Large scatter in X-ray emission among elliptical galaxies: correlations with mass of host halo
W. G. Mathews, F. Brighenti, A. Faltenbacher, D. A. Buote, P. J. Humphrey, F. Gastaldello, L. Zappacosta
Abstract
The enormous range of X-ray luminosities among elliptical galaxies with similar optical luminosities can be attributed to large scatter and systematic variations in the dark halo mass determined from X-ray observations. The mean halo mass decreases sharply with both the X-ray and K-band luminosities. Smaller halos contain less diffuse hot gas and have lower X-ray luminosities. In addition the hot gas in low mass halos is more easily depleted by supernova-driven outflows, further lowering the X-ray luminosity.
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