J/ApJS/95/457ivo://CDS.VizieR/J/ApJS/95/457doi:10.26093/cds/vizier.20950457CDSWood D.O.S.Myers P.C.Daugherty D.A.2017-06-12T08:25:01Z1999-12-23T10:47:44ZCDS support team

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

cds-question@unistra.frinfrared-sourcesinterstellar-mediumWe have investigated ~100 nearby molecular clouds using the extensive, all-sky database of IRAS. The clouds in this study cover a wide range of physical properties including visual extinction, size, mass, degree of isolation, homogeneity and morphology. IRAS 100 and 60 micrometre co-added images were used to calculate the 100 micrometre optical depth of dust in the clouds. These images of dust optical depth compare very well with ^12^CO and ^13^CO observations, and can be related to H_2_ column density. From the optical depth images we locate the edges of dark clouds and the dense cores inside them. We have identified a total of 43 "IRAS clouds" (regions with Av>2) which contain a total of 255 "IRAS cores" (regions with Av>4) and we catalog their physical properties. We find that the clouds are remarkably filamentary, and that the cores within the clouds are often distributed along the filaments. The largest cores are usually connected to other large cores by filaments. We have developed selection criteria to search the IRAS Point Source Catalog for stars that are likely to be associated with the clouds and we catalog the IRAS sources in each cloud or core. Optically visible stars associated with the clouds have been identified from the Herbig and Bell catalog. From these data we characterize the physical properties of the clouds including their star-formation efficiency.1994ApJS...95..457Whttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/95/457CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/125 : IRAS catalogue of Point Sources, Version 2.0 (IPAC 1986)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/95/457https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/95/457http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/95/457https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/95/457https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/95/457http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/95/457GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/95/457/fields (Fields studied, flat-fielding and background subtraction)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/95/457/fields?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/95/457/fields?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/95/457/fields?GETtext/xml+votable180.050000true11.460552.60650.005555555555555556Cone search capability for table J/ApJS/95/457/table4 (IRAS clouds (Av > 2 mag))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/95/457/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/95/457/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/95/457/table4?GETtext/xml+votable180.050000true11.59275951.6893860.005555555555555556Cone search capability for table J/ApJS/95/457/table5 (IRAS cores (Av > 4 mag))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/95/457/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/95/457/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/95/457/table5?GETtext/xml+votable180.050000true7.92251455.4781240.0055555555555555565/270 5712 6/255 469 597 599 768 770 835 842 846 856 858 860 861 862 881 1031 1039 1045 1047 1048 1050 1052 1059 1060 1061 1065 1068 1072 1073 1075 1076 1078 1085 1087 1154 1159 1164 1166 1168 1170 1177 1194 1258 1531 1539 1544 1546 1557 2951 2962 2966 2971 2972 3878 3884 3887 3896 3898 3973 3975 3984 8150 8159 12270 20985 21325 21329 21336 21337 21340 21486 21488 22191 22853 22854 22855 22856 22861 22863 22864 22866 22867 22872 22873 22876 22877 22884 22989 22999 23005 23007 23029 23031 23557 23562 23563 23576 23578 23584 23585 23588 23590 23591 23595 23598 23599 23600 23611 23680 23684 23690 23691 23697 23699 23712 23714 23720 23721 23723 23726 23727 23731 23737 23738 23739 23740 23742 23749 23762 24066 24067 24068 24069 24073 24076 24077 24080 24081 24084 24086 24099 24105 24112 29354 29355 31241 42867 42947 42950 42953 42971 42982 42993 42995 43001 44371 44373https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/95/457?format=asciiInfrareddefaultJ/ApJS/95/457/fieldsFields studied, flat-fielding and background subtractionrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameField namemeta.id;obs.fieldcharRA1950Center right ascension (1950)pos.eq.ra;meta.mainDE1950Center declination (1950)pos.eq.dec;meta.mainGLONGalactic longitudedegpos.galactic.lonGLATGalactic latitudedegpos.galactic.latfloatDim1Dimensiondegphys.sizefloatDim2Dimensiondegphys.sizefloatoRA(1)? Point 1 R.A. offset (1)arcminpos.eq.ra;arith.diffintnullableoDE(1)? Point 1 Dec. offset (1)arcminpos.eq.dec;arith.diffintnullableS100(1)? Point 1 100{mu}m flux (1)MJy/srphot.flux.density;em.IR.60-100umfloatnullableS60(1)? Point 1 60{mu}m flux (1)MJy/srphot.flux.density;em.IR.30-60umfloatnullableoRA(2)? Point 2 R.A. offset (1)arcminpos.eq.ra;arith.diffintnullableoDE(2)? Point 2 Dec. offset (1)arcminpos.eq.dec;arith.diffintnullableS100(2)? Point 2 100{mu}m flux (1)MJy/srphot.flux.density;em.IR.60-100umfloatnullableS60(2)? Point 2 60{mu}m flux (1)MJy/srphot.flux.density;em.IR.30-60umfloatnullableoRA(3)? Point 3 R.A. offset (1)arcminpos.eq.ra;arith.diffintnullableoDE(3)? Point 3 Dec. offset (1)arcminpos.eq.dec;arith.diffintnullableS100(3)? Point 3 100{mu}m flux (1)MJy/srphot.flux.density;em.IR.60-100umfloatnullableS60(3)? Point 3 60{mu}m flux (1)MJy/srphot.flux.density;em.IR.30-60umfloatnullableoRA(b)Background subtraction R.A. offsetarcminpos.eq.ra;arith.diffintoDE(b)Background subtraction Dec. offsetarcminpos.eq.dec;arith.diffintS100(b)Background subtraction 100{mu}m fluxMJy/srphot.flux.density;em.IR.60-100umfloatS60(b)Background subtraction 60{mu}m fluxMJy/srphot.flux.density;em.IR.30-60umfloat_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data)pos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data)pos.eq.decnullableindexedJ/ApJS/95/457/table4IRAS clouds (Av > 2 mag)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCloudCloud name (1)meta.id;meta.maincharprimaryNcNumber of associated coresmeta.numberintnullableDistAssumed distance to the cloudpcpos.distance;pos.heliocentricintRA1Bottom left field right ascension (1950)pos.eq.ra;meta.mainDE1Bottom left field declination (1950)pos.eq.dec;meta.mainRA2Top right field right ascension (1950)pos.eq.ra;obs.fieldDE2Top right field declination (1950)pos.eq.dec;obs.fieldAreaTotal area of the cloudpc**2phys.areafloattau100Mean 100{mu}m optical depth {tau}phys.absorption.opticalDepth;stat.meanintl_MH2Limit flag on MH2meta.code.errorcharMH2H_2_ total masssolMassphys.massintNoteNotes (G1)meta.notechar_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data)pos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data)pos.eq.decnullableindexedJ/ApJS/95/457/table5IRAS cores (Av > 4 mag)l_M*Limit flag on M*meta.code.errorcharNoteNotes (G1)meta.notecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCloudCloud name (1)meta.id;meta.maincharm_CloudCore name (1)meta.code.multipintRAPPeak 100um optical depth right ascension (1950)pos.eq.raDEPPeak 100um optical depth declination (1950)pos.eq.dectauPMaximal optical depth in the core (in {mu}neper)phys.absorption.opticalDepthintTPDust temperature at the position of tauPKphys.temperatureintRA1950Ellipse right ascension (1950) (2)pos.eq.ra;meta.mainDE1950Ellipse declination (1950) (2)pos.eq.dec;meta.mainMajAxisEllipse major axis (2)pcphys.size;pos.errorEllipsefloatMinAxisEllipse minor axis (2)pcphys.size;pos.errorEllipsefloatPAEllipse position angle (deg E of N) (2)degpos.posAng;pos.errorEllipseintAreaCore areapc**2phys.areadoublel_McoreLimit flag on Mcoremeta.code.errorcharMcoreTotal mass of the coresolMassphys.massdoubleNMean core column density1e+21cm**-2phys.columnDensity;stat.meanfloatHDNumber of associated stars from HD cataloguemeta.numberintIRASNumer of IRAS PSC associationsmeta.id.associntM*Total mass of all IRAS stars associated with the coresolMassphys.massfloatl_L*Limit flag on L*meta.code.errorcharL*Total luminosity of all IRAS stars associated with the coresolLumphys.luminositydouble_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data)pos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data)pos.eq.decnullableindexed