The reversal of the SF-density relation in a massive, X-ray selected galaxy cluster at z=1.58: results from Herschel
| Autor: | Santos, Joana S., Altieri, . Bruno, Valtchanov, Ivan, Nastasi, Alessandro, Böhringer, Hans, Cresci, Giovanni, Elbaz, David, Fassbender, Rene, Rosati, Piero, Tozzi, Paolo, Verdugo, Miguel |
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| Rok vydání: | 2014 |
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| Druh dokumentu: | Working Paper |
| DOI: | 10.1093/mnrasl/slu180 |
| Popis: | Dusty, star-forming galaxies have a critical role in the formation and evolution of massive galaxies in the Universe. Using deep far-infrared imaging in the range 100-500um obtained with the Herschel telescope, we investigate the dust-obscured star formation in the galaxy cluster XDCP J0044.0-2033 at z=1.58, the most massive cluster at z >1.5, with a measured mass M200= 4.7x10$^{14}$ Msun. We perform an analysis of the spectral energy distributions (SEDs) of 12 cluster members (5 spectroscopically confirmed) detected with >3$\sigma$ significance in the PACS maps, all ULIRGs. The individual star formation rates (SFRs) lie in the range 155-824 Ms/yr, with dust temperatures of 24$\pm$35 K. We measure a strikingly high amount of star formation (SF) in the cluster core, SFR (< 250 kpc) > 1875$\pm$158 Ms/yr, 4x higher than the amount of star formation in the cluster outskirts. This scenario is unprecedented in a galaxy cluster, showing for the first time a reversal of the SF-density relation at z~1.6 in a massive cluster. Comment: Letter accepted for publication in MNRAS, ESA Press Release on 18 December 2014 |
| Databáze: | arXiv |
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