Origin of the Milky Way disk of satellites: collision of two disk galaxies

Omar Alfonso Bohorquez, Rigoberto Casas Miranda

Abstract


The dwarf satellite galaxies of the Milky Way are structures that are distributed around the galaxy in an anisotropic manner on a structure called VPOS or DoS. This structure does not match the predictions made by the cold dark matter cosmological model. This model predicts a fully isotropic distribution around the Milky Way. To explain the spatial distribution of the satellite several models have been raised. One of which raises the possibility that these galaxies and their spatial distribution were generated by the collision of two disk galaxies several billion years ago. This paper shows N-body performed with Gadget-2 to determine through their results if it is possible that this event occurred in this way. An analysis for different mass ratios between the incident galaxy, called ghost galaxy, and the host galaxy or target galaxy is performed. Finally a cluster analysis on the remaining collision is performed to determine the spatial distribution of the satellites.


Keywords


Local Group Dwarf Galaxy, Galaxy disk, Dark Matter, DoS, VPOS

Full Text:

PDF HTML

References


Kroupa, C. Theis, and C. M. Boily (2005). The great disk of milky-way satellites and cosmological sub-structures. Astronomy and Astrophysics, 431(2):517–521.

Okazaki, T. and Taniguchi, Y. (2000). Dwarf Galaxy Formation Induced by Galaxy Interactions.

ApJ, 543:149–152.

Metz, M., Kroupa, P., and Jerjen, H. (2007). The spatial distribution of the Milky Way and Andromeda satellite galaxies. MNRAS, 374:1125–1145.

(Hernquist, L. (1990). An analytical model for spherical galaxies and bulges. ApJ, 356:359–364. [5] Springel, V. and White, S. D. M. (1999). Tidal tails in cold dark matter cosmologies. MNRAS, 307:162–178.

Toomre, A. and Toomre, J. (1972). Galactic Bridges and Tails. ApJ, 178:623–666. [7] van de Kamp, P. (1964). Elements of Astromechanics. W. H. Freeman and Company.

Pawlowski, M. S., Kroupa, P., and de Boer, K. S. (2011). Making counter-orbiting tidal debris. The origin of the Milky Way disc of satellites? Astronomy and Astrophysics, 532:A118.

Binney. J, T. S. (2008). Galactic Dynamics. Princeton Univ.Press.

McConnachie, A.W. and Irwin, M. J. (2006). The satellite distribution of M31. MNRAS, 365:902–914.

Bullock, J. S., Kaplinghat, M., Fruchter, A., Geha, M., Simon, J., Strigari, L. E., and Willman,B. (2009). Dwarf Galaxies in 2010: Revealing Galaxy Formations Threshold and Testing the Nature of Dark Matter. In astro2010: The Astronomy and Astrophysics Decadal Survey, volume 2010 of ArXiv Astrophysics e-prints, page 32.


Refbacks

  • There are currently no refbacks.


Copyright (c) 2016 TECCIENCIA