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X-ray properties of distant SHARC clusters and cosmological implications

XMM  -Project. X-ray properties of distant SHARC clusters and cosmological implications. Collaborators : D.H. Lumb, J.G. Bartlett (PI) , A.K. Romer, A. Blanchard , D.J. Burke, C.A. Collins, R.C. Nichol, M. Giard, P. Marty, J. Nevalainen, R. Sadat , and S.C. Vauclair (me!) .

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X-ray properties of distant SHARC clusters and cosmological implications

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  1. XMM -Project X-ray properties of distant SHARC clusters and cosmological implications Collaborators : D.H. Lumb, J.G. Bartlett (PI), A.K. Romer, A. Blanchard, D.J. Burke, C.A. Collins, R.C. Nichol, M. Giard, P. Marty, J. Nevalainen, R. Sadat, and S.C. Vauclair (me!). + http://webast.ast.obs-mip.fr/bax (X-ray cluster data base) Palermo 2003

  2. XMM observation of RXJ1120 Z  0.6 Tx=5.45  0.3 keV Lbol=14.4 1044 erg s-1 Arnaud et al, 2002 Lumb et al., 2003, coming soon Palermo 2003

  3. GT observations:  8 clusters with accurate Lx, Tx, Rc, , z... significant fraction of the  high-z SHARC clusters z > 0.45  Goal : L-T relation at high-z, a key ingredient in the number counts calculation. Palermo 2003 D.Lumb et al., 2003

  4. XMM Lx-Tx evolution + local XMM * Chandra Lx/Tx)z = Lx/Tx)z = 0(1+z)with = 0.65  0.28 in full agreement with Chandra (Vikhlinin et al, 2002), and ASCA (Sadat et al., 1998; Novicki et al., 2003....) Palermo 2003

  5. mFrom X-ray Clusters Number counts: => Lx-Tx relation => M-Tx relation + mass function Vauclair et al, 2003,submitted Palermo 2003

  6. Local Normalization 50-60 ROSAT clusters => “Convergence” : Markevitch (1998), Blanchard et al. (2000), Pierpaoli al (2001, 2002), Ikebe et al (2002), Novicki et al (2002) Need redshift evolution study to break the degeneracy between m and 8u Palermo 2003

  7. Surveys used: 5 different flux limited surveys: EMSS, RDCS, B-SHARC, 160 deg2, MACS Modelling with a)high  no free parameters b) Concordance model (=0.7, m=0.3) [models normalized to local counts] 275 clusters with z > 0.3 Palermo 2003

  8. RDCS: 50 deg² fx3. 10-14 erg/s/cm² MACS: 22 000 deg² fx  10-12erg/s/cm² Palermo 2003

  9. Vauclair et al, 2003,submitted Palermo 2003

  10. 160deg² down to z=0with fx>2.10-13 erg/s/cm² Palermo 2003

  11. L-T evolution with redshiftconfirmed by XMM • Strong Evolution in the abundance of x-ray clusters appears from all existing surveys in a fully consistent way • Insensitiveto systematics (L-T, M-T, mass function…) • This provides a strong argument in favor of a high matter density universe. • Relaxing this conclusion will require a major revision of standard scaling of M-T (z) for instance i.e. Tx GM/r Conclusions: Palermo 2003

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