088027

We propose to observe five X-ray-faint genuine elliptical galaxies openParfor 150 ksecclosePar. The observed tight correlation between Lx and T for a small sample of E galaxies suggests that the retention of hot gas openParpotential depthclosePar and the balance between heating and cooling is closely regulated. The available data suggest that the tight relation may extend down to logopenParLxcloseParvirgul38.5. However comma theoretical predictions and numerical simulations suggest that the gas is in an outflow-wind state at these Lx comma predicting an end to the correlation. We propose to constrain observationally the Lx-T relation at the lowest Lx to test the most substantial effect of the baryonic physics and provide the necessary confirmation of feedback recipes or the need for their corrections.