The Morphology-Density-Relation: Impact on the Satellite Fraction

Understand

In the past years several authors studied the abundance of satellites around galaxies in order to better estimate the halo masses of host galaxies.

• To investigate this connection, we analyze galaxies with $M_\mathrm{star}\geq\,10^{10}\,M_{\odot}$ from the hydrodynamical cosmological simulation Magneticum.
• We find that the satellite fraction of centrals is independent of their morphology.
• With the exception of very massive galaxies at low redshift, our results do not support the assumption that the dark matter (DM) haloes of spheroidal galaxies are significantly more massive than those of disc galaxies at fixed $M_\mathrm{star}$.