J/ApJ/817/167ivo://CDS.VizieR/J/ApJ/817/167doi:10.26093/cds/vizier.18170167CDSKirk H.Di Francesco J.Johnstone D.Duarte-Cabral A.Sadavoy S.,Hatchell J.Mottram J.C.Buckle J.Berry D.S.Broekhoven-Fiene H.,Currie M.J.Fich M.Jenness T.Nutter D.Pattle K.Pineda J.E.,Quinn C.Salji C.Tisi S.Hogerheijde M.R.Ward-Thompson D.,Bastien P.Bresnahan D.Butner H.Chen M.Chrysostomou A.Coude S.,Davis C.J.Drabek-Maunder E.Fiege J.Friberg P.Friesen R.,Fuller G.A.Graves S.Greaves J.Gregson J.Holland W.Joncas G.,Kirk J.M.Knee L.B.G.Mairs S.Marsh K.Matthews B.C.,Moriarty-Schieven G.Mowat C.Rawlings J.Richer J.Robertson D.,Rosolowsky E.Rumble D.Thomas H.Tothill N.Viti S.White G.J.,Wouterloot J.Yates J.Zhu M.2018-02-01T05:59:55Z2016-05-17T14:45:48ZCDS support team

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

cds-question@unistra.frmolecular-cloudsmillimeter-astronomysubmillimeter-astronomyyoung-stellar-objectssurveysWe present a first look at the SCUBA-2 observations of three sub-regions of the Orion B molecular cloud: LDN 1622, NGC 2023/2024, and NGC 2068/2071, from the JCMT Gould Belt Legacy Survey. We identify 29, 564, and 322 dense cores in L1622, NGC 2023/2024, and NGC 2068/2071 respectively, using the SCUBA-2 850{mu}m map, and present their basic properties, including their peak fluxes, total fluxes, and sizes, and an estimate of the corresponding 450{mu}m peak fluxes and total fluxes, using the FellWalker source extraction algorithm. Assuming a constant temperature of 20K, the starless dense cores have a mass function similar to that found in previous dense core analyses, with a Salpeter-like slope at the high-mass end. The majority of cores appear stable to gravitational collapse when considering only thermal pressure; indeed, most of the cores which have masses above the thermal Jeans mass are already associated with at least one protostar. At higher cloud column densities, above 1-2x10^23^/cm2, most of the mass is found within dense cores, while at lower cloud column densities, below 1x10^23^/cm2, this fraction drops to 10% or lower. Overall, the fraction of dense cores associated with a protostar is quite small (<8%), but becomes larger for the densest and most centrally concentrated cores. NGC 2023/2024 and NGC 2068/2071 appear to be on the path to forming a significant number of stars in the future, while L1622 has little additional mass in dense cores to form many new stars.2016ApJ...817..167Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/817/167CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/449/1769 : Orion A North prestellar core properties (Salji+, 2015)J/A+A/566/A45 : Orion optical-depth and column-density maps (Lombardi+, 2014)J/ApJ/790/49 : Gould's Belt VLA survey. III. Orion region (Kounkel+, 2014)J/ApJ/767/36 : APEX observations of HOPS protostars (Stutz+, 2013)J/A+A/538/A137 : Orion B9 dense cores maps (Miettinen+, 2012)J/AJ/144/192 : Spitzer survey of Orion A & B. I. YSO catalog (Megeath+, 2012)J/ApJ/710/1247 : Dense cores in Gould Belt clouds (Sadavoy+, 2010)J/ApJ/691/1560 : Dense core survey in the Orion B cloud (Ikeda+, 2009)J/ApJS/175/277 : Submillimeter-Continuum SCUBA detections (Di Francesco+, 2008)J/MNRAS/374/1413 : SCUBA survey of Orion (Nutter+, 2007)J/ApJ/668/1042 : Dense cores in Perseus molecular cloud (Kirk+, 2007)J/ApJ/639/259 : Sub-mm clumps in Orion B South mol. cloud (Johnstone+, 2006)J/A+A/440/151 : Observations at 850um in Perseus clusters (Hatchell+, 2005)J/ApJ/559/307 : Sub-mm mapping in Orion B molecular cloud (Johnstone+, 2001)J/A+A/372/L41 : NGC 2068/2071 protoclusters (Motte+, 2001)http://www.herschel.fr/cea/gouldbelt/en : Herschel Goud Belt survey home pagehttp://www3.cadc-ccda.hia-iha.nrc-cnrc.gc.ca/en/jcmt : JCMT Science Archivehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/817/167https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/817/167http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/817/167https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/817/167https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/817/167http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/817/167GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/817/167/table2 (*Dense cores identified with FellWalker)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/817/167/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/817/167/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/817/167/table2?GETtext/xml+votable180.050000true88.60251.73880560.0055555555555555566/22854 22855 22860 22861 22866 22873 22875 22876 22878 235602.232294361788794e-22 4.548340570656383e-22https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/817/167?format=asciiRadiodefaultJ/ApJ/817/167/table2*Dense cores identified with FellWalkerYSO[Y/N] YSO Flag (4)meta.codecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJLSGSource Name (JHHMMSS.s+DDMMSS)meta.id;meta.maincharRegionRegion surveyedmeta.notecharSeq[1/564] Source Index number in Regionmeta.idintRAJ2000[5] Hour of Right Ascension (J2000) (1)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000) (1)pos.eq.dec;meta.mainF850Pk[0.02/11.5] Peak 850{mu}m Flux (2)Jy/beamphot.flux.density;em.mm.200-400GHzfloatF850Tot[0.01/120] Total SCUBA-2 850{mu}m Flux (2)Jyphot.flux.density;em.mm.200-400GHzfloatReff[0.02/0.3] Effective Radius measured from 850{mu}m imagepcphys.size.radiusfloatF450Pk[0.1/45] Peak 450{mu}m Flux (3)Jy/beamphot.flux.density;em.mm.400-750GHzfloatF450Tot[-0.3/1117] Total SCUBA-2 450{mu}m Flux (3)Jyphot.flux.density;em.mm.400-750GHzdoubleCOCov[0.06/1]? Fraction of dense core footprint where CO observations existstat.fit.paramfloatnullableF850Pk2[0.03/11.4]? Peak 850{mu}m Flux corrected for CO emission, where availableJy/beamphot.flux.density;em.mm.200-400GHzfloatnullableF850Tot2[0.005/118]? Total 850{mu}m Flux corrected for CO emission, where availableJyphot.flux.density;em.mm.200-400GHzfloatnullableF850Tot3[-0.3/104] Total 850{mu}m Flux corrected for constant background emissionJyphot.flux.density;em.mm.200-400GHzfloatYSOCatDisplay Megeath+, 2012, J/AJ/144/192 and Stutz+, 2013, J/ApJ/767/36, data within 11"meta.ref.urlintnullableSimbadSimbad column added by the CDSmeta.ref.urlchar