X-ray Scaling Relations of core and coreless E and S0 Galaxies

Understand

We have re-examined the two X-ray scaling relations of early-type galaxies (ETGs), Lx - LK and Lx - T, using 61 ATLAS3D E and S0 galaxies observed with Chandra.

• The larger sample allows us to investigate the effect of structural and dynamical properties of ETGs in these relations.
• Using the sub-sample of genuine E galaxies with central surface brightness cores, slow stellar rotations and old stellar populations, we find that the scatter of the correlations is strongly reduced, yielding an extremely tight relation.
• For the gas-rich galaxies in this sample, this relation is consistent with recent simulations.