J/ApJS/224/7ivo://CDS.VizieR/J/ApJS/224/7doi:10.26093/cds/vizier.22240007CDSDu X.Xu Y.Yang J.Sun Y.Li F.Zhang S.Zhou X.2020-01-28T15:36:35Z2016-07-22T13:05:02ZCDS support team

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

cds-question@unistra.frmilky-way-galaxymolecular-cloudsinterstellar-mediumradio-astronomyThe lack of arm tracers, especially remote tracers, is one of the most difficult problems preventing us from studying the structure of the Milky Way. Fortunately, with its high-sensitivity CO survey, the Milky Way Imaging Scroll Painting (MWISP) project offers such an opportunity. Since completing about one-third of its mission, an area of l=[100,150]{deg}, b=[-3,5]{deg} has nearly been covered. The Outer arm of the Milky Way first clearly revealed its shape in the second galactic quadrant in the form of molecular gas --this is the first time that the Outer arm has been reported in such a large-scale mapping of molecular gas. Using the 115GHz ^12^CO(1-0) data of MWISP at the LSR velocity ~[-100,-60]km/s and in the area mentioned above, we have detected 481 molecular clouds in total, and among them 332 (about 69%) are newly detected and 457 probably belong to the Outer arm. The total mass of the detected Outer arm clouds is ~3.1x10^6^M_{sun}__. Assuming that the spiral arm is a logarithmic spiral, the pitch angle is fitted as ~13.1{deg}. Besides combining both the CO data from MWISP and the 21cm HI data from the Canadian Galactic Plane Survey (CGPS), the gas distribution, warp, and thickness of the Outer arm are also studied.2016ApJS..224....7Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/224/7CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVI/128 : Log of CGPS exposures (Taylor+, 2003-)VIII/39 : Composite CO Survey of the Milky Way (Dame+ 1987)J/ApJ/798/L27 : CO obs. of molecular clouds in the 2nd quadrant (Sun+, 2015)J/A+A/569/A125 : Spiral structure of the Milky Way (Hou+, 2014)J/ApJ/783/130 : Parallaxes of high mass star forming regions (Reid+, 2014)J/A+A/470/161 : UBV photometry of HII regions exciting stars (Russeil+, 2007)J/ApJS/144/47 : Outer galaxy molecular cloud catalog (Brunt+, 2003)J/A+A/397/133 : Star-forming complexes in the Galaxy (Russeil+, 2003)J/ApJ/551/852 : FCRAO CO survey of the outer Galaxy (Heyer+, 2001)J/ApJS/100/125 : CO(J=2-1) Survey of the Milky Way (Sakamoto+, 1995)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/224/7https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/224/7http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/224/7https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/224/7https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/224/7http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/224/7GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/224/7/table1 (Parameters of molecular clouds derived by CO(1-0))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/224/7/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/224/7/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/224/7/table1?GETtext/xml+votable180.050000true327.5000459.030460.0055555555555555565/827 909 911 914 3911 3917 6/1789 1790 1791 1962 1963 3063 3065 3066 3067 3068 3069 3070 3157 3158 3159 3163 3164 3166 3167 3185 3186 3187 3188 3190 3193 3196 3199 3269 3277 3279 3280 3281 3284 3285 3288 3290 3291 3301 3303 3305 3307 3314 3320 3322 3328 3329 3330 3338 3360 3362 3613 3615 3641 3643 3648 3649 3651 3652 3654 3660 3680 3688 3717 3718 3719 3724 3725 3726 3729 3730 3732 3733 3734 3736 3744 3745 14329 14331 14332 14333 14335 15627 15628 15630 15631 15639 15641 15642 15649 15650 15651 15652 15653 15655 15664 15665 15666 15681 15682 15683 15684 15685 15687 15688 15693 15698 15699 15700 15701 15702 15705 15712 15714https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/224/7?format=asciiRadiodefaultJ/ApJS/224/7/table1Parameters of molecular clouds derived by CO(1-0)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMWISPMWISP project source identifier (1)meta.id;meta.maincharVLSR[-97/-47] Local Standard of Rest velocity (2)km/sphys.veloc;pos.lsrfloatTpeak[1/16.5] Peak temperature (2)Kphys.temperaturefloatDeltaV[0.4/5] Line width (2)km/sspect.line.widthfloatICO[1/51] CO line intensity (2)K.km/sphot.flux.density;em.line.COfloatArea[1.9/616.5] Solid angle defined by the 3{sigma} limitarcmin**2phys.angSizefloatDist[4.7/9] Heliocentric distance (3)kpcpos.distancefloatRad[12/16.7] Galactocentric radius (3)kpcphys.size.radius;pos.galactocentricfloatSize[2/63.5] Equivalent cloud diameter (4)pcphys.size.diameterfloatMass[0.1/620] Mass Cloud mass (5)1000solMassphys.massfloatZ[-0.1/0.7] Galactic scale height (Dist*sin(b))kpcinstr.scale;pos.galacticfloatNoteAdditional notes or identifiers (6)meta.notecharSimbadSimbad column added by the CDSmeta.ref.urlchar_GlonPositions from MWISP names (longitude part)degpos.galactic.lon_GlatPositions from MWISP names (latitude part)degpos.galactic.lat_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.decnullableindexed