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2002AJ....124..310C - Astron. J., 124, 310-331 (2002/July-0)
Tidal interaction of M32 and NGC 205 with M31: surface photometry and numerical simulations.
CHOI P.I., GUHATHAKURTA P. and JOHNSTON K.V.
Abstract (from CDS):
The simulation component of this project is based on the analysis of single-component, spherical satellites that are being tidally disrupted through interactions with their parent galaxy. Generic features of the simulations include an excess in the surface brightness profile at large radii, a depletion zone at intermediate radii, and isophotal elongation and twists that are coincident with breaks in the brightness profile. The two satellites, M32 and NGC 205, display most of these features consistently across the B and I bands, which is strongly suggestive of tidal interaction and probable stripping by M31. We discuss what these observed features can tell us about the satellites' orbital parameters and histories. Specifically, M32 is found to be on a highly eccentric orbit and away from pericenter. Investigating M32's unusual combination of high surface brightness and low luminosity (the hallmark of compact ellipticals), we make empirical estimates of the galaxy's intrinsic properties and conclude that it is not likely to be the residual core of a tidally stripped normal elliptical galaxy, as has been suggested, but rather that its precursor was intrinsically compact.
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Journal keyword(s): Galaxies: Dwarf - Galaxies: Evolution - galaxies: individual (NGC 205, M32) - Galaxies: Interactions - Galaxies: Photometry - Galaxies: Local Group
Simbad objects: 4
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