J/A+A/644/A133ivo://CDS.VizieR/J/A+A/644/A133doi:10.26093/cds/vizier.36440133CDSHacar A.Hogerheijde M. R.Harsono D.Portegies Zwart S.De Breuck C.,Torstensson K.Boland W.Baryshev A.M.Hesper R.Barkhof J.Adema J.,Bekema M.E.Koops A.Khudchenko A.Stark R.2021-02-19T06:51:24Z2020-12-11T07:39:06ZCDS support team

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

cds-question@unistra.frinterstellar-mediumradio-spectroscopychemical-abundancesThe star-formation rates and stellar densities found in young massive clusters suggest that these stellar systems originate from gas at densities of n(H_2_)>10^6^cm^-3^. Until today, however, the physical characterization of this ultra high density material remains largely unconstrained in observations. We investigate the density properties of the star-forming gas in the OMC-1 region located in the vicinity of the Orion Nebula Cluster (ONC). Methods. We mapped the molecular emission at 652GHz in OMC-1 as part of the APEX-SEPIA660 Early Science. We detect bright and extended N_2_H^+^ (J=7-6) line emission along the entire OMC-1 region. Comparisons with previous ALMA data of the (J=1-0) transition and radiative transfer models indicate that the line intensities observed in this N_2_H^+^ (7-6) line are produced by large mass reservoirs of gas at densities n(H_2_)>10^7^cm^-3^. The first detection of this N_2_H^+^ (7-6) line at parsec-scales demonstrates the extreme density conditions of the star-forming gas in young massive clusters such as the ONC. Our results highlight the unique combination of sensitivity and mapping capabilities of the new SEPIA660 receiver for the study of the ISM properties at high frequencies.2020A&A...644A.133Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/644/A133CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/644/A133https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/644/A133http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/644/A133https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/644/A133https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/644/A133http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/644/A133GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/644/A133/list (List of fits files)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/644/A133/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/644/A133/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/644/A133/list?GETtext/xml+votable180.050000true83.80639-5.350420.0055555555555555566/21439https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/644/A133?format=asciiMillimeterdefaultJ/A+A/644/A133/listList of fits filessizeSize of FITS fileKibytephys.size;meta.fitsintrecnoRecord 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.numberintNz? Number of slices for the datacubesmeta.numberintnullablebVRAD? Lower value of VRAD interval for the datacubesm/sphys.veloc;pos.heliocentricdoublenullableBVRAD? Upper value of VRAD interval for the datacubesm/sphys.veloc;pos.heliocentricfloatnullabledVRAD? VRAD resolution for the datacubesm/sspect.resolutionfloatnullableFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fits