Unraveling NGC 205's Interaction with Andromeda (M31)

Details Unraveling NGC 205's Interaction with Andromeda (M31) Unraveling NGC 205's Interaction with Andromeda (M31)

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20917703h&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #177.03; Bulletin of the American Astronomical Society,

Astronomy and Astrophysics

Astronomy

Scientific paper

NGC 205 is our nearest example of a dwarf elliptical (dE) galaxy, lying a projected 37 arcminutes from Andromeda (M31). Its proximity provides the means for understanding the role of dEs in hierarchical galaxy formation. Detailed photometric observations by Choi et al (2002) and kinematic observations by Geha et al (2006) suggest that NGC 205 is currently undergoing tidal disruption from its interaction with M31. Although attempts have been made to carefully understand the properties of NGC205, such as its mass and distance from M31, they are still not well known. We attempt to resolve these uncertainties by exploring the interaction between NGC 205 with M31 using a restricted N-body approach to investigate the mass and orbital parameters of NGC 205. We define our system using 10 parameters and use the tidally distorted photometric and kinematic observations as constraints. Since our constrained parameter space contains approximately 10^22 possible orbits, a genetic algorithm is employed for optimization. These simulations provide tighter constraints on the orbit and internal structure/dynamics of NGC 205. This research was supported by funds from NSF and NASA/STScI.

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