منابع مشابه
Are " Dwarf " Ellipticals Genuine Ellipticals?
We review the systematic properties of “dwarf” elliptical (dE) galaxies, focussing on the relation between “normal” and “dwarf” ellipticals. In recent years, this relation has been described as “dichotomy” – based essentially on a discontinuity in central surface brightness. We show that, outside of 300 pc from the centre, the Sérsic profile parameters vary continuously from “normal” to “dwarf”...
متن کاملA Sample of Field Ellipticals
Using well-defined selection criteria applied to the LEDA galaxy catalogue we have constructed a sample of elliptical galaxies that can be taken to lie in the field. Such criteria can easily be applied to theoretical simulations for direct comparison with observations. The variation of the number of ‘isolated’ ellipticals with selection criteria is also investigated. A preliminary study of the ...
متن کاملPre-enriched, not primordial ellipticals
We follow the chemical evolution of a galaxy through star formation and its feedback into the inter-stellar medium (ISM), starting from primordial gas and allowing for gas to inflow into the region being modelled. We attempt to reproduce observed spectral line-strenghts for early-type galaxies to constrain their star formation histories (SFH). The efficiencies and times of star formation are va...
متن کاملPhotometry and Spectroscopy of Coma Dwarf Ellipticals
We have used deep B− and R−band CCD images (with ≃ 1.2 ′′ seeing) of the central ≃ 700 arcmin of the Coma cluster core (and an associated ≃ 270 arcmin control field) to study the early-type dwarf elliptical (dE) galaxy population (Secker & Harris 1997; Secker, Harris & Plummer 1997). In the left panel of Fig. 1, we plot a subset of the total cluster field CMD: the galaxy sequence is clearly vis...
متن کاملThe fate of cannibalized fundamental-plane ellipticals
Evolution and disruption of galaxies orbiting in the gravitational field of a larger cluster galaxy are driven by three coupled mechanisms: 1) the heating due to its time dependent motion in the primary; 2) mass loss due to the tidal strain field; and 3) orbital decay. Previous work demonstrated that tidal heating is effective well inside the impulse approximation limit. Not only does the overa...
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ژورنال
عنوان ژورنال: The Astronomical Journal
سال: 2016
ISSN: 1538-3881
DOI: 10.3847/0004-6256/152/6/214