Bibcode
Prugniel, Ph.; Zeilinger, W.; Koleva, M.; de Rijcke, S.
Referencia bibliográfica
Astronomy and Astrophysics, Volume 528, id.A128
Fecha de publicación:
4
2011
Revista
Número de citas
9
Número de citas referidas
8
Descripción
Context. NGC 4486A is a low-luminosity elliptical galaxy harbouring an
edge-on nuclear disk of stars and dust. It is known to host a
super-massive black hole. Aims: We study its large-scale
kinematics and stellar population along the major axis to investigate
the link between the nuclear and global properties. Methods: We
use long-slit medium-resolution optical spectra that we fit against
stellar population models. Results: The SSP-equivalent age is
about 12 Gyr old throughout the body of the galaxy, and its metallicity
decreases from [Fe/H] = 0.18 near the centre to sub-solar values in the
outskirts. The metallicity gradient is -0.24 dex per decade of radius
within the effective isophote. The velocity dispersion is 132 ± 3
km s-1 at 1.3″ from the centre and decreases outwards.
The rotation velocity reaches a maximum Vmax gtrapprox
115±5 km s-1 at a radius 1.3 <
rmax < 2″. Conclusions: NGC 4486A appears to
be a typical low-luminosity elliptical galaxy. There is no signature in
the stellar population of the possible ancient accretion/merging event
that produced the disk.
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