Browsing by Author "Balcells, M"

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    The shell elliptical galaxy NGC 2865: evolutionary population synthesis of a kinematically distinct core
    (1999) Hau, GKT; Carter, D; Balcells, M
    We report on the discovery of a rapidly corotating stellar and gas component in the nucleus of the shell elliptical NGC 2865. The stellar component extends similar to 0.51 h(100)(-1) kpc along the major axis, and shows depressed velocity dispersion and absorption-line profiles skewed in the opposite sense to the mean velocity. Associated with it is a young stellar population with enhanced H beta, lowered Mg, and the same Fe indices relative to the underlying elliptical. Its recent star formation history is constrained by considering 'bulge+burst' models under four physically motivated scenarios, using evolutionary population synthesis. Scenarios in which the nuclear component is formed over a Hubble time or recently from continuous gas inflow are ruled out.