]5007/Hbspect.line.intensity;arith.ratiofloatnullableu_log([OIII]/Hb)0[:;] Uncertainty flag on log([OIII]/Hb)0 (2)meta.code.errorcharlog([OI]/Ha)0? Logarithm of dereddened [OI]6300/Haspect.line.intensity;arith.ratiofloatnullableu_log([OI]/Ha)0[:;] Uncertainty flag on log([OI]/Ha)0 (2)meta.code.errorcharlog([NII]/Ha)0? Logarithm of dereddened [NII]6584/Haspect.line.intensity;arith.ratiofloatnullableu_log([NII]/Ha)0[:;] Uncertainty flag on log([NII]/Ha)0 (2)meta.code.errorcharlog([SII]/Ha)0? Logarithm of dereddened [SII]6716+6731/Haspect.line.intensity;arith.ratiofloatnullableu_log([SII]/Ha)0[:;] Uncertainty flag on log([SII]/Ha)0 (2)meta.code.errorcharJ/A+AS/132/181/table3Environmental and morphological parametersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintn_IRAS[(] Note on source origin (1)meta.notecharIRASSource namemeta.id;meta.maincharprimarym_IRASCompanion galaxiesmeta.code.multipcharDistDistance of VLIRGs (H_0_=50km/s/Mpc,q_0_=0.5)Mpcpos.distancefloatMType? Morphological types (2)src.morph.typeintnullableSep? Projected separation between the nearest companionskpcpos.angDistancefloatnullableDz? Redshift difference of the nearest companionsrc.redshift;arith.difffloatnullable