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- W4230910523 abstract "We present absorption line profile analysis of NGC 474, an elliptical with prominent, irregular shells. Profiles are parameterized with Gauss-Hermite polynomials (van der Marel & Franx ApJ 407 1993; Rix & White MNRAS 254 1992). The fastest rotation (∼ 50 km s –1 ) and steepest central velocity gradient along the intermediate photometric axis rules out the possibility that NGC 474 is a face-on S0 (Schombert & Wallin AJ 94 1987) and suggests that it is triaxial. The asymmetry of the LOSVDs ( h 3 up to 0.08) indicates the presence of a subsystem with rapid, ordered rotation. The minor axis velocity curve shows a kinematic feature at 3–4″ east of the nucleus, with no associated h 3 or h 4 features. Non-parametric LOSVD analysis (unresolved Gaussian decomposition, Kuijken & Merrifield MNRAS 264 1993) reveals a double-peaked profile at that location. In all position angles line-profiles are distinctly pointy for radii up to 2″, and are consistent with zero further out. We have found similar central positive h 4 terms in the shell galaxy NGC 2865 (Hau et al. MNRAS in prep ). Cores with pointy LOSVDs are uncommon in ellipticals (Bender, Saglia & Gerhard MNRAS 269 1994). Positive h 4 terms might contain important clues on the shell-formation mechanism in ellipticals." @default.
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- W4230910523 date "1996-01-01" @default.
- W4230910523 modified "2023-09-25" @default.
- W4230910523 title "Peculiar Kinematics in the Core of NGC 474" @default.
- W4230910523 doi "https://doi.org/10.1017/s007418090023307x" @default.
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