In this work we build a detailed dynamic model for an S0 galaxy possibly hosting a central massive dark object (MDO). We show that the photometric profiles and the kinematics along the major and minor axes, including the h(3) and h(4) profiles, imply the presence of a central MDO of mass M(MDO)similar to1.5-9.7x10(8) M-., i.e. 0.3-2.8 per cent of the mass derived for the stellar spheroidal component. Models without MDO are unable to reproduce the kinematic properties of the inner stars and of the rapidly rotating nuclear gas. The stellar population consists of an exponential disc (27 per cent of the light) and a diffuse spheroidal component (73 per cent of the light) that cannot be represented by a simple de Vaucouleurs profile at any radius. The ML ratios we found for the stellar components (3.3 and 6.6 respectively) are typical of those of disc and elliptical galaxies.
Evidence for a massive dark object in NGC 4350
Salucci, Paolo;Danese, Luigi
2001-01-01
Abstract
In this work we build a detailed dynamic model for an S0 galaxy possibly hosting a central massive dark object (MDO). We show that the photometric profiles and the kinematics along the major and minor axes, including the h(3) and h(4) profiles, imply the presence of a central MDO of mass M(MDO)similar to1.5-9.7x10(8) M-., i.e. 0.3-2.8 per cent of the mass derived for the stellar spheroidal component. Models without MDO are unable to reproduce the kinematic properties of the inner stars and of the rapidly rotating nuclear gas. The stellar population consists of an exponential disc (27 per cent of the light) and a diffuse spheroidal component (73 per cent of the light) that cannot be represented by a simple de Vaucouleurs profile at any radius. The ML ratios we found for the stellar components (3.3 and 6.6 respectively) are typical of those of disc and elliptical galaxies.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
