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. Böhringer, L. Conversi, R. Demarco, A. C. Edge, C. Lidman, D. Lutz, L. Metcalfe, C. R. Mullis, I. Pintos-Castro, M. Sánchez-Portal, T. D. Rawle, P. Rosati, A. M. Swinbank, M. Tanaka

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)


Star formation (SF) 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 SF-density relation have been observed in a few z > 1.4 clusters. Using deep imaging from 100-500 μm from Photodetector Array Camera and Spectrometer (PACS) and Spectral and Photometric Imaging REceiver (SPIRE) onboard Herschel, we investigate infrared properties of spectroscopic and photo-z cluster members, and of Ha 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 (SED) in the rest-frame 8-1000 μm. We measure total IR luminosity, deriving star formation rates (SFRs) ranging from 89 to 463M yr-1 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 ± 16Mȯ yr-1. Using a colour 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.

Original languageEnglish
Pages (from-to)1287-1299
Number of pages13
JournalMonthly Notices of the Royal Astronomical Society
Issue number2
Publication statusPublished - Jul 2013
Externally publishedYes


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