Dynamics and Stellar Content of the Giant Southern Stream in M31. II. Interpretation

@article{Font2006DynamicsAS,
  title={Dynamics and Stellar Content of the Giant Southern Stream in M31. II. Interpretation},
  author={A. Font and K. Johnston and P. Guhathakurta and S. Majewski and R. Rich},
  journal={The Astronomical Journal},
  year={2006},
  volume={131},
  pages={1436-1444}
}
We examine the nature of the progenitor of the giant stellar stream in M31 using as constraints new radial velocity measurements of stream red giant stars (presented in the companion paper by Guhathakurta and coworkers) along with other M31 data sets available in the literature. We find that the observations are best fitted by orbits that are highly eccentric and close to edge-on, with apocenter to pericenter ratios on the order of 25-30 and with apocenters at or only slightly beyond the… Expand

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References

SHOWING 1-10 OF 27 REFERENCES
The three-dimensional structure of the giant stellar stream in Andromeda
The wide-field CCD camera at the Canada-France-Hawaii Telescope (CFHT) was used to survey the giant stellar stream in the Andromeda galaxy, resolving stars down the red giant branch in M31 to I ≃ 25,Expand
On the dynamics of the Sagittarius dwarf galaxy
We use numerical simulations to test the feasibility of the suggestion by Ibata et al. (1994) that the excess population of stars which they discovered in the Sagittarius region may be the disruptedExpand
Planetary Nebula Kinematics in M31
We present kinematics of 135 planetary nebulae (PNs) in M31 from a survey covering 3.9 deg2 and extending out to 15 kpc from the southwest major axis and more than 20 kpc along the minor axis. TheExpand
INTERPRETING THE MORPHOLOGY OF DIFFUSE LIGHT AROUND SATELLITE GALAXIES
Recent observations of surface brightness distributions of both Milky Way and M31 satellite galaxies have revealed many instances of sudden changes or breaks in the slope of the surface brightnessExpand
Tracing the star stream through M31 using planetary nebula kinematics
We present a possible orbit for the Southern Stream of stars in M31, which connects it to the Northern Spur. Support for this model comes from the dynamics of planetary nebulae (PNe) in the disc ofExpand
Taking measure of the Andromeda halo: A Kinematic analysis of the giant stream surrounding M31
We present a spectroscopic survey of the giant stellar stream found in the halo of the Andromeda galaxy. Taken with the DEIMOS multi-object spectrograph on the Keck2 telescope, these data display aExpand
Great Circle Tidal Streams: Evidence for a Nearly Spherical Massive Dark Halo around the Milky Way
An all-high-latitude sky survey for cool carbon giant stars in the Galactic halo has revealed 75 such stars, of which the majority are new detections. Of these, more than half are clustered on aExpand
ANDROMEDA VIII: A NEW TIDALLY DISTORTED SATELLITE OF M31
We report the detection of a new satellite of M31, projected close to M32. Andromeda VIII is tidally distorted, with length ~10 kpc and width a few kiloparsecs. It contains 5-12 planetary nebulae andExpand
A Prescription for Building the Milky Way's Halo from Disrupted Satellites
We develop a semianalytic method for determining the phase-space population of tidal debris along the orbit of a disrupting satellite galaxy and illustrate its use with a number of applications. WeExpand
Building up the stellar halo of the Galaxy
We study numerical simulations of satellite galaxy disruption in a potential resembling that of the Milky Way. Our goal is to assess whether a merger origin for the stellar halo would leaveExpand
...
1
2
3
...