J/ApJ/789/2ivo://CDS.VizieR/J/ApJ/789/2doi:10.26093/cds/vizier.17890002CDSRey M.Nikitin A.V.Tyuterev V.G.2017-05-05T11:08:09Z2017-03-13T12:36:24ZCDS support team

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

cds-question@unistra.fratomic-physicsspectroscopyinfrared-astronomyThe paper describes the construction of complete sets of hot methane lines based on accurate ab initio potential and dipole moment surfaces and extensive first-principle calculations. Four line lists spanning the [0-5000]/cm infrared region were built at T = 500, 1000, 1500, and 2000 K. For each of these four temperatures, we have constructed two versions of line lists: a version for high-resolution applications containing strong and medium lines and a full version appropriate for low-resolution opacity calculations. A comparison with available empirical databases is discussed in detail for both cold and hot bands giving a very good agreement for line positions, typically <0.1-0.5/cm and ~5% for intensities of strong lines. Together with numerical tests using various basis sets, this confirms the computational convergence of our results for the most important lines, which is the major issue for theoretical spectra predictions. We showed that transitions with lower state energies up to 14,000/cm could give significant contributions to the methane opacity and have to be systematically taken into account. Our list at 2000 K calculated up to J = 50 contains 11.5 billion transitions for I > 10^-29^ cm/mol. These new lists are expected to be quantitatively accurate with respect to the precision of available and currently planned observations of astrophysical objects with improved spectral resolution.2014ApJ...789....2Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/789/2CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/ApJ/757/46 : Hot methane (CH4) line list (Hargreaves+, 2012)J/ApJ/813/12 : Empirical methane (CH_4_) line list (Hargreaves+, 2015)J/MNRAS/440/1649 : ExoMol line lists for CH4 (Yurchenko+, 2014)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/789/2https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/789/2http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/789/2https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/789/2https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/789/2http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/789/2GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapInfrareddefaultJ/ApJ/789/2/table2Methane partition function calculated from variational rovibrational energy levelsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTempTemperatureKphys.temperaturefloatQPartition function from his workphys.atmoldoublef_QFlag on Q (1)meta.codecharHITRAN? HITRAn partition functionphys.atmoldoublenullablee_HITRAN? Percentage error between HITRAN and this work%stat.errorfloatnullableWenger? Wenger et al. (2008, JQSRT, 109, 2687) partition functionphys.atmoldoublenullablee_Wenger? Percentage error between Wenger and this work%stat.errorfloatnullableJ/ApJ/789/2/fig2Number of lines and convergence of the integrated intensity as a function of the intensity cutoff for different temperaturesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTempTemperatureKphys.temperatureintICutIntensity cutoff; 10^-n^cm/molphys.atmolintNumNumber of linesmeta.numberSumIntegrated intensitycm/molmeta.code;spect.line.intensitydouble