NEW RESULTS ON OPTICAL IDENTIFICATIONS OF INTEGRAL SOURCES N. Masetti1 , L. Morelli2 , E. Palazzi1 , G. Galaz2 , L. Bassani1 , A. Bazzano3 , A.J. Bird4 , A.J. Dean4 , G.L. Israel5 , R. Landi1 ... Italy 4 5 University of Southampton, Southampton, United Kingdom 6 INAF-Osservatorio Astronomico di Roma, Monteporzio Catone, Italy INTEGRAL Science Data Centre, Versoix, Switzerland ABSTRACT Optical spectroscopic identification of the nature of 21 unidentified southern hard X­ ...

Lack of co oling flow clusters at z 0.5 A. Vikhlinin1,2 , R. Burenin2 , W. R. Forman1 , C. Jones1 , A. Hornstrup3 , S. S. Murray1, and H. Quintana4 1 2 3 4 Harvard-Smithsonian ... Astronomia y Astrofisica, Pontificia Universidad Catolica de Chile The goal of this work is to study the incidence rate of co oling flows in the high redshift clusters using Chandra observations of z 0.5 ob jects from a new large, ... Fig. ... Lack of "cooling flow" clusters at z > 0.5 3 Fig. ...