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2012MNRAS.427..204D - Mon. Not. R. Astron. Soc., 427, 204-244 (2012/November-3)
Surface brightness and intrinsic luminosity of ellipticals.
DHAR B.K. and WILLIAMS L.L.R.
Abstract (from CDS):
Galaxy structure can thus be modelled extremely well with a central mass excess for all galaxies. This is not necessarily contrary to the notion of a mass deficit in `core' galaxies, since mass ejection due to core scouring by a supermassive black hole (SMBH) binary could have affected the shape of the central components. However, we show that the existence, amount, radial extent and sign of such deficits disagree substantially in the literature, both for a given galaxy and on an average over a sample. We discuss possible implications and suggest that SMBH binaries are unlikely to be the sole mechanism for producing the large `cores' of massive galaxies.
Using results from the SAURON survey, we deduce that under certain conditions of symmetry, inclination angles and degree of triaxiality, the intrinsic (3D) density of light can be well described with a multicomponent Einasto model for both steep- and shallow-cusp galaxies. This indicates a universality in the functional form describing the 3D density distribution of light in galaxies and dark matter in Λ cold dark matter (ΛCDM) N-body haloes. Finally, planetary nebulae and strong-lensing observations, and the Einasto index n of ΛCDM dark matter haloes, indicate that our result – the outer component of the surface brightness profiles of massive galaxies has 5 ≲ n ≲ 8 – could imply (i) a common feature of collisionless systems; and (ii) that galaxies with such n for their outer component are dark matter dominated.
Abstract Copyright: © 2012 The Authors Monthly Notices of the Royal Astronomical Society © 2012 RAS
Journal keyword(s): gravitational lensing: strong - galaxies: fundamental parameters - galaxies: haloes - galaxies: photometry - galaxies: structure - dark matter
Simbad objects: 33
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