J/A+A/583/A53ivo://CDS.VizieR/J/A+A/583/A53doi:10.26093/cds/vizier.35830053CDSLiseau R.Larsson B.2015-10-27T07:31:22Z2015-10-27T08:31:01ZCDS support team

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

cds-question@unistra.frmolecular-cloudsinterstellar-mediumyoung-stellar-objectsThe abundance of key molecules determines the level of cooling that is necessary for the formation of stars and planetary systems. In this context, one needs to understand the details of the time dependent oxygen chemistry, leading to the formation of molecular oxygen and water. We aim to determine the degree of correlation between the occurrence of O2 and HOOH (hydrogen peroxide) in star-forming molecular clouds. We first detected O2 and HOOH in the rho Ophiuchi cloud (core A), we now search for HOOH in Orion Molecular Cloud OMC A, where O2 has also been detected. We mapped a 3x3arcmin^2^ region around Orion H_2_-Peak 1 with the Atacama Pathfinder Experiment (APEX). In addition to several maps in two transitions of HOOH, viz. 219.17GHz and 251.91GHz, we obtained single-point spectra for another three transitions towards the position of maximum emission. Line emission at the appropriate LSR-velocity (Local Standard of Rest) and at the level of greater or equal to 4{sigma} was found for two transitions, with lower S/N (2.8-3.5{sigma}) for another two transitions, whereas for the remaining transition, only an upper limit was obtained. The emitting region, offset 18arcsec south of H_2_-Peak 1, appeared point-like in our observations with APEX. Conclusions: The extremely high spectral line density in Orion makes the identification of HOOH much more difficult than in rho Oph A. As a result of having to consider the possible contamination by other molecules, we left the current detection status undecided.2015A&A...583A..53Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/583/A53CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/583/A53https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/583/A53http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/583/A53https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/583/A53https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/583/A53http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/583/A53GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/583/A53/list (List of fits files)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/583/A53/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/583/A53/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/583/A53/list?GETtext/xml+votable180.050000true83.80708-5.369170.0055555555555555566/21439https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/583/A53?format=asciiOpticaldefaultJ/A+A/583/A53/listList of fits filesrecnoRecord 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.numberintNy? Number of pixels along Y-axismeta.numberintnullableNz? Number of slices for datacubesmeta.numberintnullableDateObservation date (YYYY-MM-DDThh:mm:ss.ss)time.epoch;obscharbFreqLower value of frequency intervalHzem.freq;stat.mindoubleBFreqUpper value of frequency intervalHzem.freq;stat.maxdoubledFreqFrequency resolutionHzspect.resolutionfloatsizeSize of FITS fileKibytephys.size;meta.fitsintFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fitschar