J/A+A/588/A30ivo://CDS.VizieR/J/A+A/588/A30doi:10.26093/cds/vizier.35880030CDSSadavoy S.I.Stutz A.Schnee S.Mason B.Di Francesco J.Friesen R.2022-11-21T08:01:36Z2016-03-14T08:11:32ZCDS support team

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

cds-question@unistra.frinterstellar-mediummillimeter-astronomysubmillimeter-astronomyinfrared-sourcesWe present new measurements of the dust emissivity index, {beta}, for the high-mass, star-forming OMC 2/3 filament. We combined 160-500um data from Herschel with long-wavelength observations at 2mm and fit the spectral energy distributions across a=~2pc long, continuous section of OMC 2/3 at 15000AU (0.08pc) resolution. With these data, we measured {beta} and reconstructed simultaneously the filtered-out large-scale emission at 2mm. We implemented both variable and fixed values of {beta}, finding that {beta}=1.7-1.8 provides the best fit across most of OMC 2/3. These {beta} values are consistent with a similar analysis carried out with filtered Herschel data. Thus, we show that {beta} values derived from spatial filtered emission maps agree well with those values from unfiltered data at the same resolution. Our results contradict the very low {beta} values (~0.9) previously measured in OMC 2/3 between 1.2mm and 3.3mm data, which we attribute to elevated fluxes in the 3.3mm observations. Therefore, we find no evidence of rapid, extensive dust grain growth in OMC 2/3. Future studies with Herschel data and complementary ground-based long-wavelength data can apply our technique to obtain reliable determinations of {beta} in nearby cold molecular clouds.2016A&A...588A..30Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/588/A30CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/588/A30https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/588/A30http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/588/A30https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/588/A30https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/588/A30http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/588/A30GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/588/A30/table1 (Source properties (updated table, 21/11/2022, from corrigendum 2022A&A...666C...2S))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/588/A30/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/588/A30/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/588/A30/table1?GETtext/xml+votable180.050000true83.875-4.980.005555555555555556Cone search capability for table J/A+A/588/A30/list (Information on fits file)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/588/A30/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/588/A30/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/588/A30/list?GETtext/xml+votable180.050000true83.83583-5.187780.005555555555555556Associated datahttps://cdsarc.cds.unistra.fr/assocdata/?obs_collection=J/A+A/588/A306/21439 22805https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/588/A30?format=asciiInfraredMillimeterdefaultJ/A+A/588/A30/table1Source properties (updated table, 21/11/2022, from corrigendum 2022A&A...666C...2S)SimbadNameSimbad column added by the CDSmeta.idcharnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDSource Name (1)meta.id;meta.maincharHOPS? HOPS ID number (2)meta.idintnullableHflag[t] Flag for HOPS ID number (3)meta.codecharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainTdDust temperatureKphys.temperaturefloate_TdError on dust temperatureKstat.errorfloatb1Dust emissivity index (beta)stat.fit.paramfloate_b1Error on dust emissivity indexstat.errorfloatM1MasssolMassphys.massfloate_M1Error on masssolMassstat.errorfloatTk? Kinetic gas temperature (4)Kphys.temperatureintnullableb2? Dust emissivity index (beta) (4)stat.fit.paramfloatnullablee_b2? Error on dust emissivity index (4)stat.errorfloatnullableM2? Mass (4)solMassphys.massfloatnullablee_M2? Error on mass (4)solMassstat.errorfloatnullableJ/A+A/588/A30/listInformation on fits filerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000? Right Ascension of center (J2000)degpos.eq.ra;meta.mainnullableDEJ2000? Declination of center (J2000)degpos.eq.dec;meta.mainnullableNx? Number of pixels along X-axismeta.numberintnullableNy? Number of pixels along Y-axismeta.numberintnullablesizeSize of FITS fileKibytephys.size;meta.fitsintFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharExtTitle of the extentionmeta.notechar