The impact of cooling flows on the TX–LBol relation for the most luminous clusters |
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| Authors: | S W Allen & A C Fabian |
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| Institution: | Institute of Astronomy, Madingley Road, Cambridge CB3 0HA |
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| Abstract: | We examine the effects of cooling flows on the T X– L Bol relation for a sample of the most X-ray luminous ( L Bol > 1045 erg s−1) clusters of galaxies known. Using high-quality ASCA X-ray spectra and ROSAT images we explicitly account for the effects of cooling flows on the X-ray properties of the clusters and show that this reduces the previously noted dispersion in the T X– L Bol relationship. More importantly, the slope of the relationship is flattened from L Bol ∝ T 3X to approximately L Bol ∝ T 2X, in agreement with recent theoretical models which include the effects of shocks and pre-heating on the X-ray gas. We find no evidence for evolution in the T X– L Bol relation within z ∼ 0.3. Our results demonstrate that the effects of cooling flows must be accounted for before cosmological parameters can be determined from X-ray observations of clusters. The results presented here should provide a reliable basis for modelling the T X– L Bol relation at high X-ray luminosities. |
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| Keywords: | galaxies: clusters: general cooling flows intergalactic medium X-rays: galaxies |
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