A pan-chromatic view of the galaxy cluster XMMU J1230.3+1339 at z=0.975 - Observing the assembly of a massive system
| Autor: | Hernan Quintana, Gabriel W. Pratt, A. Nastasi, Rene Fassbender, J. Kohnert, J. S. Santos, Hans Böhringer, Daniele Pierini, Arjen de Hoon, Manolis Rovilos, R. Suhada, M. Lerchster, Joseph J. Mohr, Axel Schwope, Georg Lamer, Stella Seitz, M. Mühlegger, Gayoung Chon, Piero Rosati |
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| Jazyk: | angličtina |
| Rok vydání: | 2010 |
| Předmět: |
Physics
Cosmology and Nongalactic Astrophysics (astro-ph.CO) Accretion (meteorology) Astrophysics::High Energy Astrophysical Phenomena FOS: Physical sciences Astronomy and Astrophysics Radius Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Galaxy Space and Planetary Science Coma Cluster Cluster (physics) Brightest cluster galaxy Weak gravitational lensing Galaxy cluster Astrophysics::Galaxy Astrophysics Astrophysics - Cosmology and Nongalactic Astrophysics |
| Zdroj: | Astronomy & Astrophysics Artículos CONICYT CONICYT Chile instacron:CONICYT |
| Popis: | We present a comprehensive galaxy cluster study of XMMU J1230.3+1339 based on a joint analysis of X-ray data, optical imaging and spectroscopy observations, weak lensing results, and radio properties for achieving a detailed multi-component view of this newly discovered system at z=0.975. We find an optically very rich and massive system with M200$\simeq$(4.2$\pm$0.8)$\times$10^14 M$\sun$, Tx$\simeq$5.3(+0.7--0.6)keV, and Lx$\simeq$(6.5$\pm$0.7)$\times$10^44 erg/s, for which various widely used mass proxies are measured and compared. We have identified multiple cluster-related components including a central fly-through group close to core passage with associated marginally extended 1.4GHz radio emission possibly originating from the turbulent wake region of the merging event. On the cluster outskirts we see evidence for an on-axis infalling group with a second Brightest Cluster Galaxy (BCG) and indications for an additional off-axis group accretion event. We trace two galaxy filaments beyond the nominal cluster radius and provide a tentative reconstruction of the 3D-accretion geometry of the system. In terms of total mass, ICM structure, optical richness, and the presence of two dominant BCG-type galaxies, the newly confirmed cluster XMMU J1230.3+1339 is likely the progenitor of a system very similar to the local Coma cluster, differing by 7.6 Gyr of structure evolution. 26 pages, 14 color figures, accepted for publication in A&A |
| Databáze: | OpenAIRE |
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