Query : 2016A&A...587A.111A

2016A&A...587A.111A - Astronomy and Astrophysics, volume 587A, 111-111 (2016/3-1)

Early-type dwarf galaxies with multicomponent stellar structure: Are they remnants of disc galaxies strongly transformed by their environment?


Abstract (from CDS):

The surface brightness distribution of ∼30-40% of the early-type dwarf galaxies with -18≤MB≤-15 in the Virgo and the Coma clusters is fitted by models that include two structural components (Sersic + exponential) as for bright disc galaxies. The goal of the present study is to determine whether early-type dwarf galaxies with a two-component stellar structure in the Virgo and the Coma clusters are low-luminosity copies of bright disc galaxies or are the remnants of bright galaxies strongly transformed by cluster environmental effects. I analysed the location of bright disc galaxies and early-type dwarfs in the rb,e/h- n plane. The location in this plane of the two-component dwarf galaxies was compared with the remnants of tidally disrupted disc galaxies reported by numerical simulations. Bright unbarred disc galaxies show a strong correlation in the rb,e/h-n plane. Galaxies with larger Sersic shape parameters show a higher rb,e/h ratio. In contrast, two-component early-type dwarf galaxies do not follow the same correlation. A fraction (∼55%) of them are located outside the locus defined in this plane by having 95% of bright disc galaxies. This distribution indicates that they are not a low-mass replica of bright disc galaxies. The different location in the rb,e/h- n plane of two-component early-type dwarfs and bright galaxies can be qualitatively explain whether the former are remnants of disc galaxies strongly transformed by tidal processes. The progenitors of ∼20-25% of early-type dwarf galaxies with -18≤MB≤-15 in the Virgo and Coma clusters could be bright disc galaxies transformed by effects of the environment. These tidally transformed galaxies can be selected according to their location in the rb,e/h-n plane.

Abstract Copyright:

Journal keyword(s): galaxies: clusters: general - galaxies: dwarf - galaxies: evolution

Simbad objects: 2

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Number of rows : 2
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
1 NAME Vir I ClG 12 26 32.1 +12 43 24   10.00 8.49     ~ 6087 0
2 ACO 1656 ClG 12 59 48.7 +27 58 50           ~ 4388 2

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