J/AJ/121/97ivo://CDS.VizieR/J/AJ/121/97doi:10.26093/cds/vizier.51210097CDSMurphy T.W.JRSoifer B.T.Matthews K.Armus L.Kiger J.R.2023-04-06T16:50:44Z2005-05-08T16:32:28ZCDS support team

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

cds-question@unistra.frgalaxiesinfrared-sourcesspectroscopyWe present near-infrared spectroscopy for a complete sample of 33 ultraluminous infrared galaxies at a resolution of R~1000. Most of the wavelength range from 1.80-2.20{mu}m in the rest frame is covered, including the Pa{alpha} and Br{gamma} hydrogen recombination lines, and the molecular hydrogen vibration-rotation 1-0 S(1) and S(3) lines. Other species, such as He I, [Fe II], and [Si VI] appear in the spectra as well, in addition to a number of weaker molecular hydrogen lines. Nuclear extractions for each of the individual galaxies are presented here, along with spectra of secondary nuclei, where available. The Pa{alpha} emission is seen to be highly concentrated on the nuclei, typically with very little emission extending beyond a radius of 1kpc. This survey was carried out primarily to search for signatures of active nuclei via velocity-broadened hydrogen recombination or the presence of the [Si VI] coronal line. These signatures are rare in the present sample, occurring in only two of the 33 galaxies. The extinction to the hydrogen recombination lines is investigated via the Pa{alpha}/Br{gamma} line ratio. It is found that visual extinctions to the nuclei in excess of 10mag are relatively common among ULIRGs and that visual extinctions greater than 25mag are necessary to conceal a QSO emitting half the total bolometric luminosity. The ionized hydrogen regions in many ULIRGs are sufficiently obscured that dust-enshrouded active galactic nuclei would remain hidden at 2{mu}m at the current level of sensitivity. The vibration-rotation lines of molecular hydrogen appear to be predominantly thermal in origin, with effective temperatures generally around 2200K. The relative nuclear velocities between double nucleus ULIRGs are investigated, through which it is inferred that the maximum deprojected velocity difference is ~200km.s-1. This figure is lower than the velocities predicted by physical models of strong interactions/mergers of large, gas-rich galaxies.2001AJ....121...97Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/121/97CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/121/97https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/121/97http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/121/97https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/121/97https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/121/97http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/121/97GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/121/97/sample (Spectroscopic Survey Sample (tables 1 and 5))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/121/97/sample?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/121/97/sample?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/121/97/sample?GETtext/xml+votable180.050000true7.22583343.1377780.0055555555555555566/2555 2716 5116 5560 5843 5852 6653 7300 8283 9770 10134 10187 11410 13632 14854 17075 18962 20389 22893 23525 26298 26937 27617 29985 30008 30565 31258 40468 40734 40801 44623 44671 48759https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/121/97?format=asciiInfrareddefaultJ/AJ/121/97/sampleSpectroscopic Survey Sample (tables 1 and 5)recnoRecord number assigned by the VizieR team. Should Not be used for identification.intNameGalaxy Namecharprimaryn_NameNote (1)charczGalaxy redshiftkm/sintLumIRIR luminosity in solar unitslog(solLum)floatSep? Separation of nucleiarcsecfloatnullablen_Sep[SD] Nucleus structure (2)charSimbadSimbad column added by the CDScharNEDSimbad column added by the CDScharAvExtinction based on Pa{alpha}/Br{gamma}magfloate_AvUncertainty in Avmagfloatf_Av[d] Indicates apertures for the Pa{alpha} & Br{gamma} spectral extractions differ by at least 50%charl_TrotLimit flag on TrotcharTrotH_2_ line rotational temperatureKinte_Trot? Uncertainty in TrotKintnullableTvib? H_2_ line vibrational temperature (1)Kintnullablee_Tvib? Uncertainty in TvibKintnullableMechH_2_ excitation Mechanism (2)char_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainJ/AJ/121/97/table6Relative Nuclear Radial VelocitiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.intNameGalaxy namecharVelRelative velocitykm/sinte_VelUncertainty in Velkm/sintf_VelFlag on Vel (1)charSepProjected separationkpcfloatJ/AJ/121/97/h2H_2_ Transitions (tables 7 and 8)recnoRecord number assigned by the VizieR team. Should Not be used for identification.intTransH_2_ transitioncharWaveWavelength in airumdoubleJ1The J1 rotation stateintProbTransition probability from Turner, Kirby-Docken, & Dalgarno 19771e-07s**-1floatE1/kEnergy divided by the Boltzmann constant from Dabrowski 1984KintS15H_2_ line strength relative to H_2_ 1-0 S(1) at T_rot_=1500 KfloatS20H_2_ line strength relative to H_2_ 1-0 S(1) at T_rot_=2000 KfloatS25H_2_ line strength relative to H_2_ 1-0 S(1) at T_rot_=2500 KfloatS40H_2_ line strength relative to H_2_ 1-0 S(1) at T_rot_=4000 Kfloat