Hostname: page-component-78c5997874-s2hrs Total loading time: 0 Render date: 2024-11-05T22:37:11.607Z Has data issue: false hasContentIssue false
  • English
  • Français

Dynamical Influences of the Last Magellanic Interaction on the Magellanic Clouds

Published online by Cambridge University Press:  05 March 2013

Kenji Bekki  and
Masashi Chiba
Kenji Bekki*
Affiliation:
School of Physics, University of New South Wales, Sydney NSW 2052, Australia.
Masashi Chiba
Affiliation:
Astronomical Institute, Tohoku University, Sendai 980-8578, Japan.
*
CCorresponding author. Email: [email protected]
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

We investigate the present distributions of gas and young stars in the Large and Small Magellanic Clouds (LMC and SMC) based on fully self-consistent numerical simulations of the Clouds for the last ∼0.8 Gyr. Our principal results, which can be tested against observations, are as follows. The last dynamical and hydrodynamical interaction between the Clouds about ∼0.2 Gyr ago can form the apparently off-center bar and peculiar Hı spirals of the LMC. The present spatial distributions of young stars with ages less than ∼20 Myr in the LMC can be significantly asymmetric and clumpy owing to the interaction. A small but non-negligible fraction of stellar and gaseous components can be transferred from the SMC into the LMC during the interaction to form diffuse halo components around the LMC. The burst of star formation in the SMC can be synchronized with that of the LMC about 0.2 Gyr ago in some models. New stars can form from gas in the SMC's tidal tails, one of which can be observed as the Magellanic Bridge (MB). The metallicity distribution function of new stars in the MB has a peak of [Fe/H] ∼ −0.8, which is significantly smaller than the stellar metallicity of the SMC. Based on these results, we discuss the origin of 30 Doradus, the southern molecular ridge of the LMC, the globular cluster ESO 121-SC03, metal-poor inter-Cloud stars within the MB, and giant Hı holes of the LMC.

Keywords

galaxies: Magellanic Cloudsgalaxies: star clustersgalaxies: stellar contentgalaxies: interactions
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 24 , Issue 1 , 2007 , pp. 21 - 29
Copyright
Copyright © Astronomical Society of Australia 2007

References

Bekki, K. & Chiba, M., 2005, MNRAS, 356, 680 CrossRefGoogle Scholar
Bekki, K. & Chiba, M., 2006, ApJ, 637, L97 CrossRefGoogle Scholar
Bekki, K., Beasley, M. A., Forbes, D. A. & Couch, W. J., 2004a, ApJ, 602, 730 CrossRefGoogle Scholar
Bekki, K., Couch, W. J., Beasley, M. A., Forbes, D. A., Chiba, M. & Da Costa, G., 2004b, ApJ, 610, L93 Google Scholar
Broeils, A. H. & van Woerden, H., 1994, A&AS, 107, 129 Google Scholar
Da Costa, G. S., 1991, in IAU Symp., 148, The Magellanic Clouds, Eds. Haynes, R. & Milne, D. (Dordrecht: Kluwer), 183 Google Scholar
de Boer, K. S., Braun, J. M., Vallenari, A. & Mebold, U., 1998, A&A, 329, L49 Google Scholar
de Vaucouleurs, G. & Freeman, K. C., 1972, VA, 14, 163 Google Scholar
Efremov, Y. N., 2004, ASP Conf. Ser., 316, Order and Chaos in Stellar and Planetary Systems, Eds. Byrd, G., Kholshevnikov, K., Myllri, A., Nikiforov, I. & Orlov, V. (San Francisco: Astronomical Society of the Pacific), 261 Google Scholar
Feitzinger, V., Glassgold, A. E., Gerola, H. & Seiden, P. E., 1981, A&A, 98, 371 Google Scholar
Freeman, K. C., 1984, in IAU Symp., 108, Structure and Evolution of the Magellanic Clouds, Eds. van den Bergh, S. & Boer, K. S. D. (Dordrecht: Reidel), 107 Google Scholar
Fujimoto, M. & Kumai, Y., 1997, AJ, 113, 249 Google Scholar
Fukui, Y., et al., 1999, PASJ, 51, 745 CrossRefGoogle Scholar
Gardiner, L. T. & Noguchi, M., 1996, MNRAS, 278, 191 CrossRefGoogle Scholar
Gardiner, L. T., Turfus, C. & Putman, M. E., 1998, ApJ, 507, L35 CrossRefGoogle Scholar
Geisler, D., Bica, E., Dottori, H., Clari, J. J., Piatti, A. E. & Santos, J. F. C. Jr., 1997, AJ, 114, 1920 CrossRefGoogle Scholar
Girardi, L., Chiosi, C., Bertelli, G. & Bressan, A., 1995, A&A, 298, 877 Google Scholar
Harris, J., 2007, ApJ, in press (astro-ph/0612107)Google Scholar
Harris, J. & Zaritsky, D., 2004, AJ, 127, 1531 CrossRefGoogle Scholar
Irwin, M. J., Demers, S. & Kunkel, W. E., 1990, AJ, 99, 191 CrossRefGoogle Scholar
Kallivayalil, N., van der Marel, R. P. & Alcock, C., 2006, ApJ, 652, 1213 CrossRefGoogle Scholar
Kawamura, A., et al., 2007, in preparationGoogle Scholar
Kennicutt, R. C. Jr., 1998, ARA&A, 36, 189 Google Scholar
Kunkel, W. E., Demers, S., Irwin, M. J. & Albert, L., 1997, ApJ, 488, L129 Google Scholar
Luks, Th. & Rohlfs, K., 1992, A&A, 263, 41 Google Scholar
Mackey, A. D., Payne, M. J. & Gilmore, G. F., 2006, MNRAS, 369, 921 CrossRefGoogle Scholar
Mateo, M., Hodge, P. & Schommer, R. A., 1986, ApJ, 311, 113 CrossRefGoogle Scholar
Mizuno, N., Muller, E., Maeda, H., Kawamura, A., Minamidani, T., Onishi, T., Mizuno, A. & Fukui, Y., 2006, ApJ, 643, L107 CrossRefGoogle Scholar
Murai, T. & Fujimoto, M., 1980, PASJ, 32, 581 Google Scholar
Olsen, K. A. G. & Massey, P., 2007, ApJ, 656, L61 CrossRefGoogle Scholar
Ott, J., et al., 2007, in preparationGoogle Scholar
Piatti, A. E., Sarajedini, A., Geisler, D., Seguel, J. & Clark, D., 2005, MNRAS, 358, 1215 CrossRefGoogle Scholar
Rhode, K. L., Salzer, J. J., Westpfahl, D. J. & Radice, L. A., 1999, AJ, 118, 323 CrossRefGoogle Scholar
Rolleston, W. R. J., Dufton, P. L., McErlean, N. D. & Venn, K. A., 1999, A&A, 348, 728 Google Scholar
Selman, F., Melnick, J., Bosch, G. & Terlevich, R., 1999, A&A, 347, 532 Google Scholar
Staveley-Smith, L., Kim, S., Calabretta, M. R., Haynes, R. F. & Kesteven, M. J., 2003, MNRAS, 339, 87 CrossRefGoogle Scholar
Subramaniam, A. & Prabhu, T. P., 2005, ApJ, 625, L47 CrossRefGoogle Scholar
Susa, H. & Umemura, M., 2004, ApJ, 610, L5 CrossRefGoogle Scholar
van den Bergh, S., 2000, The Galaxies of the Local Group (Cambridge: Cambridge University Press)Google Scholar
van der Marel, R. P., 2001, AJ, 122, 1827 CrossRefGoogle Scholar
Vazdekis, A., Casuso, E., Peletier, R. F. & Beckman, J. E., 1996, ApJS, 106, 307 Google Scholar
Yoshizawa, A. & Noguchi, M., 2003, MNRAS, 339, 1135 CrossRefGoogle Scholar
Weinberg, M. D., 2000, ApJ, 532, 922 CrossRefGoogle Scholar
Westerlund, B. E., 1997, The Magellanic Clouds (Cambridge: Cambridge University Press)Google Scholar
Zaritsky, D. & Harris, J., 2004, ApJ, 604, 167 Google Scholar