Maqola

The discovery of a massive supercluster at <b> <i>z</i>= 0.9</b> in the UKIDSS Deep eXtragalactic Survey

A. M. SwinbankDepartment of Physics, Institute for Computational Cosmology, Durham University, South Road, Durham DH1 3LEA. C. EdgeDepartment of Physics, Institute for Computational Cosmology, Durham University, South Road, Durham DH1 3LEIan SmailDepartment of Physics, Institute for Computational Cosmology, Durham University, South Road, Durham DH1 3LEJ. P. StottDepartment of Physics, Institute for Computational Cosmology, Durham University, South Road, Durham DH1 3LEL. PozzettiH.H. Wills Physics Laboratory, University of Bristol, Bristol BS8 1TLYasunori SatoNational Astronomical Observatory of Japan, 2-21-1, Osawa, Mitaka, Tokyo 181-8588, JapanCaroline van BreukelenM. J. JarvisCentre for Astrophysics, Science & Technology Research Institute, University of Hertfordshire, Hatfield, Herts AL10 9ABI. WaddingtonDepartment of Physics and Astronomy, Astronomy Centre, University of Sussex, Brighton BN1 9QHL. ClewleyJ. BergeronInstitut d'Astrophysique de Paris, CNRS, 98 bis Bd., Arago, 75014 Paris, FranceGarret CotterDepartment of Physics and Astronomy, Astronomy Centre, University of Sussex, Brighton BN1 9QHS. DyeSchool of Physics & Astronomy, Cardiff University, Queens Buildings, The Parade, Cardiff CF24 3AAJ. E. GeachDepartment of Physics, Institute for Computational Cosmology, Durham University, South Road, Durham DH1 3LEE. González-SolaresInstitute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HAPaul HirstGemini Observatory, 670 North A'ohoku Place, Hilo, HI 96720, USAR. J. IvisonInstitute for Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJSteve RawlingsChris SimpsonAstrophysics Research Institute, Liverpool John Moores University, Twelve Quays House, Egereton Wharf, Birkenhead CH4 1LDG. P. SmithSchool of Physics and Astronomy, University of Birmingham, Birmingham, Edgebaston B15 2TTA. VermaMax-Planck-Institut fr extraterrestrische Physik, Garching D-85741, GermanyTōru Yamada

2007en

ABI

Annotatsiya

Abstract We analyse the first publicly released deep field of the UK Infrared Deep Sky Survey (UKIDSS) Deep eXtragalactic Survey to identify candidate galaxy overdensities at z∼ 1 across ∼1 deg2 in the ELAIS-N1 field. Using I−K, J−K and K− 3.6 μm colours, we identify and spectroscopically follow up five candidate structures with Gemini/Gemini Multi-Object Spectrograph and confirm that they are all true overdensities with between five and 19 members each. Surprisingly, all five structures lie in a narrow redshift range at z= 0.89 ± 0.01, although they are spread across 30 Mpc on the sky. We also find a more distant overdensity at z= 1.09 in one of the spectroscopic survey regions. These five overdense regions lying in a narrow redshift range indicate the presence of a supercluster in this field and by comparing with mock cluster catalogues from N-body simulations we discuss the likely properties of this structure. Overall, we show that the properties of this supercluster are similar to the well-studied Shapley and Hercules superclusters at lower redshift.

Hali tarjima qilinmagan

Identifikatorlar

DOI: 10.1111/j.1365-2966.2007.12037.x

Iqtiboslar va manbalar

2 ta iqtibos0 ta foydalanilgan manba

Koʻrsatkichlar — AkademScholar