Flat-cored Dark Matter in Cuspy Clusters of Galaxies

The cored distribution of dark matter in spiral galaxies

We present the Hi data for 5 spiral galaxies that, along with their Hα rotation curves, are used to derive the distribution of dark matter within these objects. A new method for extracting rotation curves from Hi data cubes is presented; this takes into account the existence of a warp and minimises projection effects. The rotation curves obtained are tested by taking them as input to construct ...

Dark Matter Profile in Clusters of Galaxies

Using X-ray observation we have obtained the deprojected gas density and temperature profiles for a sample of cluster of galaxies. We show that cool-core clusters, which are expected to be the largest relaxed structures in the universe, have central steep mass density profiles, similar to the cold dark matter density profiles resulting from cosmological N-body simulation. We will present detail...

Dark Matter in Clusters of Galaxies

Cuspy Dark - Matter Halos and the Galaxy

The microlensing optical depth to Baade's Window constrains the minimum total mass in baryonic matter within the Solar circle to be greater than ∼ 3.9×10 10 M ⊙ , assuming the inner Galaxy is barred with viewing angle ∼ 20 •. From the kinematics of solar neighbourhood stars, the local surface density of dark matter is ∼ 30 ± 15 M ⊙ pc −2. We construct cuspy haloes normalised to the local dark m...

Distribution of dark and baryonic matter in clusters of galaxies

We present the analysis of baryonic and non-baryonic matter distribution in a sample of ten nearby clusters (0.03 < z < 0.09) with temperatures between 4.7 and 9.4 keV. These galaxy clusters are studied in detail using X-ray data and global physical properties are determined. Correlations between these quantities are analysed and compared with the results for distant clusters. We find an intere...