The reversal of the SF-density relation in a massive, X-ray-selected galaxy cluster at z = 1.58: results from Herschel

Autor(en)

J. S. Santos, Bruno Altieri, Ivan Valtchanov, A. Nastasi, G. Cresci, Miguel Anibal Verdugo Olivares

Abstrakt

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(en)

Institut für Astrophysik

Externe Organisation(en)

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

Band

447

Seiten

L65 - L69

ISSN

0035-8711

Publikationsdatum

02-2015

Peer-reviewed

Ja

ÖFOS 2012

103003 Astronomie, 103004 Astrophysik

Link zum Portal

https://ucrisportal.univie.ac.at/de/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