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Using globular cluster (GC) kinematics and photometry data, we calibrate thescaling relation between the total galaxy mass (M_TOT including dark matter)and total globular cluster system mass (M_GCS) in a sample of 30 early-typegalaxies (ETG), confirming a nearly linear relationship between the twophysical parameters. Using samples of 83 and 57 ETGs, we investigate thisscaling relation in conjunction with the previously known relations betweenM_TOT and the ISM X-ray luminosity and temperature, respectively. We confirmthat M_GCS can be effectively used as a proxy of M_TOT. We further find thatthe L_X,GAS - M_TOT relation is far tighter in the subsample of core ETGs, whencompared to cusp ETGs. In core ETGs (old, passively evolving stellar systems)M_TOT is significantly larger than the total stellar mass M_STAR and thecorrelation with the hot gas properties is driven by their dark matter massM_DM. Cusp ETGs have typically lower LX,GAS than core ETGs. In cusp ETGs, for agiven M_DM, higher L_X,GAS is associated with higher M_STAR, suggesting stellarfeedback as an important secondary factor for heating the ISM. Using the M_GCS-M_TOT scaling relations we compare 272 ETGs with previous estimates of thestellar-to-halo mass relation of galaxies. Our model-independent estimate ofM_TOT results in a good agreement around halo masses of 10^12 Mo, but suggesthigher star formation efficiency than usually assumed both at the low and atthe high halo mass ends.

monthly notices of the royal astronomical society

Revisiting the X-ray - Mass scaling relations of Early-type Galaxies  with the Mass of their Globular Cluster Systems as a Proxy for the Total  Galaxy Mass