Multiple dynamical components in Local Group dwarf spheroidals
نویسندگان
چکیده
منابع مشابه
The counterparts of Local Group dwarf spheroidals in nearby clusters
In this contribution, we report on the discovery of dwarf spheroidals (dSphs) in the core of the Fornax cluster. Their photometric properties – like magnitude, colour, surface brightness – are very similar to those of Local Group dSphs. However, at a given total magnitude, dSphs in Fornax seem to be more extended than their Local Group counterparts. The membership of several dwarf galaxy candid...
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We use N-body simulations to explore the effects of tidal stripping on the structure of dwarf spheroidal galaxies (dSphs). Our models assume cosmologically motivated initial conditions where dSphs are modeled as King spheres, embedded in Navarro-Frenk-White dark halos and orbiting the Galactic potential on eccentric orbits. As expected, systems that orbit through dense regions of the Galaxy los...
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We examine the dynamics of stellar systems embedded within cold dark matter (CDM) halos in order to assess observational constraints on the dark matter content of Local Group dwarf spheroidals (dSphs). Approximating the stellar and dark components by King and NFW models, respectively, we identify the parameters of dark halos consistent with the kinematics and spatial distribution of stars in dS...
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We use N-body simulations to study the evolution of dwarf spheroidal galaxies (dSphs) driven by galactic tides. We adopt a cosmologically-motivated model where dSphs are dark matter-dominated systems on eccentric orbits whose stellar component may be approximated by a King model embedded within an NFW halo. We find that these NFW-embedded King models are extraordinarily resilient to tides; the ...
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The Local Group offers an excellent laboratory for near-field cosmology by permitting us to use the resolved stellar content of its constituent galaxies as probes of galaxy formation and evolution, which in turn is an important means for testing cosmological models of hierarchical structure formation. In this review, we discuss the the least massive, yet most numerous type of galaxy in the Loca...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society: Letters
سال: 2007
ISSN: 1745-3925,1745-3933
DOI: 10.1111/j.1745-3933.2007.00353.x