C^18^O dense cores identified in the CMC region Virtual Observatory Resource

Authors
  1. Guo W.
  2. Chen X.
  3. Feng J.
  4. Sun Li
  5. Wang C.
  6. Su Y.
  7. Sun Y.
  8. Ao Y.
  9. Zhang S.,Zhou X.
  10. Yuan L.
  11. Yang Ji
  12. Published by
    CDS
Abstract

We 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.

Keywords
  1. interstellar-medium
  2. co-line-emission
  3. surveys
  4. molecular-clouds
  5. young-stellar-objects
Bibliographic source Bibcode
2021ApJ...921...23G
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/921/23
IVOA Identifier IVOID
ivo://CDS.VizieR/J/ApJ/921/23
Document Object Identifer DOI
doi:10.26093/cds/vizier.19210023

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History

2023-03-20T16:01:42Z
Resource record created
2023-03-20T16:01:42Z
Created
2024-06-07T14:09:01Z
Updated

Contact

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