J/ApJ/921/23ivo://CDS.VizieR/J/ApJ/921/23doi:10.26093/cds/vizier.19210023CDSGuo W.Chen X.Feng J.Sun LiWang C.Su Y.Sun Y.Ao Y.Zhang S.,Zhou X.Yuan L.Yang Ji2024-06-07T14:09:01Z2023-03-20T16:01:42ZCDS support team

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

cds-question@unistra.frinterstellar-mediumco-line-emissionsurveysmolecular-cloudsyoung-stellar-objectsWe present the survey of ^12^CO/^13^CO/C^18^O (J=1-0) toward the California molecular cloud (CMC) within the region of 161.75{deg}<=l<=167.75{deg}, -9.5{deg}<=b<=-7.5{deg} using the Purple Mountain Observatory (PMO) 13.7m millimeter telescope. Adopting a distance of 470pc, the mass of the observed molecular cloud estimated from ^12^CO, ^13^CO, and C^18^O is about 2.59x10^4^, 0.85x10^4^, and 0.09x10^4^M_{sun}_, respectively. A large-scale continuous filament extending about 72pc is revealed from the ^13^CO images. A systematic velocity gradient perpendicular to the major axis appears and is measured to be ~0.82km/s/pc. The kinematics along the filament shows an oscillation pattern with a fragmentation wavelength of ~2.3pc and velocity amplitude of ~0.92km/s, which may be related to core-forming flows. Furthermore, assuming an inclination angle to the plane of the sky of 45{deg}, the estimated average accretion rate is ~101M_{sun}_/Myr for the cluster LkH{alpha} 101 and ~21M_{sun}_/Myr for the other regions. In the C^18^O observations, the large-scale filament could be resolved into multiple substructures, and their dynamics are consistent with the scenario of filament formation from converging flows. Approximately 225 C^18^O cores are extracted, of which 181 are starless cores. Roughly 37% (67/181) of the starless cores have {alpha}vir less than 1. Twenty outflow candidates are identified along the filament. Our results indicate active early-phase star formation along the large-scale filament in the CMC region.2021ApJ...921...23Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/921/23CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/197 : ISM towards IC 348 and Per OB2 (Cernis, 1993)J/A+A/487/993 : MAMBO Mapping of c2d Clouds and Cores (Kauffmann+, 2008)J/ApJ/699/1092 : Giant molecular clouds (SRBY) (Heyer+, 2009)J/ApJ/715/671 : X-ray and IR emission from YSOs (Wolk+, 2010)J/A+A/554/A55 : C^18^O(1-0) and N_2_H^+^(1-0) in L1495/B213 (Hacar+, 2013)J/ApJ/764/133 : Auriga-California giant molecular cloud (Harvey+, 2013)J/ApJ/767/36 : APEX observations of HOPS protostars (Stutz+, 2013)J/ApJ/786/37 : Auriga-California molecular cloud (Broekhoven-Fiene+, 2014)J/A+A/588/A104 : Molecular clouds and star formation (Gong+, 2016)J/A+A/606/A100 : YSOs in California Molecular Cloud (Lada+, 2017)J/ApJ/838/49 : CO large-field observations around l=150{deg} (Xiong , 2017)J/A+A/616/A78 : Dust extinction map of the Nessie filament (Mattern+, 2018)J/A+A/620/A163 : Cores in California molecular cloud (Zhang+, 2018)J/A+A/642/A76 : California molecular cloud CO datacubes (Zhang+, 2020)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/921/23https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/921/23http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/921/23https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/921/23https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/921/23http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/921/23GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/921/23/table4 (Properties of the identified dense cores)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/921/23/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/921/23/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/921/23/table4?GETtext/xml+votable180.050000true67.6649735.483290.0055555555555555566/1229 1231 1235 1240 1242-1243 1253 1261 1263-1266 1272 1274https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/921/23?format=asciiRadiodefaultJ/ApJ/921/23/table4Properties of the identified dense cores_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.decindexedMWISPCore position-based name (GLLL.lll+B.bbb)meta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintamaj[0.97/6.8] Angular size, major axisarcminphys.angSizefloatNH2[0.56/14.03] Column density, H21e+21cm**-2phys.columnDensityfloatnH2[2.15/294.71] Volume number density, H21000cm**-3meta.bib.volumefloatMLTE[0.7/53.1] LTE MasssolMassphys.massfloatMvir[0.61/22.21] Virial MasssolMassphys.massfloataVir[0.3/2.49] Virial {alpha} parameter, Mvir/MLTEphys.mass;arith.ratiofloatSimbadSimbad 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.raindexedbmin[0.98/5.4] Angular size, minor axisarcminphys.angSize;srcfloatPA[-85.6/177.4] Position Angledegpos.posAngfloatVlsr[-3.31/0.52] Velocity relative to LSRkm/sphys.veloc;pos.lsrfloatDV[0.17/0.71] Line FWHMkm/sspect.line.widthfloatReff[0.02/0.28] Effective (deconvolved) radiuspcphys.size.radiusfloatTex[6.17/33.15] Excitation temperatureKphys.atmol.excitationfloat