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          Institute: MPI für extraterrestrische Physik     Collection: High Energy Astrophysics at MPE     Display Documents

ID: 12571.0, MPI für extraterrestrische Physik / High Energy Astrophysics at MPE
XMM-Newton observation of a distant X-ray selected cluster of galaxies at z=1.26 with possible cluster interaction
Authors:Hashimoto, Yasuhiro; Hasinger, Günther; Arnaud, Monique; Rosati, Piero; Miyaji, Takamitsu
Date of Publication (YYYY-MM-DD):2002-01
Title of Journal:Astronomy & Astrophysics
Journal Abbrev.:Astron. Astrophys.
Issue / Number:3
Start Page:841
End Page:847
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:We report on the XMM-Newton observation of RX J1053.7+5735, one of the most distant (z = 1.26) X-ray selected clusters of galaxies, which also shows an unusual double-lobed X-ray morphology, indicative of possible cluster-cluster interaction. The cluster was discovered during our ROSAT deep pointings in the direction of the Lockman Hole. The XMM-Newton observations were performed with the European Photon Imaging Camera (EPIC) during the performance verification phase. Total effective exposure time was similar to 100 ksec. The best fit temperature based on a simultaneous fit of spectra from all EPIC cameras (pn+MOS) is 4.9(-0.9)(+1.5) keV. Metallicity is poorly constrained even using the joint fit of all spectra, with an upper limit on the iron abundance of 0.62 solar. Using the best fit model parameters, we derived an unabsorbed (0.2-10) keV flux of f(0.2-10) = 3.0 x 10(14) erg cm(-2) s(-1), corresponding to a bolometric luminosity of L-bol = 3.4 x 10(44) h(50)(-2) erg s(-1). Despite the fact that it was observed at fairly large off-axis angle, the temperature errors are much smaller compared with those of typical measurements based on ASCA or Beppo-Sax observations of high-z (z >0.6) clusters, demonstrating the power of the XMM for determining the X-ray temperature for high-z clusters. The measured temperature and luminosity show that one can easily reach the intrinsically X-ray faint and cool cluster regime comparable with those of z similar to 0.4 clusters observed by past satellites. The new cluster temperature and L-bol we have measured for RX J1053.7+5735 is consistent with a weak/no evolution of the L-bol-T-x relation out to z similar to 1.3, which lends support to a low Omega(m) universe, although more data-points of z >1 clusters are required for a more definitive statement. The caution has to be also exercised in interpreting the result, because of the uncertainty associated with the dynamical status of this cluster.
Free Keywords:galaxies : clusters : general; X-rays : galaxies; galaxies : evolution
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für extraterrestrische Physik
External Affiliations:Astrophys Inst Potsdam, Sternwarte 16, D-14482 Potsdam, Germany; Astrophys Inst Potsdam, D-14482 Potsdam, Germany; Max Planck Inst Extraterr Phys, D-85748 Garching, Germany; CEA Saclay, Serv Astrophys, F-91191 Gif Sur Yvette, France; European So Observ, D-85748 Garching, Germany; Carnegie Mellon Univ, Dept Phys, Pittsburgh, PA 15213 USA
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