J/ApJS/257/57ivo://CDS.VizieR/J/ApJS/257/57doi:10.26093/cds/vizier.22570057CDSUeda J.Iono D.Yun M.S.Michiyama T.Watanabe Y.Snell R.L.,Rosa-Gonzalez D.Saito T.Vega O.Yamashita T.2022-06-13T12:55:24Z2022-04-19T08:04:16ZCDS support team

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

cds-question@unistra.frgalaxiesspectroscopymillimeter-astronomysubmillimeter-astronomymolecular-physicsWe present the 3mm wavelength spectra of 28 local galaxy merger remnants obtained with the Large Millimeter Telescope. Sixteen molecular lines from 14 different molecular species and isotopologues were identified, and 21 out of 28 sources were detected in one or more molecular lines. On average, the line ratios of the dense gas tracers, such as HCN(1-0) and HCO^+^(1-0), to ^13^CO(1-0) are 3-4 times higher in ultra/luminous infrared galaxies (U/LIRGs) than in non-LIRGs in our sample. These high line ratios could be explained by the deficiency of ^13^CO and high dense gas fractions suggested by high HCN(1-0)/^12^CO(1-0) ratios. We calculate the IR-to-HCN(1-0) luminosity ratio as a proxy of the dense gas star formation efficiency. There is no correlation between the IR/HCN ratio and the IR luminosity, while the IR/HCN ratio varies from source to source ((1.1-6.5)x10^3^L_{sun}_/(K.km/s.pc^2^)). Compared with the control sample, we find that the average IR/HCN ratio of the merger remnants is higher by a factor of 2-3 than those of the early/mid-stage mergers and nonmerging LIRGs, and it is comparable to that of the late-stage mergers. The IR-to-^12^CO(1-0) ratios show a similar trend to the IR/HCN ratios. These results suggest that star formation efficiency is enhanced by the merging process and maintained at high levels even after the final coalescence. The dynamical interactions and mergers could change the star formation mode and continue to impact the star formation properties of the gas in the postmerger phase.2021ApJS..257...57Uhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/257/57CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/114/2381 : UBVI photometry of NGC 7252 (Miller+, 1997)J/ApJS/206/1 : Mid-IR properties of GOALS nearby LIRGs (Stierwalt+, 2013)J/A+A/579/A101 : 3mm molecular line survey of 8 AGN (Aladro+, 2015)J/A+A/628/A71 : CO spectra of 55 LIRGs and ULIRGs (Herrero-Illana+, 2019)J/ApJ/880/127 : EMPIRE: IRAM 30m dense gas survey (Jimenez-Donaire+, 2019)J/A+A/633/A163 : Mrk 231 CO(1-0) and CN(1-0) line observations (Cicone+, 2020)J/A+A/635/A4 : HCN-to-HNC intensity ratio (Hacar+, 2020)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/257/57https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/257/57http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/257/57https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/257/57https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/257/57http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/257/57GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/257/57/table1 (Merger remnant sub-sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/257/57/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/257/57/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/257/57/table1?GETtext/xml+votable180.050000true0.787521.960280.0055555555555555566/226 2363 4993 5793 7552 8562 9310 10465 11180 11206 11938 16881 17183 20230 20497 22611 22721 24627 24855 25136 31372 38139 38829 43620 46079 46811 47078 47478https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/257/57?format=asciiMillimeterdefaultJ/ApJS/257/57/table1Merger remnant sub-samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSimbadSimbad column added by the CDSmeta.ref.urlcharNEDNED column added by the CDSmeta.ref.urlcharNameSource namemeta.id;meta.maincharprimaryNlNumber of molecular line data for this source (link to Table 3)meta.numberintnullableRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainDistL[13.6/181.7] Luminosity distanceMpcpos.distancefloatScale[65/810] Scalepc/arcsecarith.factorintVsys[980/12840] Systemic velocity, Rothberg & Joseph (2004AJ....128.2098R)km/sphys.velocintl_logLFIRLimit flag on logLFIRmeta.code.errorcharlogLFIR[9.05/12.37] log of FIR luminosity (1)log(solLum)phys.luminosity;em.IRfloatl_logLIRLimit flag on logLIRmeta.code.errorcharlogLIR[9.13/12.52] log of IR luminosity (1)log(solLum)phys.luminosity;em.IRfloatRadCO[1.85/36.9] Radius of maximum CO extent (2)arcsecphys.angSize;stat.max;em.line.COfloatRratio[0.01/16]? Extent of molecular gas to stellar component (2)phys.size;arith.ratiofloatnullablee_Rratio[0.01/3]? Uncertainty in Ratiostat.errorfloatnullableClassClassification ("LIRG": 11 occurrences; "ULIRG": 2 occurrences)src.classcharLumDisplay the luminosity data for this source (link to Table 4)meta.ref.urlintnullableJ/ApJS/257/57/table3Properties of molecular linesLineMolecular Linemeta.id;spect.linecharrms[0.14/0.4] RMS noise level of spectrummKinstr.det.noisefloatNameSource namemeta.id;meta.maincharl_ILimit flag on Imeta.code.errorcharl_SdVLimit flag on SdVmeta.code.errorcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintVlsr[1020/12343]? Central LSR velocity of the molecular linekm/sphys.veloc;pos.lsrintnullablee_Vlsr[1/69]? Uncertainty in Vlsrkm/sstat.error;phys.veloc;pos.lsrintnullablel_TApeaklimit flag for TApeakmeta.code.errorcharTApeak[0.45/36.35] Peak antenna temperaturemKphot.antennaTemp;stat.maxfloate_TApeak[0.14/0.38]? Uncertainty in TApeakmKstat.errorfloatnullablef_TApeaka = tentative detection of linemeta.codecharNch[2/17] Number, channels with >1.5{sigma} (RMS)meta.numberintdV[166/1382] Linewidth, Nch * velocity channel widthkm/sspect.line.widthintI[0.08/9.7] Integrated line intensity or upper limitK.km/sphot.flux.densityfloate_I[0.02/0.11]? Uncertainty on I (1)K.km/sstat.errorfloatnullableSdV[0.58/67.2] Integrated flux density or upper limit (2)Jy.km/sphot.flux.densityfloate_SdV[0.2/0.8]? Uncertainty in SdV (2)Jy.km/sstat.errorfloatnullableJ/ApJS/257/57/table4Molecular line luminositiesl_LHCNLimit flag on LHCNmeta.code.errorcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSource namemeta.id;meta.maincharLHCN[1000000/1500000000] Line luminosity, HCNK.km.s**-1.pc**2phys.luminosity;spect.linefloate_LHCN[3e+06/3e+08]? Uncertainty in LHCNK.km.s**-1.pc**2stat.errorfloatnullablel_LHCO+Limit flag on LHCO+meta.code.errorcharLHCO+[1000000/1400000000] Line luminosity, HCO+K.km.s**-1.pc**2phys.luminosity;spect.linefloate_LHCO+[5e+06/3e+08]? Uncertainty in LHCO+K.km.s**-1.pc**2stat.errorfloatnullablel_LHNCLimit flag on LHNCmeta.code.errorcharLHNC[950000/500000000] Line luminosity, HNCK.km.s**-1.pc**2phys.luminosity;spect.linefloate_LHNC[1e+07/1.1e+08]? Uncertainty in LHNCK.km.s**-1.pc**2stat.errorfloatnullablel_LCOLimit flag on LCOmeta.code.errorcharLCO[1.1e+07/6.6e+09]? Line luminosity, LCOK.km.s**-1.pc**2phys.luminosity;spect.linefloatnullablee_LCO[0/800000000]? Uncertainty in LCOK.km.s**-1.pc**2stat.errorfloatnullableRef? Reference for LCO (1)meta.ref;pos.frameintnullable