J/A+A/609/A16ivo://CDS.VizieR/J/A+A/609/A16doi:10.26093/cds/vizier.36090016CDSTang X.D.Henkel C.Menten K.M.Wyrowski F.Brinkmann N.Zheng X.W.,Gong Y.Lin Y.X.Esimbek J.Zhou J.J.Yuan Y.Li D.L.He Y.X.2018-01-11T13:29:23Z2017-12-22T19:33:23ZCDS support team

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

cds-question@unistra.frmolecular-cloudsradio-astronomyWe mapped the kinetic temperature structure of the Orion molecular cloud 1 (OMC-1) with para-H_2_CO(J_KaKc_=3_03_-2_02_, 3_22_-2_21_, and 3_21_-2_20_) using the APEX 12m telescope. This is compared with the temperatures derived from the ratio of the NH_3_ (2,2)/(1,1) inversion lines and the dust emission. Using the RADEX non-LTE model, we derive the gas kinetic temperature modeling the measured averaged line ratios of para-H_2_CO 3_22_-2_21_/3_03_-2_02_ and 3_21_-2_20_/3_03_-2_02_. The gas kinetic temperatures derived from the para-H_2_CO line ratios are warm, ranging from 30 to >200K with an average of 62+/-2K at a spatial density of 10^5^cm^-3^. These temperatures are higher than those obtained from NH_3_ (2,2)/(1,1) and CH_3_CCH(6-5) in the OMC-1 region. The gas kinetic temperatures derived from para-H_2_CO agree with those obtained from warm dust components measured in the mid infrared (MIR), which indicates that the para-H_2_CO(3-2) ratios trace dense and warm gas. The cold dust components measured in the far infrared (FIR) are consistent with those measured with NH_3_ (2,2)/(1,1) and the CH_3_CCH(6-5) line series. With dust at MIR wavelengths and para-H_2_CO(3-2) on one side and dust at FIR wavelengths, NH_3_ (2,2)/(1,1), and CH_3_CCH(6-5) on the other, dust and gas temperatures appear to be equivalent in the dense gas (n(H_2_)>~10^4^cm^-3^) of the OMC-1 region, but provide a bimodal distribution, one more directly related to star formation than the other. The non-thermal velocity dispersions of para-H2CO are positively correlated with the gas kinetic temperatures in regions of strong non-thermal motion (Mach number >~2.5) of the OMC-1, implying that the higher temperature traced by para-H2CO is related to turbulence on a ~0.06pc scale. Combining the temperature measurements with para-H_2_CO and NH3 (2,2)/(1,1) line ratios, we find direct evidence for the dense gas along the northern part of the OMC-1 10km/s filament heated by radiation from the central Orion nebula.2018A&A...609A..16Thttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/609/A16CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/598/A30 : Massive star forming molecular clumps Tkin (Tang+, 2017)J/A+A/600/A16 : Six LMC star forming region spectra (Tang+, 2017)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/609/A16https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/609/A16http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/609/A16https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/609/A16https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/609/A16http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/609/A16GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/609/A16/list (List of fits datacubes)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/609/A16/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/609/A16/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/609/A16/list?GETtext/xml+votable180.050000true83.80209-5.384010.0055555555555555566/21439https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/609/A16?format=asciiRadiodefaultJ/A+A/609/A16/listList of fits datacubesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right Ascension of center (J2000)degpos.eq.ra;meta.mainDEJ2000Declination of center (J2000)degpos.eq.dec;meta.mainNxNumber of pixels along X-axismeta.numberintNyNumber of pixels along Y-axismeta.numberintNzNumber of slicesmeta.numberintbVradLower value of radial velocity intervalm/sphys.veloc;pos.heliocentricdoubleBVradUpper value of radial velocity intervalm/sphys.veloc;pos.heliocentricfloatdVradRadial velocity resolutionm/sspect.resolutionfloatsizeSize of FITS fileKibytephys.size;meta.fitsintFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fits