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

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.

Abstract

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.

Citation

Santos, J., Altieri, B., Popesso, P., Strazzullo, V., Valtchanov, I., Berta, S., …Tanaka, M. (2013). Dust-obscured star formation in the outskirts of XMMU J2235.3-2557, a massive galaxy cluster at z = 1.4. Monthly Notices of the Royal Astronomical Society, 433(2), 1287-1299. https://doi.org/10.1093/mnras/stt811

• Journal Article Type: Article
• Publication Date: Jan 1, 2013
• Deposit Date: Aug 23, 2013
• Publicly Available Date: Sep 4, 2013
• Journal: Monthly Notices of the Royal Astronomical Society
• Print ISSN: 0035-8711
• Electronic ISSN: 1365-2966
• Publisher: Royal Astronomical Society
• Peer Reviewed: Peer Reviewed
• Volume: 433
• Issue: 2
• Pages: 1287-1299
• DOI: https://doi.org/10.1093/mnras/stt811
• Keywords: Galaxies, Clusters, XMMU J2235.3-2557, High-redshift, Star formation, Infrared.
• Public URL: https://durham-repository.worktribe.com/output/1448794