Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-08-04
Astronomy and Astrophysics
Astrophysics
11 pages, 8 figures, accepted for pubblication on MNRAS
Scientific paper
10.1111/j.1365-2966.2004.08236.x
We present the detection of nuclear stellar discs in the low-luminosity elliptical galaxies NGC 4458 and NGC 4478, which are known to host a kinematically-decoupled core. Using archival HST imaging, and available absorption line-strength index data based on ground-based spectroscopy, we investigate the photometric parameters and the properties of the stellar populations of these central structures. Their scale length, h, and face-on central surface brightness, mu_0^c, fit on mu_0^c-h relation for galaxy discs. For NGC 4458 these parameters are typical for nuclear discs, while the same quantities for NGC 4478 lie between those of nuclear discs and the discs of discy ellipticals. We present Lick/IDS absorption line-strength measurements of Hbeta, Mgb,
Bender Ralf
Bertola Francesco
Birkinshaw Mark
Corsini Enrico Maria
Davies Roger L.
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