J/ApJS/261/34ivo://CDS.VizieR/J/ApJS/261/34doi:10.26093/cds/vizier.22610034CDSHe C.Xu C.K.Domingue D.Cao C.Huang J.-S.2022-11-09T06:35:24Z2022-11-07T13:10:08ZCDS support team

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

cds-question@unistra.frgalaxiesinfrared-sourcesastronomical-modelsgalaxy-classification-systemsphotometryvisible-astronomyredshiftedWe present a study of the bulge-to-total ratio (B/T) of a Ks-band-selected sample of 88 close major-merger pairs of galaxies (H-KPAIR), based on two-dimensional decompositions of SDSS r-band images with GALFIT. We investigate the dependence of the interaction-induced specific star formation rate enhancement (sSFR_enh_) on the B/T ratio, and the effects of this dependence on the differences between star-forming galaxies (SFGs) in spiral+spiral (S+S) and spiral+elliptical (S+E) pairs. Of all the 132 spiral galaxies in H-KPAIR, the 44 in S+E pairs show higher B/T than those in the 44 S+S pairs, with means of B/T=0.35+/-0.05 and B/T=0.26+/-0.03, respectively. There is a strong negative dependence of sSFRenh on the B/T ratio, and only paired SFGs with B/T<0.3 show significant (>5{sigma}) enhancement. Paired SFGs in S+S pairs show a similar trend, and many disky SFGs (B/T<0.1) in S+S pairs have strong sSFR enhancements (sSFR_enh_>0.7dex). For SFGs in S+E pairs, the sSFR has no clear B/T dependence, nor any significant enhancement in any B/T bin. Disky SFGs in S+S pairs show significant (>4{sigma}) enhancement in molecular gas content (M_H2_/M_star_), while SFGs in S+E pairs have no such enhancement in any B/T bin. No significant enhancement of the total gas content (M_gas_/M_star_) is found in any B/T bin for paired galaxies. The star formation efficiency of either the total gas (SFE_gas_=SFR/M_gas_) or molecular gas (SFE_H2_=SFR/M_H2_) does not depend on the B/T ratio. The only significant (>4{sigma}) SFE enhancement found for paired SFGs is the SFEgas for disky SFGs in S+S pairs.2022ApJS..261...34Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/261/34CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)J/ApJS/142/1 : DEEP Groth Strip Survey. II. (Simard+, 2002)J/ApJ/713/330 : Spitzer observations of major-merger galaxies (Xu+, 2010)J/MNRAS/415/32 : COLD GASS survey (Saintonge+, 2011)J/ApJS/196/11 : Bulge+disk decompositions of SDSS galaxies (Simard+, 2011)J/MNRAS/446/3943 : galaxies 2D phot. decompositions in SDSS-DR7 (Meert+, 2015)J/ApJS/222/16 : Major-merger pairs of z<0.1 gal. with Herschel (Cao+, 2016)J/ApJ/829/78 : Dust properties of major-merger gal. pairs (Domingue+, 2016)J/MNRAS/455/2440 : Gal. 2D phot. decompositions in r, g & i (Meert+, 2016)J/A+A/627/A107 : CO obs. of major merger pairs at z=0 (Lisenfeld+, 2019)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/261/34https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/261/34http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/261/34https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/261/34https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/261/34http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/261/34GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/261/34/table1 (GALFIT results of 2MASX Ks-band-selected close major-merger galaxy pair (H-KPAIR))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/261/34/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/261/34/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/261/34/table1?GETtext/xml+votable180.050000true5.10750.82638890.0055555555555555566/4718 4742 4996 5040 5078 5348 5365 5404 5515 5567 5592 5597 5719 5816 5891 5930 5942 6029 6043 6057 6090 6459 6464 6527 7187 7223 7344 8210 8212 8373 8573 9176 9268 9344 9402 9454 9471 9507 9828 9859 9883 9933 9946 9998 10514 10518 10574 10652 10739 10823 10847 10878 10915 10948 11007 11049 11264 11463 11476 11876 11908 17812 18003 18098 23197 25841 25887 25914 25989 25992 26064 26239 26987 27077 27339 27370 27394 27466 27480 27525 27652 27769 27878 28599 28652 28655 30044 32403https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/261/34?format=asciiOpticalInfrareddefaultJ/ApJS/261/34/table1GALFIT results of 2MASX Ks-band-selected close major-merger galaxy pair (H-KPAIR)SimbadNameSimbad column added by the CDSmeta.idcharnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintKPAIRmeta.id.parentcharGIDpGalaxy name (JHHMMSSss+DDMMSSs) from Cao+ 2016, J/ApJS/222/16meta.id;meta.maincharz[0.0065/0.091] Redshift (after the correction for Virgocentric flow)src.redshiftfloatMorphGalaxy morphology (1)src.morphcharmISO[11.85/16.55] Magnitude from SExtractor 25mag/arcsec^2^ isophot or polygon aperturemagphot.mag;meta.modelledfloatmGAL[11.47/16.69] Model magnitude from GALFIT (2)magphot.mag;meta.modelledfloatB/T[0/1] Bulge-to-total ratiophot.mag.sb;arith.ratiofloatmB[12.57/22.31] Bulge magnitudemagphot.mag;meta.modelledfloatnB[1/8] bulge Sersic indexstat.fit.paramfloatre[0/34.4] Bulge effective radius (3)arcsecphys.angSizefloatNEDNED column added by the CDSmeta.ref.urlcharb/aB[0.02/0.98] Bulge axis ratiophys.size.axisRatiofloatPAB[-89.8/89.8] Bulge position angle (4)degpos.posAngfloatmD[11.9/]? Disk magnitudemagphot.mag;meta.modelledfloatnullablers[0/38.5]? Disk scale length (3)arcsecsrc.morph.scLengthfloatnullableb/aD[0.05/1]? Disk axis ratiophys.size.axisRatiofloatnullablePAD[-89.8/88.5]? Disk position angledegpos.posAngfloatnullableChi2[1/1.9]? Reduced chi-squarestat.fit.chi2floatnullableFlag[0/9] binary flag in decimal number (5)meta.code.errorint2MASXDisplay data from the 2MASX (VII/233)meta.ref.urlcharSloanDisplay the online SDSS-DR16 data for the nearest objectmeta.ref.urlchar_RAPositions from names (right ascension part)degpos.eq.ra;meta.main_DEPositions from names (declination part)degpos.eq.dec;meta.main