J/ApJ/743/131ivo://CDS.VizieR/J/ApJ/743/131doi:10.26093/cds/vizier.17430131CDSSmith R.G.Charnley S.B.Pendleton Y.J.Wright C.M.Maldoni M.M.,Robinson G.2017-07-04T07:09:04Z2013-06-18T07:09:51ZCDS support team

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

cds-question@unistra.frchemical-abundancesinterstellar-mediuminfrared-astronomyspectroscopyRecent surface chemistry experiments have shown that the hydrogenation of molecular oxygen on interstellar dust grains is a plausible formation mechanism, via hydrogen peroxide (H_2_O_2_), for the production of water (H_2_O) ice mantles in the dense interstellar medium. Theoretical chemistry models also predict the formation of a significant abundance of H_2_O_2_ ice in grain mantles by this route. At their upper limits, the predicted and experimental abundances are sufficiently high that H_2_O_2_ should be detectable in molecular cloud ice spectra. To investigate this further, laboratory spectra have been obtained for H_2_O_2_/H_2_O ice films between 2.5 and 200um, from 10 to 180K, containing 3%, 30%, and 97% H_2_O_2_ ice. Integrated absorbances for all the absorption features in low-temperature H_2_O_2_ ice have been derived from these spectra. For identifying H_2_O_2_ ice, the key results are the presence of unique features near 3.5, 7.0, and 11.3um. Comparing the laboratory spectra with the spectra of a group of 24 protostars and field stars, all of which have strong H_2_O ice absorption bands, no absorption features are found that can definitely be identified with H_2_O_2_ ice. In the absence of definite H_2_O_2_ features, the H_2_O_2_ abundance is constrained by its possible contribution to the weak absorption feature near 3.47um found on the long-wavelength wing of the 3um H_2_O ice band. This gives an average upper limit for H_2_O_2_, as a percentage of H_2_O, of 9%+/-4%. This is a strong constraint on parameters for surface chemistry experiments and dense cloud chemistry models.2011ApJ...743..131Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/743/131CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/701/1347 : Optical constants of H_2_O-ice (Mastrapa+, 2009)J/ApJ/678/985 : c2d Spitzer survey of interstellar ices. I. (Boogert+, 2008)J/ApJ/684/1240 : Prestellar cores in Perseus, Serpens & Oph (Enoch+, 2008)J/ApJS/86/713 : IR spectroscopy of ices (Hudgins+, 1993)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/743/131https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/743/131http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/743/131https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/743/131https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/743/131http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/743/131GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/743/131/table10 (Upper limits to the H_2_O_2_ ice abundances, relative to H_2_O ice, for a selection of protostars and field stars based on the optical depth at 3.50um within the 3.47um feature)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/743/131/table10?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/743/131/table10?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/743/131/table10?GETtext/xml+votable180.050000true36.418916762.09761110.0055555555555555566/1054 3649 14317 14689 15667 21439 21458 22243 23549 23969 29504 30366 30694 30733 42981 47828https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/743/131?format=asciiInfrareddefaultJ/ApJ/743/131/table5Absorbance data for the 3% far-infrared 20-200um (500-50cm^-1^) H_2_O_2_/H_2_O ice filmsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintsigmaWavenumbercm**-1em.wavenumberdoubleAbs10Absorbance at 10Kphys.absorptiondoubleAbs30Absorbance at 30Kphys.absorptiondoubleAbs50Absorbance at 50Kphys.absorptiondoubleAbs70Absorbance at 70Kphys.absorptiondoubleAbs90Absorbance at 90Kphys.absorptiondoubleAbs110Absorbance at 110Kphys.absorptiondoubleAbs120Absorbance at 120Kphys.absorptiondoubleAbs130Absorbance at 130Kphys.absorptiondoubleAbs140Absorbance at 140Kphys.absorptiondoubleAbs150Absorbance at 150Kphys.absorptiondoubleJ/ApJ/743/131/table6Absorbance data for the 30% far-infrared 20-200um (500-50cm^-1^) H_2_O_2_/H_2_O ice filmsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintsigmaWavenumbercm**-1em.wavenumberdoubleAbs10Absorbance at 10Kphys.absorptiondoubleAbs30Absorbance at 30Kphys.absorptiondoubleAbs50Absorbance at 50Kphys.absorptiondoubleAbs70Absorbance at 70Kphys.absorptiondoubleAbs90Absorbance at 90Kphys.absorptiondoubleAbs110Absorbance at 110Kphys.absorptiondoubleAbs120Absorbance at 120Kphys.absorptiondoubleAbs130Absorbance at 130Kphys.absorptiondoubleAbs140Absorbance at 140Kphys.absorptiondoubleAbs150Absorbance at 150Kphys.absorptiondoubleJ/ApJ/743/131/table7Absorbance data for the 97% far-infrared 20-200um (500-50cm^-1^) H_2_O_2_/H_2_O ice filmsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintsigmaWavenumbercm**-1em.wavenumberdoubleAbs10Absorbance at 10Kphys.absorptiondoubleAbs30Absorbance at 30Kphys.absorptiondoubleAbs50Absorbance at 50Kphys.absorptiondoubleAbs70Absorbance at 70Kphys.absorptiondoubleAbs90Absorbance at 90Kphys.absorptiondoubleAbs110Absorbance at 110Kphys.absorptiondoubleAbs120Absorbance at 120Kphys.absorptiondoubleAbs130Absorbance at 130Kphys.absorptiondoubleAbs140Absorbance at 140Kphys.absorptiondoubleAbs150Absorbance at 150Kphys.absorptiondoubleAbs160? Absorbance at 160K (for tables 3, 4 and 7)phys.absorptiondoublenullableAbs170? Absorbance at 170 K (only for tables 4 and 7)phys.absorptiondoublenullableJ/ApJ/743/131/table10Upper limits to the H_2_O_2_ ice abundances, relative to H_2_O ice, for a selection of protostars and field stars based on the optical depth at 3.50um within the 3.47um featureSimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGroup"Processed" or "Unprocessed" (1)meta.notecharNameSource namemeta.id;meta.mainchartau3.08Optical depth {tau} at 3.08umphys.absorption.opticalDepthfloattau3.50Optical depth {tau} at 3.50umphys.absorption.opticalDepthfloatH2O2H_2_O_2_ ice abundance relative to H_2_O ice%phys.abund;arith.ratiointRefReference(s) (2)meta.ref;pos.framechar_RAPositions from SIMBAD database (right ascension part)degpos.eq.ra;meta.main_DEPositions from SIMBAD database (declination part)degpos.eq.dec;meta.mainJ/ApJ/743/131/table2Absorbance data for the 3% near-infrared 2.5-25um (4000-400cm^-1^) H_2_O_2_/H_2_O ice filmsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintsigmaWavenumbercm**-1em.wavenumberdoubleAbs10Absorbance at 10Kphys.absorptiondoubleAbs30Absorbance at 30Kphys.absorptiondoubleAbs50Absorbance at 50Kphys.absorptiondoubleAbs70Absorbance at 70Kphys.absorptiondoubleAbs90Absorbance at 90Kphys.absorptiondoubleAbs110Absorbance at 110Kphys.absorptiondoubleAbs120Absorbance at 120Kphys.absorptiondoubleAbs130Absorbance at 130Kphys.absorptiondoubleAbs140Absorbance at 140Kphys.absorptiondoubleAbs150Absorbance at 150Kphys.absorptiondoubleJ/ApJ/743/131/table3Absorbance data for the 30% near-infrared 2.5-25um (4000-400cm^-1^) H_2_O_2_/H_2_O ice filmsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintsigmaWavenumbercm**-1em.wavenumberdoubleAbs10Absorbance at 10Kphys.absorptiondoubleAbs30Absorbance at 30Kphys.absorptiondoubleAbs50Absorbance at 50Kphys.absorptiondoubleAbs70Absorbance at 70Kphys.absorptiondoubleAbs90Absorbance at 90Kphys.absorptiondoubleAbs110Absorbance at 110Kphys.absorptiondoubleAbs120Absorbance at 120Kphys.absorptiondoubleAbs130Absorbance at 130Kphys.absorptiondoubleAbs140Absorbance at 140Kphys.absorptiondoubleAbs150Absorbance at 150Kphys.absorptiondoubleAbs160? Absorbance at 160K (for tables 3, 4 and 7)phys.absorptiondoublenullableJ/ApJ/743/131/table4Absorbance data for the 97% near-infrared 2.5-25um (4000-400cm^-1^) H_2_O_2_/H_2_O ice filmssigmaWavenumbercm**-1em.wavenumberdoubleAbs140Absorbance at 140Kphys.absorptiondoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintAbs10Absorbance at 10Kphys.absorptiondoubleAbs30Absorbance at 30Kphys.absorptiondoubleAbs50Absorbance at 50Kphys.absorptiondoubleAbs70Absorbance at 70Kphys.absorptiondoubleAbs90Absorbance at 90Kphys.absorptiondoubleAbs110Absorbance at 110Kphys.absorptiondoubleAbs120Absorbance at 120Kphys.absorptiondoubleAbs130Absorbance at 130Kphys.absorptiondoubleAbs150Absorbance at 150Kphys.absorptiondoubleAbs160? Absorbance at 160K (for tables 3, 4 and 7)phys.absorptiondoublenullableAbs170? Absorbance at 170 K (only for tables 4 and 7)phys.absorptiondoublenullableAbs180? Absorbance at 180 K (only for table 4)phys.absorptiondoublenullable