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

Joana SantosEuropean Space Astronomy Centre (ESAC)/ESA, Villanueva de la Caada, E-28691 Madrid, SpainB. AltieriEuropean Space Astronomy Centre (ESAC)/ESA, Villanueva de la Cañada, E-28691 Madrid, SpainP. PopessoMax-Planck-Institut fr extraterrestrische Physik, Giessenbachstrae, D-85748 Garching, GermanyV. StrazzulloCEA Saclay, Service d'Astrophysique, L'Orme des Merisiers, Bt. 709, F-91191 Gif-sur-Yvette Cedex, FranceI. ValtchanovEuropean Space Astronomy Centre (ESAC)/ESA, Villanueva de la Caada, E-28691 Madrid, SpainS. BertaMax-Planck-Institut fr extraterrestrische Physik, Giessenbachstrae, D-85748 Garching, GermanyH. BöhringerMax-Planck-Institut für extraterrestrische Physik, Giessenbachstraße, D-85748 Garching, GermanyL. ConversiEuropean Space Astronomy Centre (ESAC)/ESA, Villanueva de la Caada, E-28691 Madrid, SpainR. DemarcoDepartment of Astronomy, Universidad de Concepcion, Casila 160-C, Concepcin, ChileA. C. EdgeDepartment of Physics, Durham University, Durham DH1 3LE, UKC. LidmanAustralian Astronomical Observatory, PO Box 915, North Ryde, NSW 1670, AustraliaD. LutzMax-Planck-Institut fr extraterrestrische Physik, Giessenbachstrae, D-85748 Garching, GermanyL. MetcalfeEuropean Space Astronomy Centre (ESAC)/ESA, Villanueva de la Caada, E-28691 Madrid, SpainC. R. MullisIrene Pintos-CastroInstituto de Astrofísica de Canarias, La Laguna, Tenerife, SpainM. Sánchez-PortalEuropean Space Astronomy Centre (ESAC)/ESA, Villanueva de la Cañada, E-28691 Madrid, SpainTim RawleEuropean Space Astronomy Centre (ESAC)/ESA, Villanueva de la Caada, E-28691 Madrid, SpainP. RosatiEuropean Southern Observatory (ESO), Garching, GermanyA. M. SwinbankDepartment of Physics, Durham University, Durham DH1 3LE, UKM. TanakaInstitute for the Physics and Mathematics of the Universe, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa-shi, Chiba 277-8583, Japan

2013en

ABI

Аннотация

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 m 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 H 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 m. 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.

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DOI: 10.1093/mnras/stt811

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