J/A+A/581/A71ivo://CDS.VizieR/J/A+A/581/A71doi:10.26093/cds/vizier.35810071CDSFeng S.Beuther H.Henning T.Semenov D.Palau A.Mills E.A.C.2017-12-06T07:37:47Z2015-09-04T07:09:11ZCDS support team

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

cds-question@unistra.frradio-continuum-emissionradio-astronomychemical-abundancesThe Kleinmann-Low nebula in Orion (Orion-KL) is the nearest example of a high-mass star-forming environment. For the first time, we complemented 1.3mm Submillimeter Array (SMA) interferometric line survey with IRAM 30m single-dish observations of the Orion-KL region. Covering a 4GHz bandwidth in total, this survey contains over 160 emission lines from 20 species (25 isotopologues), including 10 complex organic molecules (COMs). At a spatial resolution of 1200AU, the continuum substructures are resolved. Extracting the spectra from individual substructures and providing the intensity-integrated distribution map for each species, we studied the small-scale chemical variations in this region. Our main results are: (1) We identify lines from the low-abundance COMs CH3COCH3 and CH3CH2OH, as well as tentatively detect CH3CHO and long carbon-chains C6H and HC7N. (2) We find that while most COMs are segregated by type, peaking either towards the hot core (e.g., N-bearing species) or the compact ridge (e.g., O-bearing species like HCOOCH3, CH3OCH3, the distributions of others do not follow this segregated structure (e.g., CH3CH2OH, CH3OH, CH3COCH3). (3) We find a second velocity component of HNCO, 34SO2, and SO lines, which may be associated with a strong shock event in the low-velocity outflow. (4) Temperatures and molecular abundances show large gradients between central condensations and the outflow regions, illustrating a transition between hot molecular core and shock-chemistry dominated regimes. Our observations of spatially resolved chemical variations in Orion-KL provide the nearest reference source for hot molecular core and outflow chemistry, which will be an important example for interpreting the chemistry of more distant HMSFRs.2015A&A...581A..71Fhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/581/A71CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJS/156/127 : 350{mu}m molecular line survey of Orion KL (Comito+, 2005)J/A+A/532/A32 : HCOOCH3 map of Orion-KL (Favre+, 2011)J/A+A/559/A51 : HC_3_N in Orion KL (Esplugues+, 2013)J/ApJ/769/48 : Water maser in Orion-KL with Herschel (Neufeld+, 2013)J/ApJ/777/120 : cm to submm spectra of H_2_C^=^CH-CH_2_NC (Haykal+, 2013)J/A+A/568/A65 : NGC 7129 FIRS 2 interferometric 1-D spectrum (Fuente+, 2014)J/A+A/572/A44 : Vibrationally excited vinyl cyanide in Orion-KL (Lopez+, 2014)J/ApJ/779/119 : HCOOCH_2_D detection in Orion KL (Coudert+, 2013)J/ApJS/215/25 : Methyl formate (HCOOCH_3_) observations (Favre+, 2014)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/581/A71https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/581/A71http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/581/A71https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/581/A71https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/581/A71http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/581/A71GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/581/A71/list (List of fits files)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/581/A71/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/581/A71/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/581/A71/list?GETtext/xml+votable180.050000true83.81049-5.375180.0055555555555555566/21439https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/581/A71?format=asciiRadiodefaultJ/A+A/581/A71/listList of fits filesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right ascension of image center (J2000)degpos.eq.ra;meta.mainDEJ2000Declination of image center (J2000)degpos.eq.dec;meta.mainScale[0.4] Scale of the imagearcsec/pixinstr.scalefloatNx[256] Number of pixel along X-axismeta.id;meta.mainintNy[256] Number of pixel along Y-axismeta.idintNz[2300/2600]? Number of slices for data cubesmeta.numberintnullableDateObservation date (YYYY-MM-DDThh:mm:ss.s)stime.epoch;obsnullableV.minLower value of LSR velocity for datacubes or LSR velocity for imagekm/sphys.velocdoubleV.max? Upper value of LSR velocity for datacubeskm/sphys.velocfloatnullabledV[1.2]? Velocity resolution for datacubeskm/sspect.resolutionfloatnullablesizeSize of FITS fileKibytephys.size;meta.fitsintImSimbad column added by the CDSmeta.ref.urlcharfitsDownload the FITS filemeta.ref.urlcharFileNameName of the fits file in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the filemeta.title;meta.filechar