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

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 f...

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Bibliographic Details
Published in:Monthly notices of the Royal Astronomical Society 2013-08, Vol.433 (2), p.1287-1299
Main Authors: Santos, J. S., Altieri, B., Popesso, P., Strazzullo, V., Valtchanov, I., Berta, S., Böhringer, H., Conversi, L., Demarco, R., Edge, A. C., Lidman, C., Lutz, D., Metcalfe, L., Mullis, C.R., Pintos-Castro, I., Sánchez-Portal, M., Rawle, T. D., Rosati, P., Swinbank, A. M., Tanaka, M.
Format: Article
Language:English
Subjects:
Red shift
Star & galaxy formation
X-ray astronomy
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Summary: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 Hα 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 463 M 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 ± 16 M 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.
ISSN:0035-8711
1365-2966
DOI:10.1093/mnras/stt811