... In particular, with the spectrometer SPI (20 keV-8 MeV), we detect in three observations an emission extending above 200 keV and for the first time even up to 350 keV for a neutron star LMXRB, GS 1826-24. ... The additional component above 200 keV is most probably of non-thermal origin. ... Figure 1. ... We reveal with SPI a hard tail up to 220 keV for 4U 1812-12 (Figure 1) and even up to 350 keV for GS 1826-24 (Figure 2), representing the hardest emission ever detected for a Neutron Star LMXRB. ...

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. ...