N-body simulations of the Magellanic stream

A suite of high-resolution N-body simulations of the Magellanic Clouds–Milky Way system are presented and compared directly with newly available data from the H i Parkes All-Sky Survey (HIPASS). We show that the interaction between Small Magellanic Clouds (SMC) and Large Magellanic Clouds results in both a spatial and kinematical bifurcation of both the stream and the leading arm. The spatial bifurcation of the stream is readily apparent in the HIPASS data, and the kinematical bifurcation is also tentatively identified. This bifurcation provides strong support for the tidal disruption origin for the Magellanic stream. A fiducial model for the Magellanic Clouds (MCs) is presented upon completion of an extensive parameter survey of the potential orbital configurations of the MCs and the viable initial boundary conditions for the disc of the SMC. The impact of the choice of these critical parameters upon the final configurations of the stream and leading arm is detailed.

[1]  M. Irwin,et al.  A radial velocity survey of low Galactic latitude structures – I. Kinematics of the Canis Major dwarf galaxy , 2005, astro-ph/0503705.

[2]  D. O. Astronomy,et al.  The Parkes HI survey of the Magellanic System , 2004, astro-ph/0411453.

[3]  J. Peñarrubia,et al.  Large scale inhomogeneity and local dynamical friction , 2004, astro-ph/0410740.

[4]  Stuart P. D. Gill,et al.  Mapping substructures in dark matter haloes , 2004, astro-ph/0407418.

[5]  S. Tremaine,et al.  Galactic Dynamics , 2005 .

[6]  K. Bekki,et al.  Formation and evolution of the Magellanic Clouds – I. Origin of structural, kinematic and chemical properties of the Large Magellanic Cloud , 2004, astro-ph/0412318.

[7]  W. Couch,et al.  Explaining the Mysterious Age Gap of Globular Clusters in the Large Magellanic Cloud , 2004, astro-ph/0406443.

[8]  HongSheng Zhao.  Dynamical friction for dark halo satellites: effects of tidal mass loss and growing host potential , 2004, astro-ph/0403564.

[9]  L. Staveley-Smith,et al.  A New Look at the Kinematics of Neutral Hydrogen in the Small Magellanic Cloud , 2003, astro-ph/0312223.

[10]  A. Yoshizawa,et al.  The dynamical evolution and star formation history of the Small Magellanic Cloud: effects of interactions with the Galaxy and the Large Magellanic Cloud , 2003 .

[11]  B. Gibson,et al.  GCD+: a new chemodynamical approach to modelling supernovae and chemical enrichment in elliptical galaxies , 2002, astro-ph/0212401.

[12]  L. Staveley-Smith,et al.  High-resolution H I observations of the Western Magellanic Bridge , 2002, astro-ph/0210615.

[13]  B. Gibson,et al.  The Magellanic Stream, High-Velocity Clouds, and the Sculptor Group , 2002, astro-ph/0209127.

[14]  J. Makino,et al.  To Circularize or Not To Circularize?—Orbital Evolution of Satellite Galaxies , 2002, astro-ph/0208452.

[15]  N. Suntzeff,et al.  New Understanding of Large Magellanic Cloud Structure, Dynamics, and Orbit from Carbon Star Kinematics , 2002, astro-ph/0205161.

[16]  R. Sancisi,et al.  Astronomy & Astrophysics manuscript no. (will be inserted by hand later) The Westerbork HI Survey of Spiral and Irregular Galaxies I. HI Imaging of Late-type Dwarf Galaxies , 2002 .

[17]  B. Gibson,et al.  Galactic Cannibalism: The Origin of the Magellanic Stream , 2002, astro-ph/0201401.

[18]  R. Davé,et al.  The Growth of Galaxies in Cosmological Simulations of Structure Formation , 2001, astro-ph/0106282.

[19]  B. Gibson,et al.  The HI Parkes All Sky Survey: southern observations, calibration and robust imaging , 2001 .

[20]  B. Wakker.  Distances and Metallicities of High- and Intermediate-Velocity Clouds , 2001, astro-ph/0102147.

[21]  B. Gibson,et al.  Metal Abundances in the Magellanic Stream , 2000, astro-ph/0007078.

[22]  R. Sault,et al.  The large‐scale HI structure of the Small Magellanic Cloud , 1999 .

[23]  B. Gibson,et al.  Tidal disruption of the Magellanic Clouds by the Milky Way , 1998, Nature.

[24]  W. Sargent,et al.  The Metallicity and Dust Content of HVC 287.5+22.5+240: Evidence for a Magellanic Clouds Origin , 1997, astro-ph/9710045.

[25]  B. Croke,et al.  Kinematics of carbon stars in the outer regions of the Small Magellanic Cloud , 1997 .

[26]  L. Gardiner,et al.  N-body Simulations of the Small Magellanic Cloud and the Magellanic Stream , 1995, astro-ph/9503095.

[27]  Konrad KuijkenJohn Dubinski.  Nearly self-consistent disc–bulge–halo models for galaxies , 1995, astro-ph/9502051.

[28]  D. Lin,et al.  The motion of the Magellanic clouds, origin of the Magellanic Stream, and the mass of the Milky Way , 1995 .

[29]  M. Irwin,et al.  A dwarf satellite galaxy in Sagittarius , 1994, Nature.

[30]  T. Sawa,et al.  Numerical simulations of the Magellanic system – I. Orbits of the Magellanic Clouds and the global gas distribution , 1994 .

[31]  Marc Davis,et al.  The origin of the Magellanic Stream , 1994, astro-ph/9401008.

[32]  R. Schommer,et al.  Spectroscopy of Giants in LMC Clusters. II Kinematics of the Cluster Sample , 1992 .

[33]  S. Tremaine,et al.  The mass of the galaxy , 1991 .

[34]  N. Suntzeff,et al.  The kinematics of the Small Magellanic Cloud from its field carbon stars , 1989 .

[35]  J. Manfroid.  Nearby galaxies Catalog -- R. B. Tully , 1988 .

[36]  Alistair R. Walker,et al.  Cepheids as Distance Indicators , 1999 .

[37]  H. Ford,et al.  Kinematics and internal dynamics of planetary nebulae in the small Magellanic Cloud , 1985 .

[38]  S. Faber,et al.  Is there nonluminous matter in dwarf spheroidal galaxies , 1983 .

[39]  E. Recillas-Cruz.  Spectral types in the direction of the Magellanic Stream , 1982 .

[40]  A. Poland.  The Structure and Fluctuations of a Coronal Streamer. , 1976 .

[41]  B. Milliard,et al.  The Boron Abundance in Sirius and Vega , 1976 .

[42]  D. Mathewson.  The Magellanic Stream , 1974, Publications of the Astronomical Society of Australia.