Distant galaxy clusters in a deepXMM-Newtonfield within the CFTHLS D4
| Autor: | Andrea Rabitz, Hans Boeohringer, A. Nastasi, R. Suhada, M. Lerchster, Rene Fassbender, J. S. Santos, Axel Schwope, Piero Rosati, J. P. Dietrich, F. Brimioulle, Daniele Pierini, Martin Muehlegger, Miguel Verdugo, A. Takey, Arjen de Hoon, Georg Lamer, Hernan Quintana |
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| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: |
High Energy Astrophysical Phenomena (astro-ph.HE)
Physics Cosmology and Nongalactic Astrophysics (astro-ph.CO) 010308 nuclear & particles physics Hubble Deep Field Astrophysics::High Energy Astrophysical Phenomena FOS: Physical sciences Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics 01 natural sciences Redshift Cosmology Galaxy Space and Planetary Science 0103 physical sciences Cluster (physics) Surface brightness Astrophysics - High Energy Astrophysical Phenomena 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics Galaxy cluster Astrophysics - Cosmology and Nongalactic Astrophysics Luminosity function (astronomy) |
| Zdroj: | Astronomy & Astrophysics Artículos CONICYT CONICYT Chile instacron:CONICYT |
| Popis: | The XMM-Newton Distant Cluster Project (XDCP) aims at the identification of a well defined sample of X-ray selected clusters of galaxies at redshifts z>0.8. We present a catalogue of the extended sources in one the deepest ~250 ksec XMM-Newton fields targeting LBQS 2215-175 covering the CFHTLS deep field four. The cluster identification is based, among others, on deep imaging with the ESO VLT and from the CFHT legacy survey. The confirmation of cluster candidates is done by VLT/FORS2 multi-object spectroscopy. Photometric redshifts from the CFHTLS D4 are utilized to confirm the effectiveness of the X-ray cluster selection method. The survey sensitivity is computed with extensive simulations. At a flux limit of S(0.5-2.0 keV) ~ 2.5e-15 erg/s we achieve a completeness level higher than 50% in an area of ~0.13 square degrees. We detect six galaxy clusters above this limit with optical counterparts, of which 5 are new spectroscopic discoveries. Two newly discovered X-ray luminous galaxy clusters are at z>1.0, another two at z=0.41 and one at z=0.34. For the most distant X-ray selected cluster in this field at z=1.45 we find additional (active) member galaxies from both X-ray and spectroscopic data. Additionally, we find evidence of large scale structures at moderate redshifts of z=0.41 and z=0.34. The quest for distant clusters in archival XMM-Newton data has led to the detection of six clusters in a single field, making XMM-Newton an outstanding tool for cluster surveys. Three of these clusters are at z>1, which emphasises the valuable contribution of small, yet deep surveys to cosmology. Beta-models are appropriate descriptions for the cluster surface brightness to perform cluster detection simulations in order to compute the X-ray selection function. The constructed logN-logS tends to favour a scenario where no evolution in the cluster X-ray luminosity function (XLF) takes place. Some figures are available in full resolution only in the printed A&A version of the document |
| Databáze: | OpenAIRE |
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