SIMBAD references

We compare the empirical relationships between the mass of a galaxy's globular cluster system (GCS) M_GCS, the gas mass in the hot X-ray atmosphere M_X within a fiducial radius of 5r_e, the total gravitational mass M_grav within 5r_e, and lastly the total halo mass M_h calibrated from weak lensing. We use a sample of 45 early-type galaxies for which both GCS and X-ray data are available; all the galaxies in our sample are relatively high-mass with M_h > 10¹²M_☉. We find that M_X∝M_h^1.0, similar to the previously known scaling relation M_GCS∝M_h^1.0. Both components scale much more steeply than the more well known dependence of total stellar mass M_*∝M_h^0.3 for luminous galaxies. These results strengthen previous suggestions that feedback had little effect on formation of the GCS. The current data are also used to measure the relative mass fractions of baryonic matter and dark matter within 5r_e. We find a strikingly uniform mean of <f_DM>=0.83 with few outliers and an rms scatter of ±0.07. This result is in good agreement with two recent suites of hydrodynamic galaxy formation models.