The reversal of the SF-density relation in a massive, X-ray-selected galaxy cluster at z = 1.58: results from Herschel
- Author(s)
- J. S. Santos, Bruno Altieri, Ivan Valtchanov, A. Nastasi, G. Cresci, Miguel Anibal Verdugo Olivares
- 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 M200 = 4.7^{+1.4}_{-0.9} × 1014 M⊙. 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⊙ yr-1, 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⊙ yr-1, 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.
- Organisation(s)
- Department of Astrophysics
- External organisation(s)
- Institute d'Astrophysique Spatiale - IAS, Max-Planck-Institut für extraterrestrische Physik, INAF - Osservatorio Astrofisico di Arcetri, European Space Astronomy Centre (ESA), European Space Agency (ESA)
- Journal
- Monthly Notices of the Royal Astronomical Society
- Volume
- 447
- Pages
- L65 - L69
- ISSN
- 0035-8711
- Publication date
- 02-2015
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 103003 Astronomy, 103004 Astrophysics
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/the-reversal-of-the-sfdensity-relation-in-a-massive-xrayselected-galaxy-cluster-at-z--158-results-from-herschel(816198a2-9286-4e3b-8b12-040cc2859ed2).html