Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-10-24
Astrophys.J.652:L17-L20,2006
Astronomy and Astrophysics
Astrophysics
6 pages, 2 figures, accepted by ApJ Letters
Scientific paper
10.1086/509915
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.
Brighenti Fabrizio
Buote David A.
Faltenbacher Aandreas
Gastaldello Fabio
Humphrey Philip J.
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