J/ApJ/768/81ivo://CDS.VizieR/J/ApJ/768/81doi:10.26093/cds/vizier.17680081CDSDaly A.M.Bermudez C.Lopez A.Tercero B.Pearson J.C.Marcelino N.,Alonso J.L.Cernicharo J.2015-01-12T11:29:22Z2015-01-07T12:26:13ZCDS support team

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

cds-question@unistra.fratomic-physicsEthyl cyanide, CH_3_CH_2_CN, is an important interstellar molecule with a very dense rotational-vibrational spectrum. On the basis of new laboratory data in the range of 17-605GHz and ab initio calculations, two new vibrational states, {nu}_12_ and {nu}_20_, have been detected in molecular clouds of Orion. Laboratory data consist of Stark spectroscopy (17-110GHz) and frequency-modulated spectrometers (GEM laboratory in Valladolid: 17-170, 270-360GHz; Toyama: 26-200GHz; Emory: 200-240GHz; Ohio State: 258-368GHz; and JPL: 270-318, 395-605GHz). More than 700 distinct lines of each species were measured in J up to 71 and in K_a_ up to 25. The states were fitted with Watson's S-reduction Hamiltonian. The two new states have been identified in the interstellar medium toward the Orion Nebula (Orion KL). The ground state, the isotopologues of CH_3_CH_2_CN, and the vibrationally excited states have been fitted to obtain column densities and to derive vibrational temperatures. All together, ethyl cyanide is responsible for more than 2000 lines in the observed frequency range of 80-280GHz.2013ApJ...768...81Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/768/81CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+A/559/A51 : HC_3_N in Orion KL (Esplugues+, 2013)J/A+A/548/A71 : Spectroscopy and ISM detection of formamide (Motiyenko+, 2012)J/A+A/543/A135 : New analysis of ^13^C-CH_3_CH_2_CN up to 1THz (Richard+, 2012)J/A+A/538/A119 : ^18^O-methyl formate (HCO^18^OCH_3_) spectrum (Tercero+ 2012)J/A+A/532/A32 : HCOOCH3 map of Orion-KL (Favre+, 2011)J/ApJ/714/1120 : Rotational spectrum and DCOOCH_3_ in Orion (Margules+, 2010)J/ApJ/714/476 : Complete spectrum of ethyl cyanide (Fortman+, 2010)J/ApJS/184/133 : New ground-state measurements of ethyl cyanide (Brauer+, 2009)J/A+A/500/1109 : Rotational spectrum of HCOO^13^CH_3_ (Carvajal+, 2009)J/A+A/493/565 : Deuterated and ^15^N ethyl cyanides (Margules+, 2009)J/A+A/466/255 : Isotopic ethyl cyanide (Demyk+, 2007)J/ApJS/156/127 : 350{mu}m molecular line survey of Orion KL (Comito+, 2005)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/768/81https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/768/81http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/768/81https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/768/81https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/768/81http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/768/81GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/ApJ/768/81/table5Measured transitions of {nu}_20_ of ethyl cyaniderecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintJ'The J' level (1)meta.noteintK'aThe K'_a_ level (1)phys.mol.qnintK'cThe K'_c_ level (1)phys.mol.qnintJ"The J" level (1)phys.atmol.qnintK"aThe K"_a_ level (1)phys.mol.qnintK"cThe K"_c_ level (1)phys.mol.qnintnu[17393.3/604758] Observed frequency (1)Hzem.freqdoublee_nu[0.05/0.2] Error in nu (1)Hzstat.errorfloatf_nu[*] Indicates a non-fitted line (1)meta.codecharO-CDifference between observed and calculated frequencies (1)Hzstat.fit.residualfloatBlend[Yes ] Blended line? (1)meta.codecharfPeak[44804/601388]? Weighted average peak frequency (1)Hzem.freqdoublenullableJ/ApJ/768/81/table7Measured transitions of {nu}_12_ of ethyl cyanideJ'The J' level (1)meta.noteintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintK'aThe K'_a_ level (1)phys.mol.qnintK'cThe K'_c_ level (1)phys.mol.qnintJ"The J" level (1)phys.atmol.qnintK"aThe K"_a_ level (1)phys.mol.qnintK"cThe K"_c_ level (1)phys.mol.qnintnu[17393.3/604758] Observed frequency (1)Hzem.freqdoublee_nu[0.05/0.2] Error in nu (1)Hzstat.errorfloatf_nu[*] Indicates a non-fitted line (1)meta.codecharO-CDifference between observed and calculated frequencies (1)Hzstat.fit.residualfloatBlend[Yes ] Blended line? (1)meta.codecharfPeak[44804/601388]? Weighted average peak frequency (1)Hzem.freqdoublenullableJ/ApJ/768/81/table8Detected lines of CH_3_CH_2_CN {nu}_13_=1/{nu}_21_=1n_VLSRReference(s) on VLSR (see notes.dat)meta.notecharJThe J level (1)phys.atmol.qnintf_Eu[NW] Flag on Eu (G1)meta.codecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintKaThe K_a_ state (1)phys.mol.qnintKcThe K_c_ state (1)phys.mol.qnintnu[0/5] The {nu} state (1)phys.mol.qnintJ'The J' level (1)meta.noteintK'aThe K'_a_ state (1)phys.mol.qnintK'cThe K'_c_ state (1)phys.mol.qnintnu'[0/5] The {nu}' state (1)phys.mol.qnintnuP[80481.1/272019] Predicted laboratory frequencyMHzem.freqdoublef_nuP[*] Indicates line blended with previous rowmeta.codecharSij[0.9/40.3] Line strengthspect.line.intensityfloatEu[317.9/526] Upper level energyKphys.energy;phys.atmol.levelfloatVLSR[0.7/8] Local Standard of Rest radial velocity (G2)km/sspect.dopplerVeloc;pos.lsrfloate_VLSR[0.08/1.3]? Error in VLSR (G2)km/sstat.error;phys.veloc;pos.lsrfloatnullableWidth? Line width (G2)km/sspect.line.widthfloatnullablee_Width? Error in Width (G2)km/sstat.error;spect.line.widthfloatnullableTMB[0.08/4.3] Mean beam temperature T_MB_Kphys.temperature;stat.meanfloatArea? Line area (G2)K.km/sphot.fluxfloatnullablee_Area? Error in Area (G2)K.km/sstat.error;phys.areafloatnullableJ/ApJ/768/81/notesNotesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNoteCode of the notemeta.noteintTextText of the notemeta.noteJ/ApJ/768/81/table9Detected lines of CH_3_CH_2_CN {nu}_20_recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintJThe J level (1)phys.atmol.qnintKaThe K_a_ state (1)phys.mol.qnintKcThe K_c_ state (1)phys.mol.qnintJ'The J' level (1)meta.noteintKa'The K_a_' state (1)phys.mol.qnintKc'The K_c_' state (1)phys.mol.qnintnuP[80470.3/276969.5] Predicted laboratory frequencyMHzem.freqdoublef_nuP[*] Indicates line blended with previous rowmeta.codecharSij[3.5/32] Line strengthspect.line.intensityfloatEu[564.8/889.4] Upper level energyKphys.energy;phys.atmol.levelfloatf_Eu[NW] Flag on Eu (G1)meta.codecharVLSR[0.2/8] Local Standard of Rest radial velocity (G2)km/sspect.dopplerVeloc;pos.lsrfloate_VLSR[0.05/2]? Error in VLSR (G2)km/sstat.error;phys.veloc;pos.lsrfloatnullablen_VLSRReference(s) on VLSR (see notes.dat file)meta.notecharWidth? Line width (G2)km/sspect.line.widthfloatnullablee_Width? Error in Width (G2)km/sstat.error;spect.line.widthfloatnullableTMB[0.02/1.6] Mean beam temperatureKphys.temperature;stat.meanfloatArea? Line area (G2)K.km/sphot.fluxfloatnullablee_Area? Error in Area (G2)K.km/sstat.error;phys.areafloatnullableJ/ApJ/768/81/table10Detected lines of CH_3_CH_2_CN {nu}_12_f_nuP[*] Indicates line blended with previous rowmeta.codecharSij[1.8/30.7] Line strengthspect.line.intensityfloatKa'The K_a_' state (1)phys.mol.qnintKc'The K_c_' state (1)phys.mol.qnintKaThe K_a_ state (1)phys.mol.qnintKcThe K_c_ state (1)phys.mol.qnintJ'The J' level (1)meta.noteintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintJThe J level (1)phys.atmol.qnintnuP[80288/278417.3] Predicted laboratory frequencyMHzem.freqdoubleEu[799/1017.1] Upper level energyKphys.energy;phys.atmol.levelfloatnuO[80290.1/278422] Observed frequency {nu}_obs_MHzem.freqdoublen_nuOReference(s) on nuO (see notes.dat file)meta.notecharVLSR[0.5/9]? Local Standard of Rest radial velocitykm/sspect.dopplerVeloc;pos.lsrfloatnullableTMBo[0.01/0.5]? Observed mean beam temperatureKphys.temperature;stat.meanfloatnullableTMBm[0.01/0.4] Mean beam temperature from modelKphys.temperature;stat.meanfloat