J/MNRAS/439/2701ivo://CDS.VizieR/J/MNRAS/439/2701doi:10.26093/cds/vizier.74392701CDSHill M.J.Zakamska N.L.2024-08-08T20:12:48Z2015-03-12T16:43:19ZCDS support team

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

cds-question@unistra.frgalaxiesinfrared-sourcesspectroscopyUltraluminous infrared galaxies (ULIRGs) show on average three times more emission in the rotational transitions of molecular hydrogen than expected based on their star formation rates. Using Spitzer archival data, we investigate the origin of excess warm H_2_ emission in 115 ULIRGs of the IRAS 1Jy sample. We find a strong correlation between H_2_ and [FeII] line luminosities, suggesting that excess H_2_ is produced in shocks propagating within neutral or partially ionized medium. This view is supported by the correlations between H_2_ and optical line ratios diagnostic of such shocks. The galaxies powered by star formation and those powered by active nuclei follow the same relationship between H_2_ and [FeII], with emission line width being the major difference between these classes (~500 and ~1000km/s, respectively). We conclude that excess H_2_ emission is produced as the supernovae and active nuclei drive outflows into the neutral interstellar medium of the ULIRGs. A weak positive correlation between H_2_ and the length of the tidal tails indicates that these outflows are more likely to be encountered in more advanced mergers, but there is no evidence for excess H_2_ produced as a result of the collision shocks during the final coalescence.2014MNRAS.439.2701Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/439/2701CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/121/97 : K-band spectroscopy of ULIRGs (Murphy+, 2001)J/A+A/409/115 : VLA imaging of IRAS 1 Jy ULIRG sample (Nagar+, 2003)J/AJ/131/1942 : 2MASS observations of IRAS 1Jy ULIRGs (Chen+, 2006)J/ApJ/640/167 : AGNs and ULIRGs in the CDF-South (Alonso-Herrero+, 2006)J/MNRAS/375/115 : ULIRGs galaxies in SDSS, 2dF and 6dF (Hwang+, 2007)J/A+A/467/565 : z=1-3 ULIRGs from the Spitzer SWIRE survey (Berta+, 2007)J/ApJ/658/778 : Spitzer mid-IR spectroscopy of z~2 ULIRGs (Yan+, 2007)J/ApJ/674/172 : Oxygen abundances of LIRGs and ULIRGs (Rupke+, 2008)J/MNRAS/405/2505 : Nuclear activity in ULIRGs (Nardini+, 2010)J/MNRAS/414/702 : Optical classification of southern ULIRGs (Lee+, 2011)J/ApJS/203/3 : Spectroscopy of 39 IRAS 1Jy sample ULIRG (Soto+, 2012)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/439/2701https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/439/2701http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/439/2701https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/439/2701https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/439/2701http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/439/2701GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/439/2701/galaxies (Ultra-Luminous IR galaxies with Spitzer spectra: positions, spectra, H_2_ and [FeII] emission, Si absorption, PAH emission, morphological classifications, and optical line measurements (tables 1--5))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/439/2701/galaxies?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/439/2701/galaxies?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/439/2701/galaxies?GETtext/xml+votable180.050000true2.93021-7.368560.0055555555555555566/40 388 4113 4121 4290 4689 4853 5116 5213 5257 5379 5423 5464 5560 5758 7229 7777 8133 8410 8637 8673 8926 9084 9342 9617 9998 10043 10086 10134 10187 10317 10324 10487 10801 11101 11206 11410 11462 11623 11790 16641 16647 16712 16882 17075 17263-17264 17564 17606 17819 18919 19163 19628 20211 20262 20389 21016 22534 23148 25094 25279 25310 25366 25561 25752 25916 26047 26087 26103 26120 26292 26298 26407 26491 26937 27502 27555 27617 27873 27892 28074 28212 28522 31258 31303 31327 31729 34652 34737 34739 35675 35821 35872 36497 36526 36528 36723 43975 44262 44671 44753 47051 48429 48497 48759 49023https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/439/2701?format=asciiInfrareddefaultJ/MNRAS/439/2701/galaxiesUltra-Luminous IR galaxies with Spitzer spectra: positions, spectra, H_2_ and [FeII] emission, Si absorption, PAH emission, morphological classifications, and optical line measurements (tables 1--5)NSProjected Nuclear Separation (1)kpcpos.angDistancefloatOmeta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintzRedshiftsrc.redshiftfloatRAJ2000Right Ascension (J2000.00) (from Spitzer RA_RQST)degpos.eq.ra;meta.mainDEJ2000Declination (J2000.00) (from Spitzer DEC_RQST)degpos.eq.dec;meta.mainMF[0/1] Multiplicative Factor applied to the LL (Long-Low) orders to bring LL flux density in agreement with SL flux density orders at 14umarith.factorfloatLS(1)Luminosity of the S(1) H_2_ emission line1e-07Wphys.luminositydoublee_LS(1)rms uncertainty on LS(1) transition1e-07Wstat.errordoubleLS(3)Luminosity of the S(3) H_2_ emission line1e-07Wphys.luminositydoublee_LS(3)rms uncertainty on LS(3) transition1e-07Wstat.errordoubleTexcExcitation Temperature derived from S(3)-S(1) transitionKphys.atmol.excitationinte_Texcrms uncertainty on TexcKstat.errorintL[FeII]Luminosity of the [FeII]5.34um emission line1e-07Wphys.luminositydoublee_L[FeII]rms uncertainty on L[FeII]1e-07Wstat.errordoubleEWPAHEquivalent Width of PAH[6.2um]umspect.line.eqWidthfloate_EWPAHrms uncertainty on EWPAHumstat.errordoubletau(9.7)Strength of the silicate feature at 9.7umspect.line.intensityfloatL(6.2)Luminosity of PAH[6.2um] emission feature1e+35Wphys.luminosityfloate_L(6.2)rms uncertainty on L(6.2)1e+35Wstat.errorfloatL(7.7)Luminosity of PAH[7.7um] emission feature1e+35Wphys.luminosityfloate_L(7.7)rms uncertainty on L(7.7)1e+35Wstat.errorfloatL(8.5)Luminosity of PAH[8.5um] emission feature1e+35Wphys.luminosityfloate_L(8.5)rms uncertainty on L(8.5)1e+35Wstat.errorfloatL(11.3)Luminosity of PAH[11.3um] emission feature1e+35Wphys.luminosityfloate_L(11.3)rms uncertainty on L(11.3)1e+35Wstat.errorfloatMSMerger Stage (1)meta.code;src.morphnullableTLLength of Tidal Tails (1)kpcsrc.morph.scLengthfloatSpTSpectral Type (2)src.spTypecharHa/Hb? Logarithm of flux of H{alpha} relative to H{beta}spect.line.intensity;arith.ratiofloatnullableW[OIII]? Full width at half-maximum (FWHM) i of [OIII]5007{AA}km/sspect.line.widthfloatnullableOIII/Hb? Logarithm of flux of [OIII]5007{AA} relative to H{beta}spect.line.intensity;arith.ratiofloatnullableNII/Ha? Logarithm of flux of [NII]6583{AA} relative to H{alpha}phot.flux;arith.ratiofloatnullableSII/Ha? Logarithm of flux of the sum of [SII]6716,6721{AA} relative to H{alpha}phot.flux;arith.ratiofloatnullableOI/Ha? Logarithm of flux of [OI]6300{AA} relative to H{alpha}phot.flux;arith.ratiofloatnullableIRASIRAS designation (HHMMm+DDMM, B1950) (from NED)meta.id;meta.maincharprimarym_IRASIRAS component designation (G1)meta.code.multipcharFileNameName of the file with spectrum in subdirectory spmeta.id;meta.filecharspShow the spectrummeta.ref.urlcharJ/MNRAS/439/2701/table6Optical measurements from the SDSS spectra for a sub36 ULIRGsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIRASIRAS designation (HHMMm+DDMM, B1950)meta.id;meta.maincharm_IRASIRAS component (G1)meta.code.multipcharIndex0-based index of the object in Tables 1-5meta.codeintPMFSDSS spectroscopic identification (plate-MJD-fiber)meta.id.crosscharvNaVelocity centroid of the Na D absorption feature relative to the stellar continuumkm/sspect.dopplerVelocintEWNaDEstimated equivalent width of Na D absorption0.1nmspect.line.eqWidthfloatv02Maximal blueshift of the [OIII]5007 emission line v02km/sspect.dopplerVelocintw90Velocity width containing 90% of [OIII]5007 emission line powerkm/sspect.line.widthintSpInteractive spectrum from SDSSmeta.ref.urlchar