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M McDonald M Bayliss BA Benson RJ Foley J Ruel P Sullivan S Veilleux KA Aird ML Ashby M Bautz G Bazin LE Bleem M Brodwin JE Carlstrom CL Chang HM Cho A Clocchiatti TM Crawford AT Crites T de Haan S Desai MA Dobbs JP Dudley E Egami WR Forman GP Garmire EM George MD Gladders AH Gonzalez NW Halverson NL Harrington FW High GP Holder WL Holzapfel S Hoover JD Hrubes C Jones M Joy R Keisler L Knox AT Lee EM Leitch J Liu M Lueker D Luong-Van A Mantz DP Marrone JJ McMahon J Mehl SS Meyer ED Miller 《Nature》2012,488(7411):349-352
In the cores of some clusters of galaxies the hot intracluster plasma is dense enough that it should cool radiatively in the cluster's lifetime, leading to continuous 'cooling flows' of gas sinking towards the cluster centre, yet no such cooling flow has been observed. The low observed star-formation rates and cool gas masses for these 'cool-core' clusters suggest that much of the cooling must be offset by feedback to prevent the formation of a runaway cooling flow. Here we report X-ray, optical and infrared observations of the galaxy cluster SPT-CLJ2344-4243 (ref. 11) at redshift z = 0.596. These observations reveal an exceptionally luminous (8.2?×?10(45)?erg?s(-1)) galaxy cluster that hosts an extremely strong cooling flow (around 3,820 solar masses a year). Further, the central galaxy in this cluster appears to be experiencing a massive starburst (formation of around 740 solar masses a year), which suggests that the feedback source responsible for preventing runaway cooling in nearby cool-core clusters may not yet be fully established in SPT-CLJ2344-4243. This large star-formation rate implies that a significant fraction of the stars in the central galaxy of this cluster may form through accretion of the intracluster medium, rather than (as is currently thought) assembling entirely via mergers. 相似文献
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