Hostname: page-component-7479d7b7d-68ccn Total loading time: 0 Render date: 2024-07-15T22:45:02.071Z Has data issue: false hasContentIssue false
  • English
  • Français

On the Kinematics of Tidal Debris from Omega Cen's Progenitor Galaxy

Published online by Cambridge University Press:  05 March 2013

Masashi Chiba  and
Arihiro Mizutani
Masashi Chiba*
Affiliation:
Astronomical Institute, Tohoku University, Sendai 980-8578, Japan
Arihiro Mizutani
Affiliation:
National Astronomical Observatory, Mitaka, Tokyo 181-8588, Japan
*
3E-mail: [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.

The kinematic properties of tidal debris from an orbiting Galactic satellite is presented, on the assumption that its central part once contained the most massive Galactic globular cluster, ω Cen. We simulate dynamical evolution of a satellite galaxy that follows the present-day and likely past orbits of ω Cen, and analyse the kinematic nature of their tidal debris and randomly generated Galactic stars comprising spheroidal halo and flat disk components. It is found that the debris stars show a retrograde rotation at ∼–100 km s–1, which may accord with a recently discovered stellar stream at a radial velocity of ∼300 km s–1 towards the Galactic longitude of ∼270°. These stars also contribute, only in part, to a reported retrograde motion of the outer halo in the north Galactic pole direction, without significantly modifying local halo kinematics near the Sun. The prospects for future debris searches and the implications for the early evolution of the Galaxy are briefly presented.

Keywords

Galaxy: formationglobular clusters: individual (ω Cen)stars: kinematicsstars: Population II
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 21 , Issue 2: The Fifth Workshop on Galactic Chemodynamics , 2004 , pp. 237 - 241
Copyright
Copyright © Astronomical Society of Australia 2004

References

Barnes, J. E. 1987, in Nearly Normal Galaxies: From the Planck Time to the Present, ed. S. Faber (New York: Springer-Verlag), 154 Google Scholar
Beers, T. C., Chiba, M., Yoshii, Y., Platais, I., Hanson, R. B., Fuchs, B., & Rossi, S. 2000, AJ, 119, 2866 (B00)CrossRefGoogle Scholar
Chiba, M., & Beers, T. C. 2000, AJ, 119, 2843 (CB)Google Scholar
Côté, P., Marzke, R. O., West, M. J., & Minniti, D. 2000, ApJ, 533, 869 Google Scholar
Dinescu, D. I. 2002, in Omega Centauri: A Unique Window into Astrophysics, ASP Conf. Series 265, eds. F. van Leeuwen, J. D. Hughes, & G. Piotto (ASP: San Francisco), 365 Google Scholar
Dinescu, D. I., Girard, T. M., & van Altena, W. F. 1999, AJ, 117, 1792 (DGvA)Google Scholar
Freeman, K. C. 1993, in The Globular Cluster–Galaxy Connection, ASP Conf. Series 48, eds. G. H. Smith, & J. P. Brodie (ASP: San Francisco), 608 Google Scholar
Gates, E. I., Gyuk, G., & Turner, M. S. 1995, ApJ, 449, L123 CrossRefGoogle Scholar
Gilmore, G., Wyse, R. F. G., & Norris, J. E. 2002, ApJ, 574, L39 (GWN)Google Scholar
Gnedin, O. Y., Zhao, H.-S., Pringle, J. E., Fall, S. M., Livio, M., & Meylan, G. 2002, ApJ, 568, L23 CrossRefGoogle Scholar
Gould, A., Flynn, C., & Bahcall, J. N. 1998, ApJ, 503, 798 Google Scholar
Ibata, R. A., Wyse, R. F. G., Gilmore, G., Irwin, M. J., & Suntzeff, N. B. 1997, AJ, 113, 634 Google Scholar
King, I. R. 1966, AJ, 71, 64 Google Scholar
Kinman, T. D., Cacciari, C., Bragaglia, A., Buzzoni, A., & Spagna, A. 2003, in Galactic Dynamics Workshop, EAS, 10, 115 Google Scholar
Majewski, S. R. 1992, ApJS, 78, 87 Google Scholar
Mizutani, A., Chiba, M., & Sakamoto, T. 2003, ApJ, 589, L89 Google Scholar
Navarro, J. F., Frenk, C. S., & White, S. D. M. 1997, ApJ, 490, 493 Google Scholar
Norris, J. E., & Da Costa, G. S. 1995, ApJ, 447, 680 Google Scholar
Norris, J. E., Freeman, K. C., & Mighell, K. L. 1996, ApJ, 462, 241 Google Scholar
Shetrone, M. D., Côté, P., & Sargent, W. L. W. 2001, ApJ, 548, 592 Google Scholar
Tsuchiya, T., Dinescu, D. I., & Korchagin, V. I. 2003, ApJ, 589, L29 Google Scholar
White, S. D. M. 1983, ApJ, 274, 53 Google Scholar
Yamagata, T., & Yoshii, Y. 1992, AJ, 103, 117 Google Scholar
Zaritsky, D., & White, S. D. M. 1988, MNRAS, 235, 289 CrossRefGoogle Scholar