Year: 1999
Type: article
Abstract: We investigate the claim by Burkert & Silk that the observed rotation curve of the dwarf irregular galaxy DDO 154 cannot be reconciled with the universal CDM halo profile of Navarro, Frenk & White, even when allowance is made for the effect of violent gas outflow events on the structure of the galaxy. By means of N-body simulations we show that under certain conditions it is possible to obtain a reasonable fit to the observed rotation curve without invoking Burkert & Silk's proposed spheroidal MACHO component. We are able to reproduce the observed decline in the rotation curve best by postulating additional hidden disc mass, in an amount that is compatible with disc stability requirements. In the process we improve upon the results of Navarro, Eke & Frenk on the formation of halo cores by mass-loss by using actual haloes from cold dark matter simulations instead of Hernquist distributions.
Authors: Sergio Gelato, Jesper Sommer-Larsen
Institution: University of Copenhagen
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
Funder: Danmarks Grundforskningsfond
OpenAlex ID: W1964147003