, Volume 40, Issue 2, pp 147–153 | Cite as

Mass spectrum of giant molecular clouds in a coagulation model

  • E. V. Volkov
  • N. Ya. Sotnikova


Solutions of Smoluchovski’ equation, describing merging processes in a system of giant molecular clouds, are investigated in detail. Both the case of a constant spatial gas density in the clouds and the case of a constant radial gas density are considered. It is shown that the solution of the coagulation equation is not expressed by a power law that is the same for the entire mass range under consideration. It is also demonstrated that the form of the solution depends on the width of the mass range of the clouds. A comparison with observations shows that the Oort model and the coagulation mechanism can describe the observed cloud mass spectrum quite adequately. Ways of improving the Oort model are suggested.


Molecular Cloud Merging Process Geometrical Cross Section Small Cloud Infinite Range 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

Literature Cited

  1. 1.
    H. S. Liszt, D. Ziang, and W. B. Burton,Astrophys. J.,249, 532 (1981).CrossRefADSGoogle Scholar
  2. 2.
    F. Casoli, F. Combes, and M. Gerin,Astron. Astrophys.,133, 99 (1984).ADSGoogle Scholar
  3. 3.
    D. B. Sanders, P. M. Solomon, and N. Z. Scoville,Astrophys. J.,276, 182 (1984).CrossRefADSGoogle Scholar
  4. 4.
    T. Dame, B. G. Elmegreen, R. Cohen, and P. Thaddeus,Astrophys. J.,305, 892 (1986).CrossRefADSGoogle Scholar
  5. 5.
    P. M. Solomon, A. R. Rivolo, J. Barrett, and A. Yahil,Astrophys. J.,319, 730 (1987).CrossRefADSGoogle Scholar
  6. 6.
    G. Field and W. Saslaw,Astrophys. J.,142, 583 (1965).ADSGoogle Scholar
  7. 7.
    G. Field and J. Hutchings,Astrophys. J.,153, 737 (1968).CrossRefADSGoogle Scholar
  8. 8.
    J. Kwan,Astrophys. J.,229, 567 (1979).CrossRefADSGoogle Scholar
  9. 9.
    F. Casoli and F. Combes,Astron. Astrophys.,110, 287 (1982).ADSGoogle Scholar
  10. 10.
    P. Goldreich and D. Lynden-Bell,Mon. Not. R. Astron. Soc.,130, 97 (1965).ADSGoogle Scholar
  11. 11.
    E. N. Parker,Astrophys. J.,145, 811 (1966).CrossRefADSGoogle Scholar
  12. 12.
    B. G. Elmegreen,Astrophys. J.,344, 306 (1989).CrossRefADSGoogle Scholar
  13. 13.
    B. G. Elmegreen,Astrophys. J.,342, L67 (1989).CrossRefADSGoogle Scholar
  14. 14.
    J. H. Oort,Bull. Astron. Inst. Neth.,12, 177 (1954).ADSGoogle Scholar
  15. 15.
    R. B. Larson,Mon. Not. R. Astron. Soc.,194, 809 (1981).ADSGoogle Scholar
  16. 16.
    P. C. Myers,Astrophys. J.,270, 105 (1983).CrossRefADSGoogle Scholar
  17. 17.
    J. Scalo and A. Lazarian,Astrophys. J.,469, 189 (1996).CrossRefADSGoogle Scholar
  18. 18.
    A. A. Stark and J. Brand,Astrophys. J.,339, 763 (1989).CrossRefADSGoogle Scholar
  19. 19.
    V. M. Voloshchuk,Kinetic Theory of Coagulation [in Russian], Gidrometizdat, Leningrad (1984).Google Scholar
  20. 20.
    B. G. Elmegreen and E. Falgarone,Astrophys. J.,471, 816 (1996).CrossRefADSGoogle Scholar
  21. 21.
    J. Brand and J. G. A. Wouterloot,Astron. Astrophys.,303, 851 (1995).ADSGoogle Scholar
  22. 22.
    N. Sotnikowa (Sotnikova) and E. V. Volkov,Astron. Astrophys.,288, 942 (1994).ADSGoogle Scholar
  23. 23.
    N. Ya. Sotnikova and E. V. Voikov,Astrofizika,37, 615 (1994).Google Scholar
  24. 24.
    N. Ya. Sotnikova and E. V. Volkov,Pis’ma Astron. Zh. (1996) (in press).Google Scholar
  25. 25.
    B. G. Elmegreen,Astrophys. J.,347, 859 (1989).CrossRefADSGoogle Scholar

Copyright information

© Plenum Publishing Corporation 1997

Authors and Affiliations

  • E. V. Volkov
    • 1
  • N. Ya. Sotnikova
    • 1
  1. 1.Astronomical Institute of St. Petersburg UniversityObservatorio National/CNPqBrazil

Personalised recommendations