J/ApJ/828/59ivo://CDS.VizieR/J/ApJ/828/59doi:10.26093/cds/vizier.18280059CDSSu Y.Sun Y.Li C.Zhang S.Zhou X.Fang M.Yang J.Chen X.2017-03-01T13:09:14Z2017-01-16T12:58:09ZCDS support team

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

cds-question@unistra.frmolecular-cloudsmilky-way-galaxyradio-astronomysurveysThe Galactic plane has been mapped from l=34.75{deg} to 45.25{deg} and b=-5.25{deg} to 5.25{deg} in the CO (J=1-0) emission with the 13.7m telescope of the Purple Mountain Observatory. The unbiased survey covers a large area of 110 square degrees sampled every 30" with a velocity resolution of ~0.2km/s. In this paper, we present the result of an unbiased CO survey of this longitude and latitude range in the velocity range from -60 to -10km/s. Over 500 molecular clouds (MCs) are picked out from the ^12^CO (J=1-0) emission, and 131 of these MCs are associated with ^13^CO emission. The distant MCs, which lie beyond the solar circle and are mostly concentrated in the Galactic plane, trace the large-scale molecular gas structure over 10 degrees of Galactic azimuth. We find that the distribution of the distant MCs can be well fitted by a Gaussian function with a full width at half maximum (FWHM) of 0.7{deg} with the Galactic latitude. We suggest that the CO emission of the segment is from the Outer Arm. The physical mid-plane traced by the Outer Arm seems to be slightly displaced from the IAU-defined plane on a large scale, which could be explained by the warped plane at large Galactocentric distances of >~10kpc and the apparent tilted mid-plane to the projected IAU-defined plane caused by the Sun's z-height above the disk for distances near and within the Solar circle. After removing the effect of the warp and tilted structure, the scale height of the MCs in the Outer Arm is about 0.6{deg} or 160pc at a heliocentric distance of 15kpc. If the inner plane of our Galaxy is flat, we can derive an upper limit of the Sun's offset of ~17.1pc above the physical mid-plane of the Milky Way. We also discuss the correlations between the physical parameters of the distant MCs, which is quite consistent with the result of other studies of this parameter.2016ApJ...828...59Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/828/59CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVIII/40 : GB6 catalog of radio sources (Gregory+ 1996)VIII/58 : A Survey of Radio H II Regions in the Northern Sky (Lockman+ 1989)VIII/39 : Composite CO Survey of the Milky Way (Dame+ 1987)J/ApJS/224/7 : CO obs. of the outer arm in the 2nd quadrant (Du+, 2016)J/ApJS/221/26 : Radio obs. of Galactic WISE HII regions (Anderson+, 2015)J/ApJ/798/L27 : CO obs. of molecular clouds in the 2nd quadrant (Sun+, 2015)J/ApJ/783/130 : Parallaxes of high mass star forming regions (Reid+, 2014)J/AJ/147/46 : Properties of clumps in the NAN complex (Zhang+, 2014)J/ApJ/738/27 : Galactic HII regions RRL and continuum data (Balser+, 2011)J/ApJS/194/32 : The HII Region Discovery Survey (HRDS). II. (Anderson+, 2011)J/ApJ/723/492 : Properties of GRS molecular clouds (Roman-Duval+, 2010)J/ApJ/699/1092 : Giant molecular clouds (SRBY) (Heyer+, 2009)J/A+A/382/513 : Galaxy warps in the HDF North and South (Reshetnikov+, 2002)J/ApJ/551/852 : FCRAO CO survey of the outer Galaxy (Heyer+, 2001)J/A+AS/115/81 : A CS(2-1) survey of UC HII regions (Bronfman+, 1996)J/A+A/275/67 : Velocity Field of the outer Galaxy (Brand+ 1993)J/ApJS/63/821 : Inner Galaxy Molecular clouds & cloud cores (Scoville+, 1987)http://www.radioast.nsdc.cn/mwisp.php : MWISP home pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/828/59https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/828/59http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/828/59https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/828/59https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/828/59http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/828/59GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/828/59/table1 (Parameters of 575 molecular clouds identified from ^12^CO(J=1-0) emission)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/828/59/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/828/59/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/828/59/table1?GETtext/xml+votable180.050000true283.740851.774470.005555555555555556Cone search capability for table J/ApJ/828/59/table2 (Parameters of 131 molecular clouds identified from ^13^CO(J=1-0) emission)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/828/59/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/828/59/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/828/59/table2?GETtext/xml+votable180.050000true283.648011.887210.005555555555555556Cone search capability for table J/ApJ/828/59/table3 (Molecular clouds associated with massive star formation regions)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/828/59/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/828/59/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/828/59/table3?GETtext/xml+votable180.050000true284.205483.694190.0055555555555555565/7604 7605 7607 7650 7651 6/30319 30330 30405 30425 30594 30595 30598 30610 30614 30616 30618 30619 30628 30629 30640 30641 30643https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/828/59?format=asciiRadiodefaultJ/ApJ/828/59/table1Parameters of 575 molecular clouds identified from ^12^CO(J=1-0) emissionrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqRunning index numbermeta.id;meta.mainintprimarySFRDisplay associated massive star formation regions data (table 3) within 10"meta.ref.urlintnullableGLONGalactic longitudedegpos.galactic.lonGLATGalactic latitudedegpos.galactic.latVLSR[-57/-10] Local Standard of Rest velocitykm/sphys.veloc;pos.lsrfloatVFWHM[0.3/7] Full Width at Half Maximum of VLSRkm/sspect.line.widthfloatTpeak[1.8/10] Peak temperatureKphys.temperaturefloatArea[0.6/45.3] Areaarcmin**2phys.angSizefloatW12CO[0.5/14.4] Integrated ^12^CO emission line fluxK.km/sphot.flux;em.line.CO;spect.linefloatL12CO[1/223] The ^12^CO luminosityK.km.s**-1.arcmin**2phys.luminosity;em.radiofloat_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data)degpos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data)degpos.eq.decnullableindexedJ/ApJ/828/59/table2Parameters of 131 molecular clouds identified from ^13^CO(J=1-0) emissionTpeak[0.8/3] Peak temperatureKphys.temperaturefloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqRunning index numbermeta.id;meta.mainintprimarySFRDisplay associated massive star formation regions data (table 3) within 10"meta.ref.urlintnullableGLONGalactic longitudedegpos.galactic.lonGLATGalactic latitudedegpos.galactic.latVLSR[-53/-10] Local Standard of Rest velocitykm/sphys.veloc;pos.lsrfloatVFWHM[0.4/5.1] Full Width at Half Maximum of VLSRkm/sspect.line.widthfloatArea[0.6/7.2] Areaarcmin**2phys.angSizefloatW13CO[0.3/5] Integrated ^13^CO emission line fluxK.km/sphot.flux;em.line.CO;spect.linefloatL13CO[0.4/35] The ^13^CO luminosityK.km.s**-1.arcmin**2phys.luminosity;em.radiofloat_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data)degpos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data)degpos.eq.decnullableindexedJ/ApJ/828/59/table3Molecular clouds associated with massive star formation regionsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMWISPMolecular cloud (MC) name (GLLL.lll+BB.bbb) from the ^13^CO (J=1-0) emission (table 2)meta.id;meta.maincharf_MWISPe: from the ^12^CO (J=1-0) emission (table 1)meta.codecharGLONMC Galactic longitudedegpos.galactic.lonGLATMC Galactic latitudedegpos.galactic.latVel[-51/-12] MC LSR velocity (from table 2 or 1)km/sphys.veloc;pos.lsrfloatTracerTracer designation (1)meta.id.assoccharGTLAT? Tracer Galactic longitude (1)degpos.galactic.lonfloatnullableGTLON? Tracer Galactic latitude (1)degpos.galactic.latfloatnullableVLSR[-55.1/-10.5]? LSR velocity (1)km/sphys.veloc;pos.lsrfloatnullablef_VLSR[f] Flag on VLSR (2)meta.codecharRefReference(s) (3)meta.ref;pos.framechar_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data)degpos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data)degpos.eq.decnullableindexed