Astrophysics and Space Science

, Volume 286, Issue 3–4, pp 381–395 | Cite as

Tidal disruption model for the interacting pair of galaxies VV 117 (NGC 2444/45)

  • K.S.V.S. Narasimhan
  • P.M.S. Namboodiri
  • S.M. Alladin


A series of N-body simulations have been performed to interpret the interacting pair of galaxies VV 117 (NGC 2444/45). The galaxies have been modelled assuming a mass ratio two. The simulations use various values for the distance of closest approach and the eccentricity of the relative orbit of the pair. A plausible scenario for the tidal disruption of the less massive galaxy is proposed. NGC2444, having double the mass of NGC 2445, has undergone penetrating collision with the latter in a hyperbolic or a parabolic orbit. After the first collision, the orbit has become bound. Our results show that VV 117 has either just emerged from the first collision or are on the verge of a second collision. NGC 2445suffers considerable disruption and mass loss. NGC 2444 is not affected much. The second collision is expected to culminate in the merger of the two galaxies.

stellar dynamics galaxies: interactions tidal model for VV 117 methods: numerical 


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. Alladin, S.M.: 1965, ApJ 141, 768.CrossRefADSGoogle Scholar
  2. Alladin, S.M., Potdar, A. and Sastry, K.S.: 1975, IAU Symp. 69, 167.ADSGoogle Scholar
  3. Alladin, S.M. and Narasimhan, K.S.V.S.: 1982, Phys. Rep. 92, 339.CrossRefADSGoogle Scholar
  4. Alladin, S.M., Narasimhan, K.S.V.S. and Ballabh, G.M.: 1988, IAU Colloq. 96, 327.ADSGoogle Scholar
  5. Appleton, P.N., Schombert, J.M. and Robson, E.J.: 1999, ApJ 365, 491.Google Scholar
  6. Appleton, P.N.: 1999, IAU Symp. 186, 97.ADSGoogle Scholar
  7. Barlett, R.E. and Charlton, J.C.: 1995, ApJ 449, 497.CrossRefADSGoogle Scholar
  8. Burbidge, E.M. and Burbidge, G.R.: 1959, ApJ 130, 12.CrossRefADSGoogle Scholar
  9. Dekel, A., Lecar, M. and Shaham, J.: 1980, ApJ 241, 946.CrossRefADSGoogle Scholar
  10. Freeman, K.C. and de Vaucouleurs, G.: 1974, ApJ 194, 569.CrossRefADSGoogle Scholar
  11. Gallagher, J.S., Knapp, G.H. and Faber, S.M.: 1981, AJ 86, 1781.CrossRefADSGoogle Scholar
  12. Higdon, J.L., Smith, B.J. and Lord, S.D.: 1995, ApJ 438, L79.CrossRefADSGoogle Scholar
  13. Limber, D.N.: 1965, ApJ 142, 1346.CrossRefADSGoogle Scholar
  14. Makino, J. and Funato, Y: 1993, PASJ 45, 279.ADSGoogle Scholar
  15. McGlynn, T.A.: 1990, ApJ 384, 515.CrossRefADSGoogle Scholar
  16. McNamara, B.R., Sancisi, A., Kenning, P.A. and Junor, W.: 1994, AJ 108, 844.CrossRefADSGoogle Scholar
  17. Miller, R.H.: 1986, A&A 167, 41.ADSGoogle Scholar
  18. Namboodiri, P.M.S. and Kochhar, R.K.: 1990, MNRAS 243, 276.ADSGoogle Scholar
  19. Namboodiri, P.M.S., Cowsik, R. and Sugimoto, D.: 2000, Bull. Astron. Soc. India 28, 529.ADSGoogle Scholar
  20. Namboodiri, P.M.S., Sastry, K.S. and Narasimhan, K.S.V.S.: 2001, Ap&SS 275, 463.zbMATHADSGoogle Scholar
  21. Narasimhan, K.S.V.S. and Alladin, S.M.: 1982, Bull. Astron. Soc. India 10, 244.ADSGoogle Scholar
  22. Narasimhan, K.S.V.S. and Alladin, S.M.: 1983, Bull. Astron. Soc. India 11, 221.ADSGoogle Scholar
  23. Narasimhan, K.S.V.S. and Alladin, S.M.: 1985, Bull. Astron. Soc. India 13, 359.ADSGoogle Scholar
  24. Sandage, A.R.: 1963, ApJ 183, 863.CrossRefADSGoogle Scholar
  25. Spitzer, L.: 1958, ApJ 127, 17.CrossRefADSGoogle Scholar
  26. Struck, C.: 1999, Phys. Rep. 321, 1.CrossRefADSGoogle Scholar
  27. Toomre, A. and Toomre, J.: 1972, ApJ 178, 623.CrossRefADSGoogle Scholar
  28. Vorontsov-Velyaminov, B.A.: 1959, Atlas and Catalogue of Interacting Galaxies, Sternberg Institute, Moscow.Google Scholar

Copyright information

© Kluwer Academic Publishers 2003

Authors and Affiliations

  • K.S.V.S. Narasimhan
    • 1
  • P.M.S. Namboodiri
    • 2
  • S.M. Alladin
    • 3
  1. 1.Inter-University Centre for Astronomy and AstrophysicsPuneIndia
  2. 2.Indian Institute of AstrophysicsBangaloreIndia
  3. 3.Department of AstronomyOsmania UniversityHyderabadIndia

Personalised recommendations