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arXiv · 1305.1938

Dust-obscured star-formation in the outskirts of XMMU J2235.3-2557, a massive galaxy cluster at z=1.4

J. S. Santos·B. Altieri·P. Popesso·V. Strazzullo·I. Valtchanov·S. Berta·H. Bohringer·L. Conversi·R. Demarco·A. C. Edge·C. Lidman·D. Lutz·L. Metcalfe·C. R. Mullis·I. Pintos-Castro·M. Sanchez-Portal·T. D. Rawle·P. Rosati·A. M. Swinbank·M. Tanaka
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Abstract

Star-formation in the galaxy populations of local massive clusters is reduced with respect to field galaxies, and tends to be suppressed in the core region. Indications of a reversal of the star-formation--density relation have been observed in a few z >1.4 clusters. Using deep imaging from 100-500um from PACS and SPIRE onboard Herschel, we investigate the infrared properties of spectroscopic and photo-z cluster members, and of Halpha emitters in XMMU J2235.3-2557, one of the most massive, distant, X-ray selected clusters known. Our analysis is based mostly on fitting of the galaxies spectral energy distribution in the rest-frame 8-1000um. We measure total IR luminosity, deriving star formation rates (SFRs) ranging from 89-463 Msun/yr for 13 galaxies individually detected by Herschel, all located beyond the core region (r >250 kpc). We perform a stacking analysis of nine star-forming members not detected by PACS, yielding a detection with SFR=48 Msun/yr. Using a color criterion based on a star-forming galaxy SED at the cluster redshift we select 41 PACS sources as candidate star-forming cluster members. We characterize a population of highly obscured SF galaxies in the outskirts of XMMU J2235.3-2557. We do not find evidence for a reversal of the SF-density relation in this massive, distant cluster.

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J. S. Santos, B. Altieri, P. Popesso, V. Strazzullo, I. Valtchanov, S. Berta, H. Bohringer, L. Conversi, R. Demarco, A. C. Edge, C. Lidman, D. Lutz, L. Metcalfe, C. R. Mullis, I. Pintos-Castro, M. Sanchez-Portal, T. D. Rawle, P. Rosati, A. M. Swinbank, M. Tanaka. 2013-05-08. Dust-obscured star-formation in the outskirts of XMMU J2235.3-2557, a massive galaxy cluster at z=1.4. https://doi.org/10.1093/mnras%2Fstt811

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