The M31 Velocity Vector. III. Future Milky Way-M31-M33 Orbital Evolution, Merging, and Fate of the Sun

Abstract

We study the future orbital evolution and merging of the MW-M31-M33 system, using a combination of collisionless N-body simulations and semi-analytic orbit integrations. Monte-Carlo simulations are used to explore the consequences of varying the initial phase-space and mass parameters within their observational uncertainties. The observed M31 transverse velocity implies that the MW and M31 will merge t = 5.86 (+1.61-0.72) Gyr from now, after a first pericenter at t = 3.87 (+0.42-0.32) Gyr. M31 may (probability p=41%) make a direct hit with the MW (defined here as a first-pericenter distance less than 25 kpc). Most likely, the MW and M31 will merge first, with M33 settling onto an orbit around them. Alternatively, M33 may make a direct hit with the MW first (p=9%), or M33 may get ejected from the Local Group (p=7%). The MW-M31 merger remnant will resemble an elliptical galaxy. The Sun will most likely (p=85%) end up at larger radius from the center of the MW-M31 merger remnant than its current distance from the MW center, possibly further than 50 kpc (p=10%). The Sun may (p=20%) at some time in the next 10 Gyr find itself moving through M33 (within 10 kpc), but while dynamically still bound to the MW-M31 merger remnant. The arrival and possible collision of M31 (and possibly M33) with the MW is the next major cosmic event affecting the environment of our Sun and solar system that can be predicted with some certainty. (Abridged)

arXiv comment58 pages, 16 figures, to be published in ApJ. Version with high resolution figures and N-body movies available at http://www.stsci.edu/~marel/M31 . Press materials, graphics, and visualizations available at http://hubblesite.org/newscenter/archive/releases/2012/20

References in corpus (12)

• The M-sigma and M-L Relations in Galactic Bulges and Determinations of their Intrinsic Scatter
• Halos and galaxies in the standard cosmological model: results from the Bolshoi simulation
• LCDM-based models for the Milky Way and M31 I: Dynamical Models
• Are the Magellanic Clouds on their First Passage about the Milky Way?
• HI kinematics and dynamics of Messier 31
• The Luminosity Profile and Structural Parameters of the Andromeda Galaxy
• A warped disk model for M33 and the 21-cm line width in spiral galaxies
• Are disk galaxies the progenitors of giant ellipticals?
• Radial and Transverse Velocities of Nearby Galaxies
• Bar imprints on the inner gas kinematics of M33
• Revisiting the Role of M31 in the Dynamical History of the Magellanic Clouds
• A Dynamical Model of the Local Group

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