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Central K-band kinematics and line strength maps of NGC 1399
In this paper we present for the first time high spatial resolutionK-band maps of the central kinematical and near-infrared spectralproperties of the giant cD galaxy in the Fornax cluster, NGC 1399. Weconfirm the presence of a central velocity dispersion dip within r ≤0.2 arcsec seen in previous long-slit studies. Our velocity dispersionmaps give evidence of a non-symmetric structure in this central area byshowing three σ peaks to the north-east, south-east and west ofthe galaxy centre. Additionally we measure near-IR line strength indicesat unprecedented spatial resolution in NGC 1399. The most importantfeatures we observe in our 2-dimensional line strength maps are drops inNa I and CO (2-0) line strength in the nuclear region of the galaxy,coinciding spatially with the drop in σ. The observed linestrength and velocity dispersion changes suggest a scenario where thecentre of NGC 1399 harbours a dynamically cold subsystem with a distinctstellar population.Based on observation collected at the ESO Paranal La Silla Observatory,Chile, during the Science Verification of SINFONI.
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Наблюдательные данные и астрометрия
| Созвездие: | Большой Пёс |
| Прямое восхождение: | 06h16m59.62s |
| Склонение: | -16°06'09.6" |
| Видимая звёздная величина: | 9.455 |
| Собственное движение RA: | -6.1 |
| Собственное движение Dec: | 15.2 |
| B-T magnitude: | 11.411 |
| V-T magnitude: | 9.617 |
Каталоги и обозначения:
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