TY - JOUR
T1 - Dust-obscured star formation in the outskirts of XMMU J2235.3-2557, a massive galaxy cluster at z = 1.4
AU - Santos, J. S.
AU - Altieri, B.
AU - Popesso, P.
AU - Strazzullo, V.
AU - Valtchanov, I.
AU - Berta, S.
AU - Böhringer, H.
AU - Conversi, L.
AU - Demarco, R.
AU - Edge, A. C.
AU - Lidman, C.
AU - Lutz, D.
AU - Metcalfe, L.
AU - Mullis, C. R.
AU - Pintos-Castro, I.
AU - Sánchez-Portal, M.
AU - Rawle, T. D.
AU - Rosati, P.
AU - Swinbank, A. M.
AU - Tanaka, M.
PY - 2013/7
Y1 - 2013/7
N2 - 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.
AB - 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.
KW - Galaxies:Star formation
KW - Glaxies:Clusters:Individual:XMMU J2235.3-2557-Galaxies:High
KW - Infrared:Galaxies
KW - Redshift
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U2 - 10.1093/mnras/stt811
DO - 10.1093/mnras/stt811
M3 - Article
AN - SCOPUS:84880975589
SN - 0035-8711
VL - 433
SP - 1287
EP - 1299
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 2
ER -