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http://hdl.handle.net/20.500.12386/24229
Titolo: | The reversal of the SF-density relation in a massive, X-ray-selected galaxy cluster at z = 1.58: results from Herschel | Autori: | Santos, J. S. Altieri, B. Valtchanov, I. Nastasi, A. Bohringer, H. CRESCI, GIOVANNI Elbaz, D. Fassbender, R. Rosati, P. TOZZI, Paolo Verdugo, M. |
Data pubblicazione: | 2015 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Numero: | 447 | Da pagina:: | L65 | Abstract: | 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 100-500 μm obtained with the Herschel telescope, we investigate the dust-obscured star formation (SF) in the galaxy cluster XDCP J0044.0-2033 at z = 1.58, the most massive cluster at z > 1.5, with a measured mass M<SUB>200</SUB> = 4.7^{+1.4}_{-0.9} × 10<SUP>14</SUP> M<SUB>☉</SUB>. We perform an analysis of the spectral energy distributions (SEDs) of 12 cluster members (5 spectroscopically confirmed) detected with ≥3σ significance in the PACS maps, all ultraluminous infrared galaxies. The individual star formation rates (SFRs) lie in the range 155-824 M<SUB>☉</SUB> yr<SUP>-1</SUP>, with dust temperatures of 24-35 K. We measure a strikingly high amount of SF in the cluster core, SFR (<250 kpc) ≥ 1875 ± 158 M<SUB>☉</SUB> yr<SUP>-1</SUP>, four times higher than the amount of SF 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. | Acknowledgments: | JSS and RF acknowledge funding from the European Union Seventh Framework Programme (FP7/2007-2013) under grant agreement no. 267251 ‘Astronomy Fellowships in Italy’ (AstroFIt). PACS has been developed by a consortium of institutes led by MPE (Germany) and including UVIE (Austria); KUL, CSL, IMEC (Belgium); CEA, OAMP (France); MPIA (Germany); IFSI, OAP/AOT, OAA/CAISMI, LENS, SISSA (Italy); IAC (Spain). This development has been supported by the funding agencies BMVIT (Austria), ESA-PRODEX (Belgium), CEA/CNES (France), DLR (Germany), ASI (Italy) and CICYT/MCYT (Spain). SPIRE has been developed by a consortium of institutes led by Cardiff University (UK) and including University of Lethbridge (Canada); NAOC (China); CEA, LAM (France); IFSI, University of Padua (Italy); IAC (Spain); Stockholm Observatory (Sweden); Imperial College London, RAL, UCL-MSSL, UK ATC, University of Sussex, STFC, UKSA (UK); Caltech, JPL, NHSC, University of Colorado (USA). This development has been supported by national funding agencies: CSA (Canada); NAOC (China); CEA, CNES, CNRS (France); ASI (Italy); MCINN (Spain); SNSB (Sweden); and NASA (USA). PT acknowledges funding from contract PRIN INAF 2012 (‘A unique data set to address the most compelling open questions about X-ray galaxy clusters’). | URI: | http://hdl.handle.net/20.500.12386/24229 | URL: | https://academic.oup.com/mnrasl/article/447/1/L65/1041248 | ISSN: | 0035-8711 | DOI: | 10.1093/mnrasl/slu180 | Bibcode ADS: | 2015MNRAS.447L..65S | Fulltext: | open |
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