J/ApJS/271/3ivo://CDS.VizieR/J/ApJS/271/3doi:10.26093/cds/vizier.22710003CDSLiu X.Liu T.Shen Z.Qin S.-L.Luo Q.Gong Y.Cheng YuHenkel C.,Gu Q.Zhu F.Zhang T.Zhao R.Wu Y.Li B.Li J.Zhao Z.Wang J.,Zhong W.Liu Q.Xia BoFu LiYan Z.Zhang C.Wang L.Ye Q.,Yang A.Xu F.Zhang C.Dutta S.Li S.Liu M.Yang D.Li C.,Chen Li2024-11-06T20:31:13Z2024-05-17T16:23:17ZCDS support team

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

cds-question@unistra.frstar-forming-regionsradio-astronomymolecular-physicsradio-spectroscopyWe conducted a Ka-band (26.1-35GHz) line survey toward Orion KL using the TianMa 65m Radio Telescope (TMRT). It is the first blind line survey in the Ka band and achieves a sensitivity at the mK level (1-3mK at a spectral resolution of ~1km/s). In total, 592 Gaussian features are extracted. Among them, 257 radio recombination lines (RRLs) are identified. The maximum {Delta}n of RRLs of H, He, and C are 20, 15, and 5, respectively. Through stacking, we have detected the {beta} lines of ion RRLs (RRLs of C+ with the possible contribution of other ions like O+) for the first time, and a tentative signal of the {gamma} lines of ion RRLs can also be seen on the stacked spectrum. Besides this, 318 other line features were assigned to 37 molecular species, and 10 of these species were not detected in the Q-band survey of TMRT. The vibrationally excited states of nine species were also detected. The emission of most species can be modeled under LTE. A number of transitions of E-CH3OH (J_2_-J_1_) display maser effects, which are confirmed by our modeling, and besides the bumping peak at J~6, there is another peak at J~13. Methylcyanoacetylene (CH3C3N) is detected in Orion KL for the first time. This work emphasizes that the Ka band, which was long ignored for spectral line surveys, is very useful for surveying RRLs and molecular lines simultaneously.2024ApJS..271....3Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/271/3CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/ApJ/428/693 : Rosette Nebula & Maddalena Cloud structures (Williams+ 1994)J/A+A/327/1177 : Kinematics & electron temperatures in Orion A (Wilson+ 1997)J/ApJ/768/81 : Ethyl cyanide, CH3CH2CN, vibrational states (Daly+, 2013)J/A+A/564/A68 : Orion A GMC 13CO and C18O maps (Shimajiri+, 2014)J/MNRAS/452/3969 : ATCA Survey of Sagittarius B2 at 7mm (Corby+, 2015)J/A+A/581/A48 : 1.3cm line survey toward Orion KL (Gong+, 2015)J/A+A/604/A32 : Orion BN-KL ALMA view (Pagani+, 2017)J/A+A/605/A76 : Spectrum of Orion KL between 41.5 and 50GHz (Rizzo+, 2017)J/A+A/647/A42 : Detected CH_2_ spectra (Jacob+, 2021)J/ApJS/263/13 : 34.8-50GHz obs. toward Orion KL (Liu+, 2022)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/271/3https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/271/3http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/271/3https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/271/3https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/271/3http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/271/3GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapRadiodefaultJ/ApJS/271/3/table6Identification and Gaussian fitting of molecular linesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFreq[26120.5/34999.6]? Observed frequency (1)MHzem.freqdoublenullableSpeciesMolecular species (2)meta.id;phys.molRFreq[26120.5/34999.7]? Rest frequencyMHzem.freqdoublenullableTransition? Molecular transition J_Ka,Kc_ (3)phys.mol;phys.atmol.transitionEu[1.4/2090.5]? Upper-level energyKphys.energy;phys.atmol.levelfloatnullableAij[0.0006/4.5]? Einstein coefficient1e-06s**-1phys.atmol.transProbfloatnullableI[0.007/69.7]? Integrated intensity using main-beam temperatureK.km/sspect.line.intensityfloatnullablee_I[0.0002/0.1]? Uncertainty in IK.km/sstat.errorfloatnullableDV[0.9/76]? Line widthkm/sspect.line.widthfloatnullablee_DV[0.1/8]? Uncertainty in DVkm/sstat.errorfloatnullableTmb-pk[0.0012/14.1]? Peak main-beam temperatureKphys.temperature;obs.param;stat.maxdoublenullableVLSR[-23.6/33.5]? Local standard of rest velocitykm/sphys.veloc;pos.lsrfloatnullablee_VLSR[0.1/6]? Uncertainty in VLSRkm/sstat.error;phys.veloc;pos.lsrfloatnullableJ/ApJS/271/3/table7Identification and Gaussian fitting of radio recombination lines (RRLs)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFreq[26162.5/34955.6]? Observed frequency (1)MHzem.freqdoublenullablef_Freq[*] * = only marginally detectedmeta.codecharSpeciesRadio recombination line (2)meta.id;phys.molRFreq[26161.6/34954.4] Rest frequencyMHzem.freqdoubleI[0.009/61.4]? Integrated intensity using main-beam temperatureK.km/sspect.line.intensityfloatnullablee_I[0.001/0.2]? Uncertainty in IK.km/sstat.errorfloatnullableDV[2.2/45]? Line widthkm/sspect.line.widthfloatnullablee_DV[0.1/10]? Uncertainty in DVkm/sstat.errorfloatnullableTmb-pk[0.0016/2.4]? Peak main-beam temperatureKphys.temperature;obs.param;stat.maxdoublenullableVLSR[-16/21.2] Local standard of rest velocitykm/sphys.veloc;pos.lsrfloate_VLSR[0.1/4] Uncertainty in VLSRkm/sstat.error;phys.veloc;pos.lsrfloat