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Science in China Series A: Mathematics

, Volume 44, Issue 4, pp 536–544 | Cite as

13CO mapping study for massive molecular cloud cores

  • Yuefang Wu
  • Junzhi Wang
  • Jingwen Wu
  • Huirong Yan
  • Chengming Lei
  • Jinjiang Sun
  • Liming Wang
Article

Abstract

Using the newly installed SIS receiving system on the 13.7 m telescope at Qinghai Station of PMO, United Radio Astronomy of CAS, CO isotope13CO J= 1-0 and C18O J= 1-0 lines were observed for three sources S241, S39 and ON3. Results show that the three sources have massive cores, of which the size is ∼ 2-5 pc, masses are ∼ 103- 104M⊙. The widths of lines are also larger than those in low mass cores. And high velocity characteristics were observed for all the sources. The VLSR distribution presents rotation of the core in ON3. And all the three cores contain deeply embedded forming massive stars. The young stellar objects in S241 and ON3 seem to be moving away from their birth sites.

Keywords

interstellar matter molecular clouds interstellar dynamics star formation 

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References

  1. 1.
    Myers, P. C, Linke, R. A., Benson, P. J., Dense cores in dark clouds. I-CO observations and column densities of high-extinction regions, Ap J., 1983, 264: 517.CrossRefGoogle Scholar
  2. 2.
    Beichman, C. A., Myers, P. C., Emerson, J. P. et al., Candidate solar-type protostars in nearby molecular cloud cores, Ap J., 1986, 307: 337.CrossRefGoogle Scholar
  3. 3.
    Wu, Y., Outflow near the low-mass young stellar objects, Progress in Astronomy, 1990, 4: 291.Google Scholar
  4. 4.
    Lada, C. J., Cold outflows, energetic winds and enigmatic jets around young stellar objects, AR A & A, 1985, 23: 267.Google Scholar
  5. 5.
    Kutner, M. L., Ulich, B. L., Recommendations for calibration of millimeter-wavelength spectral line data, Ap J., 1981, 250: 341.CrossRefGoogle Scholar
  6. 6.
    Evans, N. J. II, Physical conditions in regions of star formation, AR A&A, 1999, 37: 311.Google Scholar
  7. 7.
    Scoville, H. Z., Sargent, A. T., Sanders, D. B. et al., High-resolution mapping of molecular outflows in NGC2071, W49, and NGC7538, Ap J., 1986, 303: 416.CrossRefGoogle Scholar
  8. 8.
    Wu, Y., Li, Y., Lu, J. et al., A Co survey for high velocity gas in interstellar H2O maser sources, Acta Astrophysics Sinica, 1998, 18: 415.Google Scholar
  9. 9.
    Casoli, F., Combes, F., Dupraz, C. et al.,13CO and CO observations of cold IRAS unidentified point sources in the Galaxy, A&A, 1986, 169: 281.Google Scholar
  10. 10.
    Wu, Y., Yang, C., Li, Y., High velocity gas in S241 and IRAS19529 + 2704, C A & A, 1999, 23: 6.Google Scholar
  11. 11.
    Wood, D. O. S., Churchwell, E. D., The morphologies and physical properties of ultracompact H II regions, Ap J., 1989, 340: 265.CrossRefGoogle Scholar
  12. 12.
    Wouterloot, J. G. A., Brand, J., Henkel, C., Star formation in the outer Galaxy, A&A, 1988, 191: 323.Google Scholar
  13. 13.
    Jaffe, D. T., Guesten, R., Domes, D., New H2O masers associated with far-infrared sources, Ap J., 1981, 250: 621.CrossRefGoogle Scholar
  14. 14.
    Comoretto, G., Palagi, F., Cesaroni, R. et al., The arcetri atlas of H2O maser sources, A & A S, 1990, 84: 179.Google Scholar
  15. 15.
    Genzel, R., Downes, D., H2O in the galaxy: sites of newly formed OB stars, A & A S, 1977, 30: 145.Google Scholar
  16. 16.
    Myers, P. C., Turbulence and collapse in star-forming clouds, in Proc. IAV Symp. 182, CO: Twenty-five Years of Millimeter-wave Spectroscopy Tucson, 1995 (eds. Latter, W. B., Radford, S. J. E., Jewell, P. Q. et al.), Dordrecht: Kluwer Academic Publishen, 1997, 137.Google Scholar

Copyright information

© Science in China Press 2001

Authors and Affiliations

  • Yuefang Wu
    • 1
  • Junzhi Wang
    • 1
  • Jingwen Wu
    • 1
  • Huirong Yan
    • 2
  • Chengming Lei
    • 2
  • Jinjiang Sun
    • 2
  • Liming Wang
    • 2
  1. 1.Astronomy Department, CAS-PKU Joint Beijing Astrophysics CenterPeking UniversityBeijingChina
  2. 2.Qinghai Station, Purple Mountain ObservatoryChinese Academy of SciencesDelinghaChina

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