J/A+A/617/A77ivo://CDS.VizieR/J/A+A/617/A77doi:10.26093/cds/vizier.36170077CDSParikka A.Habart E.Bernard-Salas J.Koehler M.Abergel A.2020-02-28T12:51:12Z2018-09-19T13:16:05ZCDS support team

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

cds-question@unistra.frmolecular-cloudsinterstellar-mediumco-line-emissionWith Herschel, we can for the first time observe a wealth of high-J CO lines in the interstellar medium with a high angular resolution. These lines are specifically useful for tracing the warm and dense gas and are therefore very appropriate for a study of strongly irradiated dense photodissocation regions (PDRs). We characterize the morphology of CO J=19-18 emission and study the high-J CO excitation in a highly UV-irradiated prototypical PDR, the Orion Bar. We used fully sampled maps of CO J=19-18 emission with the Photoconductor Array Camera and Spectrometer (PACS) on board the Herschel Space Observatory over an area of ~110"x110" with an angular resolution of 9". We studied the morphology of this high-J CO line in the Orion Bar and in the region in front and behind the Bar, and compared it with lower-J lines of CO from J=5-4 to J=13-12 and ^13^CO from J=5-4 to J=11-10 emission observed with the Herschel Spectral and Photometric Imaging Receiver (SPIRE). In addition, we compared the high-J CO to polycyclic aromatic hydrocarbon (PAH) emission and vibrationally excited H_2_. We used the CO and ^13^CO observations and the RADEX model to derive the physical conditions in the warm molecular gas layers.2018A&A...617A..77Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/617/A77CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/838/152 : Deep NIR spectrum of the Orion Bar PDR (Kaplan+, 2017)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/617/A77https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/617/A77http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/617/A77https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/617/A77https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/617/A77http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/617/A77GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/617/A77/list (List of fits maps)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/617/A77/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/617/A77/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/617/A77/list?GETtext/xml+votable180.050000true83.83803-5.413820.005555555555555556Associated datahttps://cdsarc.cds.unistra.fr/assocdata/?obs_collection=J/A+A/617/A776/21439https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/617/A77?format=asciiRadiodefaultJ/A+A/617/A77/listList of fits mapsrecnoRecord 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.numberintObs.dateObservation date (YYYY/MM/DDThh:mm:ss.sss)stime.epoch;obsnullablesizeSize of FITS fileKibytephys.size;meta.fitsintFileNameName of FITS file in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fits