Journal
ASTRONOMY & ASTROPHYSICS
Volume 485, Issue 2, Pages 425-433Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20079314
Keywords
galaxies : elliptical and lenticular, cD; galaxies : individual : NGC 1399; galaxies : kinematics and dynamics; galaxies : stellar content; galaxies : nuclei
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In this paper we present for the first time high spatial resolution K-band maps of the central kinematical and near-infrared spectral properties of the giant cD galaxy in the Fornax cluster, NGC1399. We confirm the presence of a central velocity dispersion dip within r <= 0 ''.2 seen in previous long-slit studies. Our velocity dispersion maps give evidence of a non-symmetric structure in this central area by showing three sigma peaks to the north-east, south-east and west of the galaxy centre. Additionally we measure near-IR line strength indices at unprecedented spatial resolution in NGC1399. The most important features we observe in our 2-dimensional line strength maps are drops in Na I and CO(2-0) line strength in the nuclear region of the galaxy, coinciding spatially with the drop in sigma. The observed line strength and velocity dispersion changes suggest a scenario where the centre of NGC1399 harbours a dynamically cold subsystem with a distinct stellar population.
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